GCr18Mo钢制轴承经贝氏体等温淬火后,可以获得比马氏体淬回火更优越的力学性能,被广泛应用于一些要求承受较高的冲击载荷的工作环境。某批次GCr18Mo钢制圆柱轴承外圈,外径尺寸为250 mm,经下贝氏体等温淬火后,在产品的检验过程中,发现该批次产品的外径尺寸涨缩规律出现反常:外圈留量涨大正常约为0.60~0.80 mm,而该批产品外径的涨大留量偏小。为了查清产生这一现象的原因,对热处理加 GCr18Mo steel bearing isothermal quenching bainite, martensitic quenching and tempering can get more superior mechanical properties, is widely used in some require higher impact load to withstand the work environment. A batch of GCr18Mo steel cylindrical bearing outer ring, the outer diameter of 250 mm, after bainite austempering, in the product testing process and found that the batch size of the outer diameter of the law of contraction anomalies: outside Rings to keep up the normal increase of about 0.60 ~ 0.80 mm, while the large diameter of the batch of products to stay small. In order to find out the reasons for this phenomenon, the heat treatment plus