{"currentpage":1,"firstResult":0,"maxresult":10,"pagecode":5,"pageindex":{"endPagecode":5,"startPagecode":1},"records":[{"abstractinfo":"通过试验确定了复合轧制温度等工艺参数,计算了Ti-Zr-Mo(TZM)板累积轧制复合过程变形抗力及轧制力,并对累积复合轧制过程各道次TZM复合板进行了性能测试和组织分析.结果表明:经过三次累积复合的材料抗拉强度和界面结合状态最佳,随累积变形量的增加,复合板晶粒显著细化,晶粒断面直径200 ~500 nm,晶粒在轧制过程中被拉长、展宽,轧制横断面上组织分布均匀化.轧制复合工艺可使TZM板材抗拉强度提高50%,2 mmTZM复合板最高抗拉强度可达968 MPa,伸长率2.0%.","authors":[{"authorName":"王华","id":"8fdd870f-5436-4f3b-9ed8-93504420c5c4","originalAuthorName":"王华"},{"authorName":"张云鹏","id":"986be6f1-f21f-457c-afaf-5e1c0538ac72","originalAuthorName":"张云鹏"},{"authorName":"陈兴友","id":"11d4964c-554f-43e5-8b15-8cfdd4c3b166","originalAuthorName":"陈兴友"}],"doi":"","fpage":"124","id":"85a4b92d-4450-48e3-855a-29d68eb23636","issue":"7","journal":{"abbrevTitle":"CLRCLXB","coverImgSrc":"journal/img/cover/CLRCLXB.jpg","id":"15","issnPpub":"1009-6264","publisherId":"CLRCLXB","title":"材料热处理学报"},"keywords":[{"id":"271d5c18-35c5-457a-9230-3013900a983e","keyword":"累积复合轧制","originalKeyword":"累积复合轧制"},{"id":"99355d4d-2a63-445d-a594-bcd5b15320c3","keyword":"轧制力","originalKeyword":"轧制力"},{"id":"2d15a6a2-c328-400a-ada3-bafccd7700ca","keyword":"TZM板","originalKeyword":"TZM板"},{"id":"c310d19e-cb1c-42e3-99f0-2b6b89eee57d","keyword":"晶粒细化","originalKeyword":"晶粒细化"}],"language":"zh","publisherId":"jsrclxb201307023","title":"Ti-Zr-Mo合金累积复合轧制工艺","volume":"34","year":"2013"},{"abstractinfo":"采用粉末冶金法制备出TZM合金烧结坯,并将其轧制成2mm厚板材,在此基础上采用累积复合轧制技术(ARB),完成TZM板四次轧制复合,并对不同道次TZM复合板进行性能测试和组织分析.结果表明:随累积变形量增加,复合板晶粒显著细化、组织分布更加均匀,经过三次累积复合后,材料的抗拉强度和界面结合状态最佳.试样晶粒在轧制过程中被拉长、展宽,晶粒断面直径200~500nm,抗拉强度提高50%,2mm TZM复合板最高抗拉强度可达968MPa;材料断裂特征仍为脆性断裂,伸长率变化不明显,轧制复合板伸长率仅为2.0%.","authors":[{"authorName":"王华","id":"5eaebe54-b1a8-4f08-88ae-e04d37e7c9e8","originalAuthorName":"王华"},{"authorName":"张云鹏","id":"5011cab0-9ef8-4b98-b81c-c892e3ef0e41","originalAuthorName":"张云鹏"},{"authorName":"陈兴友","id":"431cf888-f0f3-4f2a-b52e-fc71fc3c428e","originalAuthorName":"陈兴友"}],"doi":"10.3969/j.issn.1005-5053.2013.4.004","fpage":"22","id":"83735535-ec0f-48f3-b42b-0fabb9889b8d","issue":"4","journal":{"abbrevTitle":"HKCLXB","coverImgSrc":"journal/img/cover/HKCLXB.jpg","id":"41","issnPpub":"1005-5053","publisherId":"HKCLXB","title":"航空材料学报"},"keywords":[{"id":"e91979e5-d256-4ba4-9708-ca4acc23f189","keyword":"累积复合轧制","originalKeyword":"累积复合轧制"},{"id":"8bb916bb-af9a-4f2c-857d-040a79b2ea00","keyword":"TZM板","originalKeyword":"TZM板"},{"id":"02a655aa-2b81-4562-a061-b0870b6489