回火工艺对超快冷Q550E钢板组织和性能的影响  

Effects of tempering process on microstructure and properties of Q550E steel by ultra fast cooling

作　　者：王东梅[1] 张朋彦[1] 朱伏先[1] 杨云清[2] 

机构地区：[1]东北大学材料与冶金学院,辽宁沈阳110819 [2]湖南华菱湘潭钢铁有限公司技术中心,湖南湘潭411101

出　　处：《材料热处理学报》2013年第12期103-107,共5页Transactions of Materials and Heat Treatment

基　　金：国家自然科学基金重点项目(50834010)

摘　　要：研究不同回火工艺对厚度为16—40mm由超快冷工艺生产的低碳低合金Q550E钢板组织和力学性能的影响。利用光学显微镜和透射电镜分析了试验钢的显微组织，通过拉伸和冲击试验测试了试验钢的力学性能。结果表明：随着回火温度提高，不同厚度试验钢力学性能均呈现非单调性变化趋势，整体强度呈现先上升后下降、伸长率呈现先下降后上升的趋势；冲击性能相对稳定；采用Q550E生产16—30mm厚度规格钢板时，在520～640℃回火温度范围内均能得到力学性能满足国标GB/T1591—2008要求的产品。Effects of tempering process on microstructure and mechanical properties of Q550E steel with different thickness manufactured by ultra fast cooling （UFC） process were investigated. Microstructure of the experimental steel was analyzed by means of optical microscope and transmission electron microscopy. Mechanical properties of the experimental steel were tested by tensile and impact tests. The results indicate that mechanical properties of the tested steel plate with different thickness show a non-monotonic changing feature with increasing tempering temperature. The general trend is that the strength gradually increases and then decreases while the elongation firstly decreases then increases as the tempering temperature increases, and impact energy is of no fluctuation. The tested steel plate with 16 - 30 mm thickness can satisfy the GB/T 15 91 - 2008 specifications when the tempering temperature is in the range of 520 to 640 ℃.

关 键 词：回火温度 组织 力学性能 超快冷(UFC) 

分 类 号：TG156.5[金属学及工艺—热处理]