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團球γ+(Fe,Mn)3C/γ自生復合材料強韌與耐磨機制

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

  • 摘要: 在研究團球γ+(Fe,Mn)3C共晶體增強奧氏體鋼基自生復合材料(EAMC)的力學與耐磨性能的基礎上,分析了EAMC的強韌化及耐磨機理.結果表明,高硬度的團球共晶體與韌性奧氏體使EAMC具有優異的強韌性匹配;在低載工況下,共晶體在奧氏體基體的保護下可以有效阻礙亞表層中裂紋的擴展,加工硬化層中的硬度具有負梯度分布特征,從而減小EAMC磨損量;高載工況下共晶體在循環外力的作用下剝落,加重“三體”磨損,故EAMC耐磨性能隨著共晶體的體積分數的增加而降低.

     

    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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