ZHANG Ming-ya
,
ZHU Fu-xian
,
ZHENG Dong-sheng
钢铁研究学报(英文版)
Through the comparison of microstructure for polygonal ferrite (PF) matrix transformation induced plasticity (TRIP) seamless steel tube at different positions before and after tensile rupture, the transformation behavior of retained austenite (RA) was studied. The results showed that there were no yield points in tensile process and the splendid elongation and tensile strength were contributed by the uniform ferrite/bainite grains and the transformation of RA. The stability of RA was to some extent in inverse proportion with the ability of transformation induced plasticity. The coarse retained austenite located in ferrite and ferrite/bainite laths were all transformed into martensite during the tensile process.
关键词:
TRIP steel
,
retained austenite
,
austempering
,
heat treatment
宋育来
,
陈吉清
,
陈邦文
,
刘静
,
刘志勇
,
胡敏
钢铁研究
研究了集装箱用SM490YA钢板的力学性能、工艺性能、微观组织结构等.采用气体保护焊对钢板进行焊接性能试验评价,并对钢的强韧化机理进行初步探讨.结果表明,SM490YA钢板不仅性能稳定,不存在明显的各向异性,易于成型,而且钢板焊接性能优良,是制造集装箱的理想钢板.
关键词:
集装箱钢
,
力学性能
,
工艺性能
,
焊接性能
,
微观组织
林元华
,
张中太
,
张枫
,
唐子龙
,
吕霄
,
郑子山
功能材料
利用SrCO3-A12O3-RE(NO3)3(RE:Eu,Dy)粉体为原料,加入少量酒精,进行预混合、球磨、干燥.将此混合粉体在还原气氛下高温烧成,最终制得不同发光性能的xSrO.yAl2O3:RE(RE:Eu,Dy)光致发光材料,并对其性能进行了研究.发光粉体的发射光谱表明,随着A12O3/SrO(摩尔比x)的增加,其相应粉体发射光谱的主峰位置(λE)逐渐向短波方向移动,符合λE=531.018-23.028X关系式.余辉衰减曲线表明,这些发光材料均具有一定的长余辉特性.从而说明只要控制一定的Al2O3/SrO比例,即可获得发光颜色为紫色到绿色的多种发光材料.对于其长余辉机制,认为是加入的Dy3+起到了陷阱能级的作用,它将部分空穴俘获,并在热扰动下,慢慢将空穴释放出来,并再次与介稳态Eu1+复合发光,从而达到延长余辉的作用.
关键词:
长余辉
,
发光材料
,
发射光谱
,
空穴
Journal of Materials Research
The morphology of the dark and bright regions observed by transmission electron microscopy for the Zr(64.13)Cu(15.75)Ni(10.12)Al(10) bulk metallic glass strongly depends on the ion beam parameters used for ion milling. This indicates that the ion beam could introduce surface fluctuation to metallic glasses during ion milling.
关键词:
room-temperature
胡海龙
,
曾宇平
,
左开慧
,
夏咏锋
,
姚冬旭
无机材料学报
doi:10.15541/jim20140181
分别以Y2O3-Al2O3(YA)和Y2O3-MgO(YM)为烧结助剂，采用气压烧结工艺制备了Si3N4/SiC陶瓷，研究了两种不同的烧结助剂对陶瓷的力学和摩擦性能的影响。研究结果表明：添加不同种类的烧结助剂对制备陶瓷的相对密度、抗弯强度、断裂韧性、硬度、摩擦系数和磨损率影响很大；与添加烧结助剂YM相比较，添加烧结助剂YA的Si3N4/SiC陶瓷在烧结过程中表现出了更好的烧结性能，得到的陶瓷样品最终显示了更好的力学和摩擦性能，尤其是SiC添加量为20wt%的Si3N4/SiC陶瓷。这主要归因于烧结助剂YA的添加使Si3N4/SiC陶瓷呈现出了更高的相对密度，获得的晶粒长径比更小。
关键词:
Si3N4/SiC陶瓷
,
烧结助剂
,
抗弯强度
,
摩擦性能
