退火和平整工艺对冷轧HSLA钢组织性能的影响
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摘要
本文以Nb微合金化冷轧HSLA钢为研究对象,探讨了退火和平整工艺对钢板组织性能的影响,结果表明:退火温度从700℃升至840℃,钢板的强度逐渐降低,伸长率逐渐升高,纤维状组织逐渐减少,铁素体再结晶更加充分;预拉伸量对带钢抗拉强度和断后伸长率无明显影响,随着预拉伸量提高至2. 0%,屈服强度略有升高,屈服点伸长率Ae逐渐减小,但预拉伸量达到2. 0%时,屈服平台仍无法消除;平整压下率对带钢抗拉强度和断后伸长率无明显影响,当压下率达到1. 0%时,屈服平台可完全消除,屈服平台消除后,随着压下率提高,规定塑性延伸强度R_(p_(0. 2))缓慢升高。
Effects of annealing and temper rolling on mechanical properties and microstructure of cold rolled HSLA sheet were studied. It is found that the strength decreases and elongation increases when the annealing temperature rises from 700 ℃ to 840 ℃. Pre-deformation and temper rolling have no effect on tensile strength and elongation. The yield strength increases slightly and yield point elongation Aedecreases with the increase of pre-deformation,and the yield platform could not be eliminated at the pre-deformation of 2. 0%. The temper reduction rate has no influence on tensile strength and elongation. When the reduction rate reaches 1. 0%,the yield platform can be completely eliminated. And then Rp_(0. 2) increases slowly with the increase of the reduction rate.
Effects of annealing and temper rolling on mechanical properties and microstructure of cold rolled HSLA sheet were studied. It is found that the strength decreases and elongation increases when the annealing temperature rises from 700 ℃ to 840 ℃. Pre-deformation and temper rolling have no effect on tensile strength and elongation. The yield strength increases slightly and yield point elongation Aedecreases with the increase of pre-deformation,and the yield platform could not be eliminated at the pre-deformation of 2. 0%. The temper reduction rate has no influence on tensile strength and elongation. When the reduction rate reaches 1. 0%,the yield platform can be completely eliminated. And then Rp_(0. 2) increases slowly with the increase of the reduction rate.
引文
[1]毛新平,高吉祥,李烈军,等.屈服强度550 MPa级高强度高成形性钢板的开发研究[J].汽车工艺与材料,2006,1(5):1-5.Mao Xinping,Gao Jixiang,Li Liejun,et al.Development and research of 550 MPa high strength and high formability plate[J].Automobile Technology and Material,2006,1(5):1-5.
[2]罗青,赵征志,赵爱民.600 MPa级冷轧高强钢性能及组织研究[J].热加工工艺,2008,37(22):9-12.Luo Qing,Zhao Zhengzhi,Zhao Aimin.Study on microstructure and properties of grade 600 MPa cold-rolled high strength steel[J].Hot Working Technology,2008,37(22):9-12.
[3]米振莉,潘殿军,江海涛.700 MPa冷轧低合金超高强钢的典型连续退火工艺[J].工程科学学报,2015,37(2):185-189.Mi Zhenli,Pan Dianjun,Jiang Haitao.Typical continuous annealing technology of cold-rolled 700 MPa ultra-high strength low-alloy steel[J].Chinese Journal of Engineering,2015,37(2):185-189.
[4]汤茜,李化龙.冷轧压下率和平整伸长率对低碳钢退火板组织性能的影响[J].金属热处理,2016,46(6):31-36.Tang Xi,Li Hualong.Effects of cold rolling reduction rate and flat extension rate on microstructure and properties of annealed low carbon steel sheet[J].Heat Treatment of Metals,2016,46(6):31-36.
[5]刘华赛,邝霜,谢春乾,等.退火温度和平整工艺对1000 MPa级双相钢组织和力学性能的影响[J].金属热处理,2017,42(8):98-101.Liu Huasai,Kuang Shuang,Xie Chunqian,et al.Influence of annealing temperature and temper rolling on microstructure and mechanical properties of 1000 MPa grade dual phase steel[J].Heat Treatment of Metals,2016,46(6):31-36.
[2]罗青,赵征志,赵爱民.600 MPa级冷轧高强钢性能及组织研究[J].热加工工艺,2008,37(22):9-12.Luo Qing,Zhao Zhengzhi,Zhao Aimin.Study on microstructure and properties of grade 600 MPa cold-rolled high strength steel[J].Hot Working Technology,2008,37(22):9-12.
[3]米振莉,潘殿军,江海涛.700 MPa冷轧低合金超高强钢的典型连续退火工艺[J].工程科学学报,2015,37(2):185-189.Mi Zhenli,Pan Dianjun,Jiang Haitao.Typical continuous annealing technology of cold-rolled 700 MPa ultra-high strength low-alloy steel[J].Chinese Journal of Engineering,2015,37(2):185-189.
[4]汤茜,李化龙.冷轧压下率和平整伸长率对低碳钢退火板组织性能的影响[J].金属热处理,2016,46(6):31-36.Tang Xi,Li Hualong.Effects of cold rolling reduction rate and flat extension rate on microstructure and properties of annealed low carbon steel sheet[J].Heat Treatment of Metals,2016,46(6):31-36.
[5]刘华赛,邝霜,谢春乾,等.退火温度和平整工艺对1000 MPa级双相钢组织和力学性能的影响[J].金属热处理,2017,42(8):98-101.Liu Huasai,Kuang Shuang,Xie Chunqian,et al.Influence of annealing temperature and temper rolling on microstructure and mechanical properties of 1000 MPa grade dual phase steel[J].Heat Treatment of Metals,2016,46(6):31-36.