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。
The hot deformation process of GCr15 bearing steel was simulated by the MMS300 thermal mechanical simulator.The effect of final deformation temperature on microstructure was investigated. The results show that,within the range of 770-870℃,the microstructure of GCr15 bearing steel con-sists of lamellar pearlite plus proeutectoid carbide which is distributed along the grain boundary and surrounded by ferrite thin film.With the increase of the final deformation temperature,the grain size and pearlite colony size both increase,the mean interlamellar spacing of pearlite decreases slightly and the hardness increases.By means of regression analysis,the fitted curve of Vickers hardness vs the re-ciprocal of mean interlamellar spacing is given by HV=38.3S -1 +92.7.The degree of carbide net-work increases when the final deformation temperature increases within the range of 810-870℃.Com-pared with 810℃,the degree of carbide network is more serious at the final deformation temperature of 770℃ and 790℃.
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