摘要
研究了正火处理对热轧态GCr15轴承钢组织和冲击性能的影响。结果表明:正火处理可以有效降低钢中的网状碳化物级别,并且随正火温度提高,网状碳化物级别持续降低;但是当正火温度为900℃时,钢中出现了大片呈条带分布的颗粒状碳化物,严重破坏了钢的组织均匀性,随正火温度升高,此类碳化物逐渐减少; 950℃时此类碳化物含量已较少,1000℃时基本消失。对钢的冲击性能测试表明,随正火温度升高,钢的冲击性能不断增加,其中900~950℃之间增幅较大,这与条带状碳化物的快速减少有关。
Effect of normalizing treatment on microstructure and impact property of hot-rolled GCr15 bearing steel was studied. The results show that the normalizing treatment can effectively recluce the grade of network carbides in the steel,and as the normalizing temperature increases,the level of network carbides continuously decreases. However,when the normalizing temperature is 900 ℃,a large number of strips distributed granular carbides appear in the steel,which seriously destroys the homogeneity of the steel. As the normalizing temperature increases,such carbides gradually disappear,when the temperature is 950 ℃,the content of these carbides is less,and it basically disappear at 1000 ℃. The test of impact property of the steel shows that with the increase of normalizing temperature,the impact toughness of steel increases continuously,among which the increase of ductility between 900-950 ℃ is relatively larger. It is considered that it is related to the rapid decrease of the particulate carbides distributed in strip.
引文
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