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研究了一次淬火马氏体对低合金钢经淬火和配分(Quenching and Partitioning,Q&P)工艺后微观组织和单轴拉伸性能的影响,用扫描电镜进行微观组织表征,用X射线法测量残留奥氏体量。试验结果表明,随着一次淬火马氏体比例的增加,二次淬火马氏体的尺寸和数量逐渐减少,残留奥氏体体积分数呈先增加后减少的趋势,一次淬火马氏体体积分数为40%时获得最大残留奥氏体体积分数为16.92%。一次淬火马氏体体积分数为30%~70%时试验钢获得了较高的塑性和强塑积,马氏体基体为钢提供了高强度,残留奥氏体在变形过程中的TRIP效应提高了钢的塑性。
The effects of quenched martensite on the microstructures and uniaxial tensile properties of low alloyed steel after quenching and Quining and Partitioning (Q & P) were studied. The microstructure was characterized by scanning electron microscopy (SEM) and the residual austenite Volume of body. The results show that with the increase of the ratio of primary quenched martensite, the size and number of secondary quenched martensite gradually decrease and the retained austenite volume fraction first increases and then decreases. The volume fraction of primary quenched martensite is At 40%, the maximum retained austenite volume fraction was 16.92%. When the volume fraction of quenched martensite is 30% ~ 70%, the high ductility and plasticity are obtained in the test steel. The martensite matrix provides high strength for the steel and the residual austenite improves the TRIP effect during the deformation The plasticity of steel.