b1","keyword":"晶粒细化","originalKeyword":"晶粒细化"}],"language":"zh","publisherId":"hkclxb201304004","title":"累积复合轧制TZM合金板的组织与性能","volume":"33","year":"2013"},{"abstractinfo":"综述了累积复合轧制(ARB)的工艺原理及累积复合轧制材料晶粒的细化机理、力学性能、组织与织构演变特征,分析了目前研究中存在的问题,指出累积复合轧制是制备大块体超细晶金属材料最有效的强烈塑性加工工艺.","authors":[{"authorName":"黄光杰","id":"bddf9c62-c5bd-4ccd-8ad8-0cba68ccdc38","originalAuthorName":"黄光杰"},{"authorName":"邹彬","id":"b0c153df-6a0a-4579-b2ac-77ac2244759c","originalAuthorName":"邹彬"},{"authorName":"黄鑫","id":"5043f950-6410-4c5d-a91c-b32728eedb8a","originalAuthorName":"黄鑫"},{"authorName":"陈泽军","id":"8679d66f-c4b0-434f-ac28-dd8e32d19b8b","originalAuthorName":"陈泽军"},{"authorName":"刘庆","id":"ca0d3b8b-d577-40ff-b33a-26855238d848","originalAuthorName":"刘庆"}],"doi":"","fpage":"6","id":"dd549c6a-3cc6-440b-a2dd-02827148ff0e","issue":"9","journal":{"abbrevTitle":"CLDB","coverImgSrc":"journal/img/cover/CLDB.jpg","id":"8","issnPpub":"1005-023X","publisherId":"CLDB","title":"材料导报"},"keywords":[{"id":"2edc80ff-6c32-4c81-8f28-69f1d943d774","keyword":"累积复合轧制","originalKeyword":"累积复合轧制"},{"id":"b73668be-14ad-4a4f-99fd-734412145375","keyword":"层状材料","originalKeyword":"层状材料"},{"id":"300a12d3-7b7c-4368-b9d7-ce6abe2c0d0d","keyword":"超细晶","originalKeyword":"超细晶"},{"id":"affc78d1-c9b5-40da-8003-36f16d1c3d75","keyword":"性能","originalKeyword":"性能"},{"id":"84871287-d71d-446f-9ef9-b36340e67493","keyword":"织构演变","originalKeyword":"织构演变"}],"language":"zh","publisherId":"cldb201109002","title":"累积复合轧制法制备层状超细晶材料的研究现状","volume":"25","year":"2011"},{"abstractinfo":"系统介绍了大塑性变形细化晶粒的条件和工艺,综述了制备细晶镁合金的三种大塑性变形工艺的基本原理、特点和应用,剖析了细晶镁合金的强度和超塑性特征,指出了大塑性变形制备高强镁合金的发展方向.","authors":[{"authorName":"陈勇军","id":"f95a2bf5-15da-4e5a-9a56-c632bac433e4","originalAuthorName":"陈勇军"},{"authorName":"王渠东","id":"fe705588-cea4-4476-9b54-f46917e55bd3","originalAuthorName":"王渠东"},{"authorName":"翟春泉","id":"18dff3f4-4d6f-45c2-95f4-25f5e11368f9","originalAuthorName":"翟春泉"},{"authorName":"丁文江","id":"259c67d3-87b6-441b-8eb0-457a70a66117","originalAuthorName":"丁文江"}],"doi":"10.3969/j.issn.1000-3738.2006.03.001","fpage":"1","id":"b04555b5-461e-48ed-9f5f-8f9b8e66395f","issue":"3","journal":{"abbrevTitle":"JXGCCL","coverImgSrc":"journal/img/cover/JXGCCL.jpg","id":"45","issnPpub":"1000-3738","publisherId":"JXGCCL","title":"机械工程材料"},"keywords":[{"id":"0150ee6c-854a-4508-ae15-6e3a9d8d9d7f","keyword":"大塑性变形","originalKeyword":"大塑性变形"},{"id":"c186e08d-dd3e-41a6-b365-f6d6662add52","keyword":