轧后冷速对调质态含Cu高强钢组织性能的影响
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摘要
通过轧后分别采用快冷和慢冷的两种不同冷却方式,对调质态含Cu高强HSLA钢的微观组织和力学性能的差异进行了研究。利用OM、SEM、TEM等设备对HSLA钢轧后不同冷却方式下的微观组织进行了表征,并对其拉伸性能和低温韧性进行了测定。结果表明,相对于轧后空冷,轧后快冷后钢的组织得到细化,有效晶粒尺寸较小,组织得到遗传,从而快冷后钢经过调质后钢的强度较高,低温韧性更好,而且快冷后抑制了钢的冲击断口中的裂开流线的出现。
Differences of microstructures and mechanical properties of quenched and tempered HSLA steel containing Cu were studied by using two different cooling methods of quick cooling and slow cooling after rolling. Microstructure of HSLA steel under different cooling modes after rolling was characterized by OM,SEM and TEM,and its tensile properties and low temperature toughness were measured. The results show that compared with air cooling after rolling,the structure of the fast-cooling steel cooling after rolling was refined,the effective grain size was finer,and the microstructure was inherited,so the steel after quenching and tempering has higher strength and better low temperature toughness. Moreover,the layered fracture in impact fracture of steel was restrained after rapid cooling.
Differences of microstructures and mechanical properties of quenched and tempered HSLA steel containing Cu were studied by using two different cooling methods of quick cooling and slow cooling after rolling. Microstructure of HSLA steel under different cooling modes after rolling was characterized by OM,SEM and TEM,and its tensile properties and low temperature toughness were measured. The results show that compared with air cooling after rolling,the structure of the fast-cooling steel cooling after rolling was refined,the effective grain size was finer,and the microstructure was inherited,so the steel after quenching and tempering has higher strength and better low temperature toughness. Moreover,the layered fracture in impact fracture of steel was restrained after rapid cooling.
引文
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[2]Ghosh S K,Haldar A,Chattopadhyay P P.Effect of pre-strain on the ageing behavior of directly quenched copper containing micro-alloyed steel[J].Materials Characterization,2008,59(9):1227.
[3]SHI X B,YAN W,WANG W,et al.Novel Cu-bearing highstrength pipeline steels with excellent resistance to hydrogen-induced cracking[J].Mater and Design,2016(92):300.
[4]张正延,柴锋,罗小兵,等.调质态含Cu高强钢的强化机理及钢中Cu的析出行为[J].金属学报,2019,55(6):783.
[5]刘东升,陈丙贵,陈圆圆.低C含Cu NV-F690特厚钢板的精细组织和强韧性[J].金属学报,2012,48(3):334.
[6]吴石新,陈登福,汪勤政,等.钛微合金钢连铸中TiN与Ti C析出热力学研究[J].连铸,2019,44(1):28.
[7]屈天鹏,王德永,徐周,等.含Nb-Ti微合金钢连铸过程中TiN析出行为研究[J].连铸,2019,42(2):32.
[8]李立铭,冯运莉,杨丽娜,等.钛微合金化高强钢含Ti第二相的热力学计算[J].钢铁钒钛,2019,40(1),118.
[9]杨婷,苏航,罗小兵,等.淬火工艺对HSLA钢板截面精细组织结构的影响[J].材料研究学报,2017,31(9),650.
[10]罗小兵,杨才福,苏航,等.时效温度对HSLA高强船体钢组织和性能的影响[J].材料热处理学报,2011,32(6),73.