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本文采用TEM薄膜原位拉伸变形试验连续观察了Mn8钢变形过程中形变诱发马氏体的形核与长大以及位错组态的动态变化过程,并结合微区成分测定和价电子结构理论计算,对试验现象的本质从电子和原子角度进行了分析说明.1 方法试验材料采用DZG-0.01真空感应电炉熔炼,铸铁模浇注.其化学成分(质量比)为C:1.21,Mn:8.18,Si:0.24,S:0.039,P:0.015.试样经1050℃,2h的固溶处理后淬入水中,获得的组织为单一奥氏体.用H-800透射电子显微镜进行薄膜原位动态拉伸变形试验,其拉伸速度为2μm/s,拉伸力为1kg,最大拉伸量为2.5mm,加速电压为200kV;用EDAX9900型X射线能量谱仪分析试样微区成分.
In this paper, the in-situ tensile deformation test of TEM film was used to observe the dynamic process of deformation-induced martensite nucleation and growth as well as the dislocation configuration in the deformation process of Mn8 steel. Combining the determination of micro-composition and valence electron structure theory Calculation, the nature of the test phenomenon from the electronic and atomic point of view to illustrate the analysis.METHODS The method of test materials using DZG-0.01 vacuum induction electric furnace casting, cast iron mold.The chemical composition (mass ratio) C: 1.21, Mn: 8.18, Si: 0.24, S: 0.039, P: 0.015. The samples were quenched into water after solution treatment at 1050 ℃ for 2h, and the obtained microstructure was single austenite. The films were dynamically pulled by H-800 transmission electron microscope Stretching deformation test, the tensile speed of 2μm / s, stretching force of 1kg, the maximum stretch of 2.5mm, acceleration voltage of 200kV; EDAX9900 X-ray energy spectrometer analysis of the composition of the micro-zone.