GCr15钢显微组织与力学性能的相关性定量分析

Quantitative Analysis of Relation Between Microstructure and Mechanical Properties of GCr15 Steel

在不同加热参数的情况下定量地测定并计算了 GCr15的马氏体含碳量、晶粒大小、碳化物体积分数和粒度 ,并进行了力学性能试验 ,结果表明 :当奥氏体化温度较低、加热时间较短、奥氏体晶粒细小时 ,强度、塑性和韧性均较高 ;在球化良好的情况下 ,未溶碳化物由于能比较好地细化奥氏体晶粒 ,从而提高了钢的强韧性 ,而本身的不良影响则不甚明显。热处理之后钢的硬度值并不仅仅取决于马氏体含碳量 。

Under different heat treatment, microstructure such as content of martensite, austenite grains size, carbonized content and its size are quantitated and calculated, at the same time, the value of mechanical properties is measured .The result shows that when the heating temperature is lower, heating time is shorter and austenite grains sizes are smaller, the strength, the tensile and impact properties are higher. Under the carbonizes are balled well, because they make austenite grains size smaller, they raise steel's strength and tensile properties while its bad action is not obvious. After heat treating steel's harden does not only depend on martensite carbon content,it results from synthesize factor .