热处理工艺对建筑高强钢耐延迟断裂性能的影响  

Impacts of Heat Treatment Process on Delayed Fracture Resistance Properties of High Strength Construction Steel

作　　者：李小娟[1] 白香鸽 贾立术 

机构地区：[1]黄淮学院建筑工程系,河南驻马店463000 [2]河南工业和信息化职业学院,河南焦作454000

出　　处：《热加工工艺》2017年第6期213-216,共4页Hot Working Technology

摘　　要：采用不同的退火温度和淬火工艺、相同的回火工艺对Q390建筑高强钢进行了热处理,并进行了拉伸试验和延迟断裂试验。结果表明:随退火温度从870℃提高到990℃或淬火温度从850℃提高到950℃,建筑高强钢的耐延迟断裂性能先提高后下降;等温退火和分级淬火能更好地提高建筑高强钢的耐延迟断裂性能。与850℃×60 min常规淬火相比,900℃×40 min+400℃×20 min分级淬火的建筑高强钢在0.75倍抗拉强度恒定载荷下的延迟断裂时间延长190%;在0.65倍抗拉强度恒定载荷下的延迟断裂时间延长162%。退火工艺优选为930℃×0.5 h+720℃×1.5 h等温退火,淬火工艺优选为900℃×40 min+400℃×20 min分级淬火。The heat treatment of Q390 high strength construction steel was carded out by using different annealing temperatures and quenching processes as well as the same tempering processes. And the tensile and delayed fracture experiments were carried out. The results show that with the annealing temperature from 870 ℃ to 990 ℃ or quenching temperature from 850 ℃ to 950 ℃, the delayed fracture resistance properties of high-strength construction steels firstly increase and then decrease; isothermal annealing and step quenching can better improve the delayed fracture resistance properties of high-strength steel. Compared with conventional quenching of 850 ℃ ×60 min, the delayed fracture time of high strength construction steel under step quenching of 900 ℃ ×40 min＋400 ℃ ×20 min extends by 190% under constant load of 0.75 times of the tensile strength, and extends by 162% under constant load of 0.65 times of the tensile strength. The annealing process is preferable isothermal annealing of 930 ℃ ×0.5 h＋720 ℃ ×1.5 h, while the quenching process is preferable step quenching of 900 ℃ ×40 min＋400 ℃ ×20 min.

关 键 词：热处理工艺 等温退火 分级淬火 耐延迟断裂性能 高强钢建筑 

分 类 号：TG156[金属学及工艺—热处理]