220 MPa级烘烤硬化钢的组织和力学性能研究
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摘要
研究了连续退火温度对220 MPa级烘烤硬化钢组织和性能的影响。试验结果表明:提高退火温度,促进了铁素体晶粒长大,加快了NbC的回溶以及析出物聚集长大,使得析出强化作用降低,钢板的屈服强度降低,塑性应变比r值升高。随着退火温度的升高,铁素体内固溶C原子数量增加,对位错的钉扎作用增强,钢板的烘烤硬化值上升。随着预变形量的增加,钢板内位错密度增大并产生大量的Cottrell气团,使得钢板的屈服强度升高,烘烤硬化值增加。
The effects of continuous annealing temperature on the microstructure and mechanical properties of 220 MPa bake hardening steel were investigated. The results show that, with the increase of continuous annealing temperature, the yield strength decreases and the plastic strain ratior value increases because of the growth of ferrite grains, dissolving of NbC, and coarsening of precipitates. The amount of free C atoms increases with the increase of annealing temperature, resulting in the increase of pinning effect on dislocation and the bake hardening value. The density of dislocations and the amount of Cottrell atmospheres increase with the increase of the prestrain, leading to the increase of yield strength and bake hardening value of the steel.
The effects of continuous annealing temperature on the microstructure and mechanical properties of 220 MPa bake hardening steel were investigated. The results show that, with the increase of continuous annealing temperature, the yield strength decreases and the plastic strain ratior value increases because of the growth of ferrite grains, dissolving of NbC, and coarsening of precipitates. The amount of free C atoms increases with the increase of annealing temperature, resulting in the increase of pinning effect on dislocation and the bake hardening value. The density of dislocations and the amount of Cottrell atmospheres increase with the increase of the prestrain, leading to the increase of yield strength and bake hardening value of the steel.
引文
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[10]陈爱华,李化龙,李腾飞.连续退火温度对IF钢力学性能及织构的影响[J].金属热处理,2016,41(6):37-41.
[11]崔岩,王瑞珍,魏星,等.连续退火工艺对超低碳烘烤硬化钢烘烤硬化性能的影响[J].钢铁,2010,45(9):86-90.
[2]邝春福,张深根,李俊,等.烘烤硬化钢板的研究进展[J].材料导报,2013,27(5):92-95.
[3]江海涛,康永林,于浩.烘烤硬化汽车钢板的开发与研究进展[J].汽车工艺与材料,2005,20(3):1-7.
[4]王华,史文,李麟.超低碳烘烤硬化钢研究的进展[J].热处理,2010,25(3):12-17.
[5]吕成,胡吟萍,孙方义.不同成分体系对超低碳烘烤硬化钢性能的硬性[J].钢铁研究,2011,39(2):59-62.
[6]陈继平,钱健清,李胜祗,等.Ti+Nb和Ti+V超低碳烘烤硬化钢的组织和性能研究[J].材料工程,2012,57(4):32-35.
[7]关小军,周家娟,潘伟,等.Ti处理的ELC-BH钢板的析出物研究[J].钢铁,2002,37(7):50-53.
[8]陈继平,康永林,郝英敏,等.Ti和Ti+Nb处理的超低碳烘烤硬化钢连续退火研究[J].金属热处理,2009,34(9):52-58.
[9]康永林,陈继平,刘光明,等.汽车用冷轧超低碳烘烤硬化钢板的组织性能与析出[J].中国冶金,2008,18(3):14-21.
[10]陈爱华,李化龙,李腾飞.连续退火温度对IF钢力学性能及织构的影响[J].金属热处理,2016,41(6):37-41.
[11]崔岩,王瑞珍,魏星,等.连续退火工艺对超低碳烘烤硬化钢烘烤硬化性能的影响[J].钢铁,2010,45(9):86-90.