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    热轧变形量对Fe-18Mn合金显微组织和阻尼性能的影响

    Effect of Hot Rolling Deformation on Microstructure and Damping Properties of Fe-18Mn Alloy

    • 摘要: 对退火态Fe-18Mn合金进行不同变形量(5%~22%)的热轧,通过X射线衍射、扫描电镜、透射电镜以及动态热机械分析仪表征物相组成、显微组织和阻尼性能,研究了热轧变形量对合金组织与阻尼性能的影响。结果表明:热轧前后试验合金均主要由ε马氏体、α´马氏体和奥氏体组成,但热轧后更多奥氏体向ε马氏体转变,使ε马氏体含量增加,奥氏体含量减小;热轧后三相含量随变形量增加无明显变化,但阻尼因子降低。变形量5%热轧后,ε马氏体层错、奥氏体层错和ε马氏体/γ奥氏体界面的贡献降低是阻尼性能相比于热轧前降低的主要原因;当热轧变形量从5%增加至22%后,ε马氏体中层错的贡献降低是阻尼性能进一步降低的原因之一。

       

      Abstract: Anneal Fe-18Mn alloy was hot rolled with different deformations (5%–22%). The phase composition, microstructure and damping properties were characterized by X-ray diffraction, scanning electron microscope, transmission electron microscope and dynamic thermomechanical analyzer. The effect of hot rolling deformation on the microstructure and damping properties of the alloy was studied. The results show that the test alloy consisted by ε martensite, α´ martensite and austensite before and after hot rolling. But there were more austensite change to ε martensite after hot rolling and the content of ε martensite increased, the content of austensite decreased. With the increase of deformation, the content of three phase in the test alloy didn´t change obvioushy, but the damping factors decreased. After hot rolling with deformation of 5%, the contribution of ε martensite, austenite and ε martensite /γ austenite interface decreased, which was the main reason for the decrease of damping performance comparing with those before hot rolling. When the rolling deformation increased from 5% to 22%, the contribution of ε martensite intermediate fault decreased, which was one of the reasons for the further decrease of damping performance.

       

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