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针对GCr15轴承钢棒材网状碳化物大量析出、网状级别超标问题,通过热模拟试验对碳化物析出机理进行研究。结果表明,GCr15轴承钢试样经热轧后的连续冷却过程中,在晶界处析出的二次碳化物为(Fe.Cr)3C型碳化物,冷却速度对晶界处二次碳化物形貌具有重要影响,随冷却速度的增加,可达到抑制网状碳化物析出并得到高品质轴承钢棒材的目的。
In view of the large amount of precipitated network carbides of GCr15 bearing bar steel and the problem of excessive mesh grade, the precipitation mechanism of carbides was studied through thermal simulation test. The results show that the secondary carbides precipitated at the grain boundaries are (Fe.Cr) 3C carbides precipitated in the GCr15 bearing steel during the continuous cooling after hot rolling. The cooling rate affects the secondary carbides Appearance has an important influence, with the increase of cooling rate, can inhibit the mesh carbide precipitation and obtain the purpose of high quality bearing steel bar.