热循环对Fe-19Mn阻尼合金组织和性能的影响
Effect of Thermal Cycling on Microstructure and Properties of Fe-19Mn Damping Alloy
黎 为, 李 宁, 滕 劲, 文玉华
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作者单位：四川大学 制造学院材料成型系, 四川 成都 610065
中文关键字：Fe-19Mn合金； 热循环； 阻尼性能； ε马氏体
英文关键字：Fe-19Mn alloy; thermal cycling; damping capacity; ε martensite
中文摘要：采用Olympus光学显微镜XRD以及倒扭摆法，研究了热循环温度对Fe-19Mn合金的微观组织和阻尼性能的影响。结果表明，当热循环温度在As以下时，ε马氏体形貌基本保持不变，由于淬火空位的浓度降低，阻尼性能提高；当热循环温度在As与Af之间，合金内马氏体明显粗大，减少了合金阻尼源界面，阻尼性能降低；当热循环温度高于Af时，由于反复的ε ?圮γ相变过程，导致马氏体形貌的明显改变，进而影响到合金的阻尼性能，随循环温度的提高，合金的马氏体形貌和阻尼性能都逐渐恢复到固溶态水平。
英文摘要：The effects of thermal cycling temperature on microstructure and damping capacity of Fe-19Mn alloy were studied by Olympus optical microscope, XRD and reversal torsion pendulum. The results show that, when upper peak temperature is below As, the damping capacity is improved due to quenched-vacancy decaying. When upper peak temperature is between As and Af, because ε martensite plates become wider, the interface phase between ε martensite decreases, which reduces damping capacity dramatically. When upper peak temperature is above Af, the morphology of the alloy greatly changes owing to the repetition of ε ?圮 γ, which alters the damping capacity of the alloy. With the increase of temperature, the morphology of martensite and damping capacity of the alloy return to as-quenched gradually.