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相变超塑性效应在热处理校直中的应用,已逐步为人们所重视。因其发生在相变晶格迁移的过程中,不论是在扩散型相变还是非扩散型相变中均存在,所以能解决在稳定组织中难以解决、甚至无法解决的校直问题。而且这种动态塑性要比普通退火(正火)态的塑性要高。因而是一种高效、节能的新工艺。高硬度整体淬火细长轴在热处理后的校直颇为困难,我们曾采取了不少办法,均未达到满意的结果。最后,经过反复试验,制定了利用奥氏体向马氏体转变过程中的超塑性、及回火转变过程中的超塑性效应
The application of phase transition superplasticity in heat treatment straightening has gradually been taken seriously by people. Because it occurs in the process of phase transition lattice migration, both diffuse phase transition and non-diffused phase transition exist, it can solve difficult to solve in the stable tissue, and even can not solve the alignment problem. And this kind of dynamic plasticity is higher than that of normal annealing (normalizing). So it is a new technology of high efficiency and energy saving. It is quite difficult to align the high-hardness whole-hardened slender shafts after heat treatment. We have taken a number of measures and have not achieved satisfactory results. Finally, after repeated experiments, the development of the superplasticity during the transformation from austenite to martensite and the superplastic effect during the tempering transformation