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本文研究了热循环对Cu-Zn-Al合金马氏体相变的影响,其中包括热循环对相变热滞、转变特征温度及马氏体形貌的影响。由电阻-温度曲线表明M_s和A_f温度随热循环次数增加而升高;但M_f和A_s温度则保持不变。还可看到参加热循环的马氏体量随循环次数增加而减少。在300次左右达到饱和。用金相和电子显微镜研究了马氏体转变形貌的变化。发现淬火后马氏体的生长和收缩以两种方式同时进行,即连续式和爆发式两种。经过60次热循环后马氏体生长和收缩均以阶梯式分步进行。
In this paper, the effects of thermal cycling on martensitic transformation of Cu-Zn-Al alloys were investigated, including the effect of thermal cycling on the phase transition thermal hysteresis, the transition temperature and martensite morphology. The resistance-temperature curves show that the temperatures of M_s and A_f increase with the increase of thermal cycles, but the temperatures of M_f and A_s remain unchanged. It can also be seen that the amount of martensite participating in the thermal cycle decreases as the number of cycles increases. Saturated around 300 times. The changes of martensitic transformation morphology were studied by metallography and electron microscopy. It is found that the growth and shrinkage of martensite after quenching are carried out simultaneously in two ways, namely, continuous and explosive modes. Martensite growth and contraction after 60 thermal cycles were all stepped in steps.