团球γ+(Fe,Mn)3C/γ自生复合材料强韧与耐磨机制

Strengthening/Toughness Match and Wear Resistance of Granular γ+(Fe,Mn)3C/γ In-situ Composites

  • 摘要: 在研究团球γ+(Fe,Mn)3C共晶体增强奥氏体钢基自生复合材料(EAMC)的力学与耐磨性能的基础上,分析了EAMC的强韧化及耐磨机理.结果表明,高硬度的团球共晶体与韧性奥氏体使EAMC具有优异的强韧性匹配;在低载工况下,共晶体在奥氏体基体的保护下可以有效阻碍亚表层中裂纹的扩展,加工硬化层中的硬度具有负梯度分布特征,从而减小EAMC磨损量;高载工况下共晶体在循环外力的作用下剥落,加重“三体”磨损,故EAMC耐磨性能随着共晶体的体积分数的增加而降低.

     

    Abstract: The performance of granular γ+(Fe,Mn)3C eutectics reinforced austenite steel matrix composites (EAMC) was studied, and the strengthening/toughness match and wear resistance were analyzed. The results show that hard granular eutectic particles and soft austenite matrix contribute to the strengthening/toughness match of EAMC. The wear resistance of EAMC under low normal load is because of that the eutectic particles under the protection of austenite matrix can delay effectively crack propagation on the subsurface in the process of sliding wear, and the micro-hardness in the strain hardened zone distributes in a negative gradient. The granular eutectic particles are flaked off at high normal load, which intensifies the triple body wear and increase the mass loss of EAMC.

     

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