熊继春李嘉荣赵金乾刘世忠董建新
金属学报
对单晶高温合金DD6进行表面吹砂处理, 然后进行固溶与时效真空热处理, 采用SEM, TEM, EPMA和Thermo-Calc的方法研究了单晶合金DD6再结晶晶界析出相的特征及其形成机制. 结果表明, 经过吹砂处理的DD6合金在固溶与时效热处理过程中发生再结晶. 再结晶晶界出现析出相, 分析表明析出相为M6C碳化物, 该碳化物呈粒状析出, 尺寸约为0.5 μm, 数量极少, 富含W, Re和 Mo, 且Cr, Nb和Co的含量与合金名义成分差别不大, 而Al, Ta和Ni含量较低. 由于再结晶晶界上C元素的聚集效应, C原子在晶界上达到一定浓度后即与一定数量的W, Mo等μ相形成元素发生相变反应, 抑制了合金析出μ相的倾向. 又因为DD6合金W含量较高, 而Cr含量较低, 抑制了M23C6碳化物, 有利于析出M6C碳化物.
关键词:
单晶高温合金
,
DD6
,
recrystallization
,
precipitate
W. H. Tian
,
S.L. Hu and M. Nemoto(Department of Materials Physics
,
University of Science and Technology Beijing
,
Beijing 100083
,
China)(Department of Materials Forming
,
University of Science and Technology Beijing
,
Beijing 100083
,
China)(Department of Materials Science and Engineering
,
Faculty of Engineering
,
Kyushu University
,
Fukuoka 812
,
Japan)
金属学报(英文版)
The Co3 Ti phase hardens appreciably by the fine precipitation of disordered fcc Co-rich phase upon aging after quenching from solution annealing temperature. Transmission electron microscope (TEM)observations revealed that the precipitates are platelet in shape, lying nearly parallel to the {100} planes of the L12-ordered matrix, and perfectly coherent with the matrix lattice at the beginning of aging. The high temperature strength increases appreciably with the fine precipitation of disondered Co-rich phase over the whole temperature range investigated. TEM observations of the deformed alloys after underaging revealed that saperdislocations are pinned by precipitates indicating an attractive interaction between dislocations and precipitates.
关键词:
Co_3 Ti
,
null
,
null
,
null
,
null
W.H. Tian
,
S.L. Hu and M. Nemoto(1) Department of Materials Physics
,
University of Science and Technology Beijing
,
Beijing 100083
,
China 2) Department of Materials Forming
,
University of Science and Technology Beijing
,
Beijing 100083
,
China 3) Department of Materials Science and Engineering
,
Faculty of Engineering
,
Kyushu University
,
Fukuoka 812
,
Japan)Manuscript received in revised form 12 October 1998
金属学报(英文版)
The effect of Cr addition on the microstructures and mechanical properties of NiAl inermetallic alloys containing 4 to 8 mol% Cr has been characterized. It is shown that Cr is not only an efficient soild solution strengthener in NiAl, it is also an efficient precipitation Strengthener by fine dispersion of α-Cr particles. Transmission electron microscope observations have revealed that fine spherical particles of α-Cr appeared homogeneously in the NiAl matrix by aging at temperatures around 1073K after solution annealing at 1563K. The aging behavior was investigated by microhardness measurements and the temperature dependence of the yield stress of NiAl containing α-Cr particles was investigated by compression tests over the tempemture range from 298 to 1173K. NiAl alloys happened appreciably by the precipitation of α-Cr particles.Dislocations bypass the particles during deformation and typical Orowan loops were observed surrounding the α-Cr particles after deformation. Although the dispersion Of α-Cr particles increases the yield strength of NiAl at intermediate temperutre, the strength decreases appreciably at higher temperatures.
关键词:
NiAl
,
null
,
null
,
null
,
null
W.H. Tian
,
A.L. Fan and M. Nemoto (Department of Materials Physics and Chemistry
,
University of Science and Technology Beijing
,
Beijing 100083
,
China
,
Sasebo National College of Technology
,
Okishin 1-1
,
Sasebo 857-1193
,
Japan)
金属学报(英文版)
The microstructures of B2-ordered NiA1 containing α-Fe precipitates have been investigated in terms of transmission electron microscopy. Fine precipitation of α-Fe (bcc structure) occurs in NiA1 by aging around 973K. The aging behavior was investigated by microhandness measurements and the temperature dependence of the yield strength of precipitate- comaining B2- ordered NiA1 was investigated by compression tests over the temperature range of 673-1273K. The fine precipitation of α-Fe was found to enhance greatly the low and intermediate temperature yield strength. When the deformation temperature is over 1073K, the strength of precipitate- containing NiA1 was comparable to ternary solid solution hardening NiA1-Fe. Dislocations bypass the particles during deformation and typical Orowan loops were observed surrounding the or-Fe particles after deformation.