"通道转角挤压","originalKeyword":"通道转角挤压"},{"id":"be7e5dc0-6466-4423-a1fa-d153531279ce","keyword":"累积轧制","originalKeyword":"累积轧制"},{"id":"34fe43dc-34aa-413c-9d73-aa86568cf3f7","keyword":"大比率挤压","originalKeyword":"大比率挤压"},{"id":"825e5714-9fe1-43e0-8e5a-a6011bdc09f1","keyword":"高强镁合金","originalKeyword":"高强镁合金"}],"language":"zh","publisherId":"jxgccl200603001","title":"大塑性变形制备高强镁合金的研究与展望","volume":"30","year":"2006"},{"abstractinfo":"采用累积复合轧制技术(ARB)成功制备2、4、8、16层不锈钢钢板,通过对不同道次金属材料的测试和分析.结果表明:随累积变形量的增加,材料组织显著得到细化,材料的抗拉强度、硬度提高和界面结合强度的增强,如经过ARB4道次后,试样晶粒直径达到1-2μm,抗拉强度提高了约1倍;材料延伸率随着ARB累积变形量的增加显著下降,ARB4道次后其断后伸长率仅为5.8%.","authors":[{"authorName":"谷坤文","id":"d0163ffd-5812-4751-b8c9-cb7d9153a5e4","originalAuthorName":"谷坤文"},{"authorName":"袁守谦","id":"9eac2393-2627-44b2-bc33-772f311b0389","originalAuthorName":"袁守谦"},{"authorName":"张兵","id":"4652bc40-a575-41ca-af8b-0e2aa9b87657","originalAuthorName":"张兵"},{"authorName":"赵田丽","id":"eafcd806-e248-4d1c-9c14-1e69c66f4956","originalAuthorName":"赵田丽"},{"authorName":"卢斌","id":"0585e12e-7108-44ec-8dfa-a43804431a25","originalAuthorName":"卢斌"},{"authorName":"余海峰","id":"59ab8879-dbbe-4c2e-9d15-48f4c9c1c88f","originalAuthorName":"余海峰"}],"doi":"10.3969/j.issn.1004-244X.2011.02.012","fpage":"41","id":"f7461875-aca4-403a-b6c2-fb7491ba832b","issue":"2","journal":{"abbrevTitle":"BQCLKXYGC","coverImgSrc":"journal/img/cover/BQCLKXYGC.jpg","id":"4","issnPpub":"1004-244X","publisherId":"BQCLKXYGC","title":"兵器材料科学与工程 "},"keywords":[{"id":"1fed7f42-1c3a-4392-98f0-76279456b8de","keyword":"累积复合轧制","originalKeyword":"累积复合轧制"},{"id":"b03d8e13-00c8-4d54-a851-b30318a98fd7","keyword":"不锈钢","originalKeyword":"不锈钢"},{"id":"ef146bd3-f662-4ead-8571-1d25d6573e78","keyword":"晶粒细化","originalKeyword":"晶粒细化"},{"id":"3f1b32b4-01c7-4500-8898-582b100728bd","keyword":"界面结合","originalKeyword":"界面结合"}],"language":"zh","publisherId":"bqclkxygc201102012","title":"累积复合轧制不锈钢钢板的组织和性能","volume":"34","year":"2011"},{"abstractinfo":"采用累积轧制(ARB)技术在室温下对1060工业纯铝进行轧制试验,用光学显微镜、透射电镜、拉伸试验机研究分析了变形前及不同道次后材料的微观组织和力学性能.结果表明:材料经轧制后,获得小于1μm的细晶粒,在ARB 7道次后得到了平均晶粒尺寸为520 nm的超细晶组织;随着ARB道次的增加,材料的抗拉强度在ARB 4道次后达到最大值197 MPa,之后略有降低;硬度值上升,在ARB 4道次后变化平缓;伸长率在ARB前3道次过程中从23%下降到9%,随着ARB道次的增加,伸长率回升,在ARB 