热处理对高强建筑钢组织和性能的影响  

Effect of Heat Treatment on Microstructure and Properties of High Strength Construction Steel

作　　者：王永先[1] 马军霞[1] 

机构地区：[1]河北工程技术学院工程管理学院,河北石家庄050091

出　　处：《热加工工艺》2016年第22期217-219,222,共4页Hot Working Technology

基　　金：河北省人力资源和社会保障厅项目(JRS-2015-3054)

摘　　要：对试验钢进行了不同的两相区直接淬火+回火处理。对试样显微组织进行了观察,并对力学性能进行了检测,研究了淬火温度和回火温度对试验钢组织和性能的影响。结果表明,钢板回火显微组织以多边形铁素体+岛状回火马氏体为主。随着直接淬火温度的升高,回火马氏体含量增加,铁素体含量减少,组织中少量珠光体逐渐转变为贝氏体;屈服强度和抗拉强度均升高,屈强比先保持恒定后有所升高,伸长率逐渐下降,冲击功则是先大幅降低后几乎不变。当回火温度低于400℃时,马氏体形态没有明显改变;当回火温度超过500℃时,马氏体岛开始分解,碳化物析出量增加。随着回火温度升高,抗拉强度几乎呈线性降低,屈服强度则先升高后降低,屈强比升高,伸长率和冲击功先下降后提高。The different direct quenching in two-phase region ＋ tempering treatments of the test steel were carried out. The microstructure was observed, and the mechanical properties were tested. Effects of quenching temperature and tempering temperature on microstructure and mechanical properties of tested steels were studied. The results show that, tempered mierostructure of the steel plate mainly is polygonal ferrite ＋ tempered martensite island. With the increase of direct quenching temperature, tempering martensite content increases, the ferrite content decreases, and a small amount of pearlite in microstrueture gradually transforms into bainite; yield strength and tensile strength increase, the yield ratio keeps constant firstly and then increases, the elongation decreases gradually, and the impact energy greatly reduces firstly and then is almost unchanged. When the tempering temperature is below 400 ~C, the martensitic morphology has no apparent change; when tempering temperature is over 500 ~C, the martensite islands begins to decompose and carbide precipitations increase. With the increase of tempering temperature, the tensile strength almost decreases linearly, the yield strength increases firstly and then decreases, the yield ratio increases, and the elongation and impact energy decline firstly and then increase.

关 键 词：建筑钢 直接淬火 组织和性能 

分 类 号：TG156.3[金属学及工艺—热处理] TG156.5[金属学及工艺—金属学]