关键词:
nickel aluminide
,
null
,
null
,
null
,
null
高鹏越
,
任慧平
,
金自力
,
刘丽珍
,
师彩娟
,
董梦瑶
稀土
针对Ce对取向硅钢高温退火后组织、织构及第二相的影响进行了探究,在实验室利用真空电弧炉熔炼了不同Ce含量的取向硅钢试样,并模拟了取向硅钢热轧、常化、冷轧、脱碳退火、高温退火.观察并测定了高温退火后组织、织构以及抑制剂的溶解和团聚情况.结果表明,添加适量Ce有利于高温退火过程中形成尺寸较大的晶粒;高温退火过程中Ce化合物并未发生溶解,而是粗化长大,形成尺寸为0.3μm～2μm的第二相;添加适量Ce有利于提高高温退火后整体的织构密度水平.
关键词:
取向硅钢
,
Ce
,
高温退火
,
第二相
张文达
,
白培康
,
杨晶
,
段瑞斌
,
党惊知
材料热处理学报
利用扫描电子显微镜(SEM)、透射电子显微镜(TEM)和X射线衍射(XRD)等方法研究了不同复合热处理(深冷处理+均匀化处理)工艺对再生3104铝合金的微观组织影响.XRD图谱表明,深冷处理使3104铝合金基体(200)晶面衍射峰相对强度升高甚至超过(111)晶面成为最强峰.经均匀化处理后,粗大析出相逐步溶入基体,部分最终呈粒状断续分布在晶界上,基体中也出现大量片状Al6Mn析出相.经先深冷处理后均匀化处理的再生3104铝合金中Al6Mn相尺寸最小,为(3.25 ±1.18)μm,在基体中分布也更加均匀,这主要是由于在深冷处理过程中产生大量位错,为析出相的扩散、形核提供了通道和形核核心.
关键词:
3104合金
,
均匀化处理
,
深冷处理
,
析出相
袁丰伟
,
郑海忠
,
鲁世强
,
胡春文
,
王晓震
机械工程材料
采用光学显微镜研究了固溶和时效处理对0Cr21Ni6Mn9N含氮奥氏体不锈钢显微组织的影响.结果表明:0Cr21Ni6Mn9N钢冷拔管经1 100℃固溶处理后,晶粒尺寸变大,孪晶数量增多且层厚增加,晶界及晶粒均很清晰,无任何析出物;经固溶及650℃时效处理后,晶粒尺寸与固溶态的相差不大,但晶界上有大量黑色粒状M23C6相析出;经固溶及850℃时效处理后,出现大晶粒吞并小晶粒的现象,晶粒发生了二次长大,且晶界处的M23C6相数量较650℃时效的有所减少.
关键词:
0Cr21Ni6Mn9N钢
,
固溶时效处理
,
退火孪晶
,
析出相
薛艳春
,
马良
,
仇圣桃
钢铁钒钛
doi:10.7513/j.issn.2015.03.023
采用薄板坯工艺制备了厚度为20mm的2.9％ Si-0.77％ Al无取向硅钢铸坯,经热轧、常化、冷轧、退火后,对其显微组织、析出物、磁性能进行了检测分析,结果表明:铸带为穿晶组织,热轧板表层为细小的再结晶晶粒,中心层为粗大的变形晶粒,热轧板常化后再结晶完全,成品板为等轴晶组织.成品析出物主要是AlN和(MnS+AlN)复合析出物,尺寸较粗大,为0.5～2.5 μm.成品磁性能为P15 =2.86 W/kg,B50=1.70 T.
关键词:
薄板坯
,
组织
,
析出物
,
无取向硅钢
曾苗霞
,
林振铭
,
李文涛
,
金曼
材料研究学报
用差示扫描量热分析(DSC)、硬度分析、透射电镜(TEM)、三维原子探针(3DAP)分析等手段研究了Al-Zn-Mg-(Cu)合金线性升温时效析出相的析出规律、性能变化和Cu对合金的影响.结果表明:随着时效温度的提高Al-Zn-Mg合金和Al-Zn-Mg-Cu合金的硬度先上升达到峰值然后下降,Al-Zn-Mg-Cu合金的硬度高于Al-Zn-Mg合金.线性升温峰时效后两种合金的主要析出相为η相,都含有少量的GP区和η相.Cu的添加改变了析出相的化学成分和结构,延缓了亚稳相向平衡相的转变.
关键词:
金属材料
,
Al-Zn-Mg-(Cu)合金
,
线性升温
,
时效
,
析出相
