热处理过程中铌对高铬钢组织性能影响.pdf

学兔兔 Jun．2010 铸 造 VOI．59 NO．6 FOUNDRY 热处理过程中铌对高铬钢组织性能的影响 张宇光，赵爱民，赵征志，王艾青，唐 狄 (北京科技大学冶金工程研究院，北京100083) 摘要：研究了热处理工艺对新型高铬钢硬度和冲击性能的影响，并分析了含Nb新型高铬钢经过不同热处理后的组织。 结果表明，Nb增加了合金碳化物的稳定性，在高铬钢加热奥氏体化过程中阻碍了碳化物的溶解。其最佳奥氏体化温度 为1 070～1 100℃，比传统D2钢 (Crl2MolV1)提高了约100℃。Nb细化了晶粒，改善了高铬钢的韧性。在降低少量硬 度的情况下，冲击韧性提高了1倍。 关键词：热处理；高铬钢；铌；硬度；碳化物；冲击韧性 中图分类号：TG142．1__3 文献标识码：A 文章编号：1001—4977(2010)06—0611—03 Influence of Nb On Performances and Microstructure of High ChrOmium SteeIby Di仟erent Heat Treatment ZHANG Yu-guang，ZHAO Ai-min，ZHAO Zheng—zhi，WANG Ai—qing，TANG Di (Research Institute of Metallurgy Engineering，University of Science and Technology Beijing， Beijing 1 00083，China) Abstract：The effects of heat treatment process on the hardness and impact toughness of new high chr0mium stee1 were studied in this paper．and its micrOstructure was analyzed as wel1．The experimental results show that niobium enhances the stability of alloy carbide， and delays dissolution of carbide in high chrOmium steel during its austenitizing．The best austenitizing temperature of the test steel is 1 070—1 1 00。C．which is increased by 1 00。C compared with that of common D2 steeI(Cr12Mo1V1)．The results also show that niobium can refine the crystal grain． and enhance the impact toughness of high chromium steeI to two times higher than D2 stee1 with only a little hardness decrease． Key words：heat treatment；high chrOmium steel；niobium；hardness；carbide；impact toughness Cr12型钢是国内最常用的冷作模具钢之一。提高 用十字锻造法锻造成圆锭。试样用线切割在锻造后的圆 模具的质量，延长模具的寿命，直接和间接带来的经 锭上截取，加工成10 mmxl0 mmx55 mm无缺口试样， 济效益和社会效益是难以估量的。由于高铬钢含有大 在RJx