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材料工程  2015 

变形终止温度对GCr15轴承钢显微组织的影响

DOI: 10.11868/j.issn.1001-4381.2015.10.005, PP. 28-34

Keywords: GCr15轴承钢,变形终止温度,珠光体,网状碳化物,片层间距

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Abstract:

采用MMS300热模拟试验机对GCr15轴承钢的热变形工艺进行模拟,研究变形终止温度对其显微组织的影响。结果表明,变形终止温度在770~870℃内变化时,其显微组织均为片层状珠光体+沿晶界分布的先共析碳化物,并且先共析碳化物周围存在铁素体薄膜。随着变形终止温度的升高,晶粒尺寸和珠光体团的尺寸均增加,珠光体的片层间距略微减小,硬度增加。通过回归分析获得维氏硬度与片层间距倒数的拟合方程HV=38.3S-1+92.7。变形终止温度在810~870℃内升高时,碳化物的网状程度增加。与810℃相比,变形终止温度为770℃和790℃时,碳化物的网状程度较严重。

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