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柯俊和Cottrell在1952年首先观察到贝氏体相变伴随有与马氏体相似的表面浮突,故认为贝氏体的长大方式与马氏体相似,这一实验结果成为贝氏体相变以切变机制完成的重要证据之一.但有人发现扩散型相变(如Al-Ag中的γ相沉淀)也能产生表面浮突,而且贝氏体浮突的形状(∧,∨型)与马氏体单倾型浮突(N型)有所不同,认为不能根据浮突效应来肯定贝氏体的切变形成机制.而后,许多学者对贝氏体浮突的形状和本质进行了大量的研究,但至今为止,关于浮突的实验工作大都是用光学干涉显微镜完成的,高度观察只能达到(0.01μm)的精
Ke Jun and Cottrell first observed in 1952 bainite transformation accompanied by similar martensite surface bumps, so that the growth of bainite and martensite similar to the experimental results of bainite phase However, it has been found that diffusion-type phase transitions (such as γ-phase precipitates in Al-Ag) also produce surface bursts and that the shape of the bainite bump (∧, ∨ ) Is different from that of martensite single dip type (N type), and it is considered that the mechanism of shear formation of bainite can not be affirmed by the buoyancy effect.After that, many scholars make the shape and essence of bainite bump A great deal of research has been done, but up to now, most of the experimental work on buoyancy has been done by using optical interference microscope. The height of the experiment is only 0.01μm