7道次后为16%.","authors":[{"authorName":"张兵","id":"2413f320-b663-45e8-9a04-6113e9614729","originalAuthorName":"张兵"},{"authorName":"袁守谦","id":"e7b507a3-e525-435f-9347-f710d896a646","originalAuthorName":"袁守谦"},{"authorName":"魏颍娟","id":"c37aff5a-9061-4148-8296-cae19badb451","originalAuthorName":"魏颍娟"},{"authorName":"张西锋","id":"969db917-54d0-4a85-9584-da30d48dd2a4","originalAuthorName":"张西锋"},{"authorName":"吕爽","id":"9c3f7fdc-e9cd-4666-a283-65760c30a5b0","originalAuthorName":"吕爽"}],"doi":"10.3969/j.issn.1000-3738.2008.01.019","fpage":"67","id":"4cf837bc-9418-4398-8034-243335f28e51","issue":"1","journal":{"abbrevTitle":"JXGCCL","coverImgSrc":"journal/img/cover/JXGCCL.jpg","id":"45","issnPpub":"1000-3738","publisherId":"JXGCCL","title":"机械工程材料"},"keywords":[{"id":"b2748631-f89d-401d-a6a2-33ebfbef1f94","keyword":"累积叠轧","originalKeyword":"累积叠轧"},{"id":"3158acf5-9325-45b6-a811-b775069518c2","keyword":"工业纯铝","originalKeyword":"工业纯铝"},{"id":"37fa9009-ef40-4cf2-a35a-25249c0bc4d1","keyword":"微观组织","originalKeyword":"微观组织"},{"id":"6c9de1b0-07ab-4a14-8ee2-b7000bb60f0a","keyword":"力学性能","originalKeyword":"力学性能"}],"language":"zh","publisherId":"jxgccl200801019","title":"1060铝在累积轧制中组织和性能的演变","volume":"32","year":"2008"},{"abstractinfo":"本工作在室温下采用累积叠轧工艺对纯铜薄板进行1~9道次的大塑性变形加工.采用金相显微镜、双束系统FIB/SEM、TEM及拉伸试验机进行组织观察及力学性能测试,获得纯铜板累积叠轧过程显微组织演变和力学性能演变规律.结果表明:累积叠轧形成的初始界面存在微缝隙和纳米层等缺陷,其中微缝隙随着叠轧的进行而逐渐消失,最终形成冶金界面结合;纳米层由片层厚度为20~60nm的片层晶组成,并包含变形孪晶.在轧辊压缩力与剪切力的共同作用下,原始粗晶晶粒由等轴晶变成片层晶,且发生明显细化,6道次后晶粒片层厚度由退火态的~50μm细化到0.2μm左右;晶粒细化主要以位错滑移分割为主,并伴随少量的孪生;材料的硬度和屈服强度明显提高,9道次后达到最大值,硬度为137HV,约为母材的3倍;屈服强度达450MPa,约为母材的5倍;断裂延伸率在首道次剧烈下降,并在随后道次保持在5%左右.","authors":[{"authorName":"庄丽敏","id":"d72e716d-611c-4921-8401-69c58a05777d","originalAuthorName":"庄丽敏"},{"authorName":"赵永好","id":"d1e63cd4-a732-49b1-b57b-cc9864bf8946","originalAuthorName":"赵永好"},{"authorName":"梁宁宁","id":"47d03473-9c8b-4737-b794-3c5e291b23c8","originalAuthorName":"梁宁宁"},{"authorName":"王天驰","id":"ce73c3f9-e1e2-4647-bb88-3d8ac6ae4559","originalAuthorName":"王天驰"},{"authorName":"韦大杰","id":"62e9687b-d380-402f-9e93-d276bd037a9e","originalAuthorName":"韦大杰"},{"authorName":"刘学然","id":"f7b7b73c-448c-4a21-a35f-6207fba9db3a","originalAuthorName":"刘学然"},{"authorName":"沈光骏","id":"0e8097c2-61b0-4e36-b8c0-9d95e617a5e9","originalAuthorName":"沈光骏"},{"authorName":"刘明星","id":"eafcf876-00fa-452c-971a-06ea53282bce","originalAuthorName":"刘明星"}],"doi":"10.14136/j.cnki.issn 