MIM Fe基合金的合金化强化

研究金属粉末注射成形铁基合金在强还原性氢气氛烧结条件下的合金化强化效果，结果表明，添加Ｃｕ、Ｎｉ、Ｍｏ等元素能取得显著的固溶强化效果，其中成分为Ｆｅ－２Ｎｉ－２Ｃｕ－０．４５Ｍｏ的机械性能达到σｂ＝４８３ＭＰａ，σｓ＝３４０ＭＰａ，δ＝９％和ＨＲＢ８３。     

MECHANISM OF NON-EQUILIBRIUM SEGREGATION OF SOLUTE TO GRAIN BOUNDARIES

本文以空位-溶质原子拖曳机制为基础,并考虑了空位、溶质原子和复合体三者的反应平衡及晶界平衡偏聚的作用,得到了溶质原子的非平衡晶界偏聚动力学方程。对硼在奥氏体中等温及连续冷却时所产生的非平衡晶界偏聚现象进行了理论计算,得到了与实验较为一致的结果。     

Fe-Ni-Mn合金中等温马氏体的生长过程

本文采用透射电子显微镜研究了Fe-21Ni-4Mn合金中等温马氏体的生长过程,着重探讨了生长过程中亚结构的发展和变化.结果表明,在马氏体生长的初期阶段,小的薄片状马氏体的亚结构完全是以(112)_b为孪晶面的孪晶,并且贯穿整个片内,相界面平直向前生长.稍后阶段,片的生长主要集中在一侧,此例相界面弯曲向前生长,出现非孪晶区域,内含大量位错,同时,片的孪晶弯曲.生长到后期,弯曲的相界面变为平直,邻近相同位向的小片相互联接在一起,形成一宏观惯习面为(252)_f的大马氏体片,而构成大片的小马氏体片的惯习面为(121)_f.     

Cu-Fe-Cr原位复合材料中的纤维相

通过感应熔炼、铸造、锻造和冷拔变形制备了Cu-16Fe-2Cr(质量分数,％)原位复合材料,最终线材(其轧制后的冷拔变形量达到η=ln(A_0/A)=5.42,A_0和A分别为冷拔起始和冷拔后线材的横截面面积)的抗拉强度为980 MPa。将Cu基体选择腐蚀后提取出纤维,采用SEM和TEM观察分析纤维相组织形态。在较低的应变量时,一些Fe—Cr纤维保持着与铸态树枝晶相同的bcc单晶结构,选区电子衍射表明纤维已经形成了〈110〉织构。在较高的应变量时,单根Fe-Cr纤维分为一些由晶界隔开的平行亚单元(宽度约为100 nm),通过亚单元共同的[110]衍射获得了晶粒之间的相对取向关系,相邻晶粒的偏差角在11°—82°之间。根据Hall-Petch关系讨论了原位复合材料的强度问题。     

A NEW ELECTROMAGNETIC IMAGING SCHEME

ＡＮＥＷＥＬＥＣＴＲＯＭＡＧＮＥＴＩＣＩＭＡＧＩＮＧＳＣＨＥＭＥ①ＺｈａｎｇＲｏｎｇｆｅｎｇ，ＨｅＪｉｓｈａｎＣｏｌｅｇｅｏｆＲｅｓｏｕｒｃｅ，ＥｎｖｉｒｏｎｍｅｎｔａｎｄＣｉｖｉｌＥｎｇｉｎｅｒｉｎｇ，ＣｅｎｔｒａｌＳｏｕｔｈＵｎｉｖｅｒｓｉｔｙｏ...     

含H_2O气氛下Cu液中Ti的氧化SCIEI

本文研究了1500℃H_2O气氛下液态Cu合金中Ti的氧化。     

Study on the Components and Performance of GCrlS Bearing Steel Surface by Gas Multi-elements Penetrating

GAS multi-elements penetrating technology is a newsurface hardening technology developed on the basisof carbonitriding technology.It can not only shortenthe production period,but also improve the mechanicalperformances of the parts,such as torsional strength,flexural strength,wear resistance,and fatigue resistance"'.It features low-temperature multi-elementspenetration that the physical chemistry process ofoxidation-reduction generates the active atoms in thepart surface.In the beginning,the …     

SA-213T91/G102异种钢接头的焊材选用

对三种焊条焊接的SA－213T91与G102异种接头的组织与性能进行了对比性试验研究，认为对于电站锅炉中的这类接头焊接，采用R417作为焊材较为理想。     

MICROSTRUCTURE AND MECHANICAL PROPERTIES OF AN Al-Li-Cu-Mg-Zr ALLOY CONTAINING MINOR LANTHANUM ADDITIONS

The effect of the addition of minor amounts of La on the microstructure and mechanicalproperties of an Al-Li-Cu-Mg-Zr alloy was studied.The results showed that in Al-Li alloyssome impurities,such as Fe,Si and Na segregated on the grain boundaries,and the addition ofminor amounts of La decreased the segregation of these impurities.In addition,La could giverise to grain refinement,and retard the growth of precipitates.The tensile properties andtoughness of the Al-Li alloy containing minor amounts of La were improved compared with theLa-free Al-Li alloy.     

我国的静电喷涂枪技术评述

就我国涂装用各种静电喷枪技术的现状分别作出了阐述和剖析,对有关企业制造或安全使用静电喷涂枪有积极意义。