共查询到17条相似文献,搜索用时 52 毫秒
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应用光学显微术及透射电子显微术和B-M表象晶体学理论对60和60Si2Mn钢中马氏体的形态、亚结构与晶体学特征进行了研究。中碳铁基马氏体的平均惯习面为{225}_f。铁基马氏体的微观惯习面为{111}_f。实测惯习面、取向关系及切变方向等与利用Bain应变及(100)[011]_f点阵不变切变系按B-M理论计算的结果一致。 相似文献
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自20世纪20年代以来,基于马氏体相变产生的浮凸和在母相中预先刻制的直线变成在相界面上连续的折线,提出了以切变为基础的马氏体相变的晶体学特征—"不变平面应变"的概念。随后,以该概念为基础建立了马氏体相变晶体学表象理论(PTMC)。然而,刘宗昌等基于相同的实验,即马氏体相变后的直线刻痕仍为直线和浮凸形态为帐篷形,分别在2010年和2013年《热处理》杂志上发表文章,否定马氏体相变的"切变"机制进而否定马氏体相变的"不变平面应变"。如所周知,否定马氏体相变的"切变机制"就是否定"不变平面应变",因此刘宗昌等于2013年发表的文章彰显出他们的轻率。本文作者已在3篇文章中列举用原子力显微镜和透射电镜观察的结果驳斥了他们的错误观点,至少可以说,他们没有理解我们文章中的实验和理论。为此,本文再次引用Yang和Wayman的透射电镜实验结果,即单变体马氏体使预存在的层错迹线(直线)变成折线,而自协调的多个马氏体可使迹线仍为直线;单变体马氏体的浮凸为N形,但多变体马氏体的浮凸可以是帐篷形或更为复杂的形态,由此可以说明刘宗昌等错误观点的原因。最近,本文作者及其合作者基于PTMC计算了Mn80Fe15Cu5热弹性合金马氏体相变的惯习面,并与实验结果相符,由此确认了"不变平面应变"是马氏体相变晶体学特征的正确性。 相似文献
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基于界面错配可以通过一组缺陷松弛的假设, 发展了一种简易矢量分析法来计算界面包含一组缺陷的系统的相变晶体学. 通过该方法可以方便地求解惯习面的取向. 本文运用该方法求解了fcc/bcc系统中经典马氏体表象理论对应的相变晶体学, 所有计算结果与文献报道完全一致. 并根据矢量分析方法求解了满足上述假设条件惯习面取向的一般表达式. 这一结果对系统地研究fcc/bcc中无理取向的惯习面提供了简便的分析工具. 相似文献
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马氏体相变的动态观察 总被引:2,自引:1,他引:2
用Cu-l4Al-4Ni(wt.-%)记忆合金粗大单晶,在光学显微镜上配上偏光、干涉、相衬等附件,使不同取向的马氏体显示出不同的色彩,研究了马氏体→母相及母相→马氏体的动态转变过程,发现马氏体相变过程的形式不是单一的,并显示了一些鲜为人知的、马氏体相变过程的细节。 相似文献
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LIU Yumen WU Shanghua Xi''''an Jiaotong University Xi''''an China LIU Yumen Department of Materials Science Engineering Xi''''an Jiaotong University Xi''''an China 《金属学报(英文版)》1989,2(2):108-112
Some characteristics of plate martensite in a 1.03% C ferroalloy have been studied by usingthe transmission electron microscopy.The habit plane of the plate martensite in this ferroalloywas found to be close to{224}_f.The morphology,distribution,coalescence and curving ofmartensite as well as the substructure in both martensite and austenite have been observed.The mechanism of both nucleation and growth of the martensite have been discussed. 相似文献
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ZHONG Jiaxiang QI Yan Beijing Institute of Technology Beijing ChinaZHANG Xiumu GUO Yunyi Institute of Metal Research Academia Sinica Shenyang China Beijing Institute of Technology Beijing China 《金属学报(英文版)》1991,4(2):86-90
A new “mid-relief” plate martensite was observed together with lenticular plate and thin plate martensites in Fe-29.37Ni-0.34C alloy after twice stepped cooling:-100/-120℃, -120/-140℃,-155/-165℃ and -165/-196℃,by means of colour metallography and TEM.The morphology of martensites changes with decreasing M_s temperature.The “mid-relief” plate martensite is characterized by the intensive mid-relie and the substructures of symmetric double twins or half twins and half dislocations,the formation of this martensite can be interpreted by a stress-induced co-generated mechanism. 相似文献
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LIU Yumen HE Zhirong Xi''''an Jiaotong University Xi''''an China Professor Dept.of Materials Science Engineering Xi''''an Jiaotong University Xi''''an China 《金属学报(英文版)》1989,2(5):364-367
The morphologic,substructural and crystallographic characteristics of martensite in steels 60and 60Si2Mn have been investigated by means of optical and transmission electronmicroscopy combined with B-M phenomenological crystallographic theory.The average hab-it plane of martensite in medium carbon iron alloys is{225}_f.Experimental data on the habitplane and the orientation relationship between the austenite and martensite are in agreementwith the B-M theoretical calculation of using the Bain strain and lattice invariant shear on(100)[011]_f. 相似文献
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Liu Zhengyi Fu Jian Zhuang Yuzhi South China University of Technology Guangzhou China Correspondent:LIU Zhengyi professor Dept.of Mechanical Engineering No. South China University of Technology Guangzhou China 《金属学报(英文版)》1990,3(1):35-39
The nature of“white layer”found in 55SiMnMo steel subjected to friction test has been stu-died using TEM,SEM,X-ray diffraction and EPMA techniques.It is shown that the struc-ture of the“white laver”on the rubbing surface is duplex,consisting of a special martensiteand some austenite.This layer may be 25—50 μm thick.It is ultrafine,with grain diametricapproximately 30 nm.Its micro-hardness may be as high as Hm 1500 and is capable of cut-ting glass.It has superb corrosion resistance and resists tempering.Its mierostructure andhardness undergo changes only when the steel is tempered above 500℃. 相似文献
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ZHU Min YANG Dazhi Dalian University of Technology Dalian China Lecturer Dept.of Matedais Engineering Dalian University of Technology Dalian China 《金属学报(英文版)》1989,2(5):377-379
A new kind of planar defect named non-basal plane stacking faults has been studied by usingtrace analysis and lattice image techniques.It has been found that they are located in(125)_M plane of martensite lattice.By lattice image observation,the non-basal plane stack-ing faults are argued to be induced by two incomplete basal plane stacking faults and may bethe results of rapid quenching.The defects are regarded as anomalous structures ofmartensite. 相似文献