两相区保温及Q&P工艺对改善钢组织性能的分析  

Analysis of intercritical heat preservation and Q&P process of improvement of microstructure and properties

作　　者：陈辉[1] 景财年[1] 涂英明 张勇[1] 

机构地区：[1]山东建筑大学材料科学与工程学院,山东济南250101

出　　处：《山东建筑大学学报》2016年第3期244-248,共5页Journal of Shandong Jianzhu University

基　　金：山东省科技发展计划项目(2013GGX10306)

摘　　要：在普通的热连轧设备中,简化后的淬火—配分（Quenching ＆ Partitioning-Q＆P）工艺的应用可以获得性能更加优异的高强度钢,提高传统Q＆P工艺在实际生产中的可操作性以及改善热成形钢的力学性能。文章基于盐浴炉模拟了一步法Q＆P工艺,研究了两相区保温,不同配分温度及配分时间对0.24C-0.38Si-1.27Mn热成形钢组织与力学性能的影响。结果表明：经温度为770℃保温时间为120 s,并在300和340℃分别配分10～60 s后,显微组织主要为铁素体、板条马氏体及残余奥氏体,且该热成形钢的最佳配分温度和配分时间为300℃和60 s;而经300和340℃配分60 s后,断后伸长率和强塑积均得到了大幅度的提升;强塑积与断后伸长率之间的变化规律高度相似,断后伸长率对于强塑积的影响比抗拉强度的影响要大,通过提高断后伸长率来提高钢的强塑积更加有效。The paper provides an important theoretical and guidance significance for the application of simplify quenching and partitioning （Q＆P） process in hot continuous rolling equipment, which has contributed to obtain the high strength steel with more excellent performance. In order to improve the maneuverability of the traditional Q＆P process in practical production and improve the mechanical properties of hot stamping steel, a hot stamping steel （0.24C-0.38Si-1.27Mn） was treatment by salt bath furnace to simulate the one-step Q＆P process, and then the effects of intercritical heat preservation, partitioning temperature and partitioning time on the microstructure and mechanical properties of the hot stamping steel were studied. The results show that the main microstructure is ferrite, martensite and retained austenite when the hot stamping steel was heated preservation at 770 ℃for 120s, and partitioningl0s-60s at 300℃ and 340℃, respectively, the optimum partitioning temperature and partitioning time of the hot stamping steel are 300℃ and 60s; the elongation, the product of strength and elongation have been greatly improved at 300℃ and 340℃ partitioning 60s, respectively; the highly similar change regulation between the product of strength and elongation and the elongation show that the effect of elongation on the product of strength and elongation is greater than the tensile strength.

关 键 词：两相区保温 Q&P工艺 显微组织 力学性能 

分 类 号：TU996[建筑科学—供热、供燃气、通风及空调工程]