淬火分配工艺对低碳低合金钢组织与性能的研究

Study of Quenching and Partitioning Process on the Microstructure and Mechanical Properties of Low-carbon and Low-alloy Steel

研究了0.15C-Mn-Si-Cr低碳低合金钢在Ms点以下不同温度预淬火-碳分配工艺(Q&P工艺)及贝氏体转变对钢组织与性能影响。结果表明,实验钢经Q&P处理后获得贝氏体/马氏体复相组织,与淬火回火钢相比能获得更多的残余奥氏体量,随着淬火碳分配温度的升高,钢中残余奥氏体量增加,等温温度超过310℃后,钢中析出碳化物,残余奥氏体量减少。在250℃预淬火温度等温碳分配淬火,钢的冲击韧性显著高于传统的淬火回火钢。

The effect of quenching and partitioning （Q＆P） process with different partitioning temperature below Ms and bainite transformation on the microstructure and mechanical properties of 0. 15C-Mn-Si-Crlow-carbon and low- alloy steel were investigated. The results showed that the bainite and martensitemixed microstructure is obtained by Q＆P process.With the increase of the partitioning temperature, the volume fraction of retained austenite increases and the volume fraction of retained austenite decreases due to the precipitation of carbides when the partitioning temperature is higher than 310 ℃.A highervolume fraction of retained austenite can be obtained than the traditional quenching and tempering （QT） steel. The toughness of the steel quenched and partitioned at 250 ℃has been im- proved significantlycompared with the traditional QT steel.