1673-2812.2015.05.006","fpage":"650","id":"1f0ba493-788f-4595-b2af-522f8a99d1ca","issue":"5","journal":{"abbrevTitle":"CLKXYGCXB","coverImgSrc":"journal/img/cover/CLKXYGCXB.jpg","id":"13","issnPpub":"1673-2812","publisherId":"CLKXYGCXB","title":"材料科学与工程学报"},"keywords":[{"id":"86df85a4-5d99-4c4f-86f8-33f6f0ccc46e","keyword":"累积叠轧","originalKeyword":"累积叠轧"},{"id":"f4d04b93-ddc2-4ff3-9554-8ed4c134c701","keyword":"超细晶多层铜板","originalKeyword":"超细晶多层铜板"},{"id":"1811b329-0d6d-4263-9089-894211802c1e","keyword":"组织演变","originalKeyword":"组织演变"},{"id":"da7e77c9-d73a-4042-ac30-3dd5923c8aea","keyword":"界面硬质层","originalKeyword":"界面硬质层"},{"id":"279f7e8f-69fa-4a10-ada4-3728c9ce415a","keyword":"力学性能","originalKeyword":"力学性能"}],"language":"zh","publisherId":"clkxygc201505006","title":"累积轧制备超细晶纯铜多层板的组织和性能","volume":"33","year":"2015"},{"abstractinfo":"以L2纯铝为基体金属,TiH2粉末为发泡剂,通过累积叠轧试验,探索泡沫铝制备的新方法.结果显示,叠轧道次对泡沫铝孔隙率与平均孔径影响显著,叠轧道次越多,孔隙率越高,平均孔径越小;TiH2含量与发泡温度是影响发泡驱动力的主要因素,试验温度范围内,发泡剂含量越大,温度越高,发泡驱动力越强,发泡后孔隙率越高,并且平均孔径也越大.叠轧6道次的L2纯铝,发泡剂含量0.5%(质量分数),在670℃条件下发泡5min,可以获得孔隙率61.4%,平均孔径1.6mm的泡沫铝.上述研究表明,累积叠轧焊是一种有效的泡沫铝制备方法,通过工艺参数的优化,可以获得孔隙均匀,高孔隙率的泡沫铝.","authors":[{"authorName":"王耀奇","id":"606f13ff-d783-414e-8f91-9fe5106a0967","originalAuthorName":"王耀奇"},{"authorName":"侯红亮","id":"ee83c994-d7e4-4eda-997d-a41bd3138cfc","originalAuthorName":"侯红亮"},{"authorName":"姜波","id":"71f5ce59-ebfb-42aa-aee4-409473f9d1e2","originalAuthorName":"姜波"},{"authorName":"于庆波","id":"8ed0eefd-41a9-4a2e-8719-c743c057b6fb","originalAuthorName":"于庆波"}],"doi":"","fpage":"1190","id":"2703361d-a8b6-481a-8aaf-d9b934b476c2","issue":"7","journal":{"abbrevTitle":"GNCL","coverImgSrc":"journal/img/cover/GNCL.jpg","id":"33","issnPpub":"1001-9731","publisherId":"GNCL","title":"功能材料"},"keywords":[{"id":"167dd2b8-5f65-4512-bc54-9499c213b086","keyword":"L2纯铝","originalKeyword":"L2纯铝"},{"id":"b953d01a-538e-4719-930f-764d8f98a654","keyword":"累积叠轧","originalKeyword":"累积叠轧"},{"id":"6e9e39ac-5a3c-45fe-ac99-ef2e3e93fb68","keyword":"泡沫铝","originalKeyword":"泡沫铝"},{"id":"5a696f12-25a7-4937-b859-2d53922d0b9a","keyword":"孔隙结构","originalKeyword":"孔隙结构"}],"language":"zh","publisherId":"gncl201007022","title":"泡沫铝累积轧制备方法及孔隙结构研究","volume":"41","year":"2010"},{"abstractinfo":"以工业纯Ti、纯Ni板材为初始材料,采用累积叠轧法(ARB)制备出Ti/Ni多层复合板材料.利用扫描电镜、透射电镜、万能材料试验机、显微硬度仪对复合材料的组织、界面结构和力学性能进行观察和测试分析.结果表明:随着轧制道次的增加,复合材料中Ti层和Ni层显微组织细化明显,均匀程度提高,ARB 5道次后,Ti、Ni层的平均晶粒尺寸分别为200和300 nm;复合材料的抗拉强度、显微硬度显著提高;ARB 5道次后抗拉强度达到810 MPa,延伸率为24.4%,Ti、Ni层平均HV显微硬度分别为2.33和2.29 GPa.在ARB 0~5道次轧制变形过程中,界面处无明显的原子扩散现象发生.","authors":[{"authorName":"张兵","id":"6817a1aa-e516-408f-af18-b02a560226ac","originalAuthorName":"张兵"},{"authorName":"王乐","id":"c6fa5605-77d8-4073-807f-160c8448050d","originalAuthorName":"王乐"},{"authorName":"张巡辉","id":"f2e20def-9a65-4854-bd11-435fc78edf8f","originalAuthorName":"张巡辉"},{"authorName":"张仁杰","id":"187715a6-b781-4594-94cc-f9465d1ae1bd","originalAuthorName":"张仁杰"},{"authorName":"张志娟","id":"54855a0c-cb94-4e8f-9e39-022f71aae60d","originalAuthorName":"张志娟"},{"authorName":"王快社","id":"f54ece99-3b7e-4bfc-a34f-018dba8d4476","originalAuthorName":"王快社"}],"doi":"","fpage":"2352","id":"0f16d685-9345-4249-b977-9fc2586d1e70","issue":"9","journal":{"abbrevTitle":"XYJS","coverImgSrc":"journal/img/cover/XYJS.jpg","id":"67","issnPpub":"0258-7076","publisherId":"XYJS","title":"稀有金属"},"keywords":[{"id":"186f772e-76ba-46b4-894f-3c5e18ff455a","keyword":"累积叠轧","originalKeyword":"累积叠轧"},{"id":"0e27d4c3-4dfa-4fa2-a5cd-989a67c8435a","keyword":"Ti/Ni多层复合","originalKeyword":"Ti/Ni多层复合"},{"id":"37fac28e-f84a-4d6e-98ad-0a2b8ed652d3","keyword":"微观组织","originalKeyword":"微观组织"},{"id":"c72f412a-7b1c-47a5-a426-c61291321363","keyword":"力学性能","originalKeyword":"力学性能"}],"language":"zh","publisherId":"xyjsclygc201609029","title":"累积轧制备Ti/Ni多层复合材料的组织演变与力学性能","volume":"45","year":"2016"},{"abstractinfo":"对纯铜进行一至三道次大塑性异步累积叠轧变形,观察显微组织及晶界的演变过程,并探讨了纯铜异步累积叠轧的晶粒细化机制.结果表明:纯铜异步累积叠轧形成S带;S带中形成连续的纵横交割位错墙,将S带分割、细化,获得具有亚晶结构的超细晶纯铜,亚晶尺寸为0.5~1 μm.异步累积叠轧晶粒细化过程中,形成断断续续的分散状态的小角度亚晶界,在剪切力作用下逐渐合并成为超细晶粒中连续的小角度亚晶界.","authors":[{"authorName":"周蕾","id":"d99102df-7934-45b8-b949-2fb9d2a981b8","originalAuthorName":"周蕾"},{"authorName":"史庆南","id":"a900cdc6-71a0-483e-8cdf-6c9a564b8535","originalAuthorName":"史庆南"},{"authorName":"王军丽","id":"1e7d080f-a186-431d-ae07-c5a7bd774457","originalAuthorName":"王军丽"}],"doi":"10.11868/j.issn.1005-5053.2014.5.008","fpage":"49","id":"2cf677bd-0f26-4416-adfe-76a82f28955a","issue":"5","journal":{"abbrevTitle":"HKCLXB","coverImgSrc":"journal/img/cover/HKCLXB.jpg","id":"41","issnPpub":"1005-5053","publisherId":"HKCLXB","title":"航空材料学报"},"keywords":[{"id":"062be6fa-7a3e-4c5e-9e02-2385565ddc78","keyword":"异步累积叠轧","originalKeyword":"异步累积叠轧"},{"id":"9fb0ca53-4e78-4050-b830-6538e1919941","keyword":"纯铜","originalKeyword":"纯铜"},{"id":"67f60ea3-21da-47fc-8a18-546350252c51","keyword":"细化机制","originalKeyword":"细化机制"},{"id":"83ec134b-86ef-4d4d-b879-47e5ac32c3c4","keyword":"S带","originalKeyword":"S带"},{"id":"da2bc679-278c-4a62-96d7-e08d4bdcf14a","keyword":"晶界","originalKeyword":"晶界"}],"language":"zh","publisherId":"hkclxb201405008","title":"异步累积轧制备超细晶纯铜微观组织演化规律及细化机制","volume":"34","year":"2014"}],"totalpage":385,"totalrecord":3847}