两相区退火温度对含铜贝氏体/铁素体复相钢组织和性能的影响
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摘要
借助SEM、XRD、TEM、EPMA、室温拉伸等试验手段,采用IQ&PB(两相区退火-贝氏体区淬火碳配分)热处理工艺,针对两相区退火温度对含铜贝氏体/铁素体复相钢组织和性能的影响进行研究。结果表明,两相区退火温度升高,铁素体所占体积分数减少,板条状贝氏体含量增加;试验用钢的抗拉强度逐渐升高,而伸长率则不断下降。室温组织中残留奥氏体含量,随退火温度升高呈先增加后减少的趋势变化。790℃退火处理,拉伸形变过程,应变后期加工硬化指数n值较高,持续加工硬化能力明显,断口处裂纹尖端钝化,强塑积可达28.06 GPa·%。
Influence of intercritical annealing temperature on the microstructure and mechanical properties of a Cu bearing bainite/ferrite multiphase steel under the treatment of IQ&PB process were studied by SEM,XRD,TEM,EPMA and room-temperature tensile test. The results show that when the intercritical annealing temperature increases,the volume fraction of ferrite reduces and the content of the lathy bainite increases,and the tensile strength of the experimental steel gradually increases,while the elongation decreases. With the increase of annealing temperature,the content of retained austenite increases first then reduces. When annealing treatment temperature is 790 ℃,the work hardening exponent is higher in the post-strain process,and the continuous working hardening capacity is obvious. The crack tip of the tensile fracture is passivated,and the product of strength and elongation can reach 28. 06 GPa·%.
Influence of intercritical annealing temperature on the microstructure and mechanical properties of a Cu bearing bainite/ferrite multiphase steel under the treatment of IQ&PB process were studied by SEM,XRD,TEM,EPMA and room-temperature tensile test. The results show that when the intercritical annealing temperature increases,the volume fraction of ferrite reduces and the content of the lathy bainite increases,and the tensile strength of the experimental steel gradually increases,while the elongation decreases. With the increase of annealing temperature,the content of retained austenite increases first then reduces. When annealing treatment temperature is 790 ℃,the work hardening exponent is higher in the post-strain process,and the continuous working hardening capacity is obvious. The crack tip of the tensile fracture is passivated,and the product of strength and elongation can reach 28. 06 GPa·%.
引文
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[3]De Knijf D,Santofimia M J,Shi H,et al.In situ austenite-martensite interface mobility study during annealing[J].Acta Materialia,2015,90:161-168.
[4]韩志勇,张明达,徐海峰,等.高性能汽车钢组织性能特点及未来研发方向[J].钢铁,2016,51(2):1-9.Han Zhiyong,Zhang Mingda,Xu Haifeng,et al.Research and application of high performance automobile steel[J].Iron and Steel,2016,51(2):1-9.
[5]景财年,王作成,金成俊,等.铜元素和退火温度对TRIP冷轧钢板组织和力学性能的影响[J].金属热处理,2004,29(9):19-22.Jing Cainian,Wang Zuocheng,Jin Chengjun,et al.Effects of copper and annealing temperature on the microstructure and mechanical properties of TRIP cold-rolled steel sheets[J].Heat Treatment of Metals,2004,29(9):19-22.
[6]陈连生,曹鸿梓,田亚强,等.前驱体对含Cu低碳钢I&Q&P处理后组织性能的影响[J].材料导报B:研究篇,2017,31(3):105-109.Chen Liansheng,Cao Hongzi,Tian Yaqiang,et al.Influence of precursor on microstructure and mechanical property of a Cu bearing low-carbon steel by I&Q&P treatment[J].Mater Rev B,2017,31(3):105-109.
[7]陈蓬,许云波,沈春豫,等.临界区退火对含磷低硅TRIP钢组织性能的影响[J].东北大学学报(自然科学版),2013,34(11):1562-1565.Chen Peng,Xu Yunbo,Shen Chunyu,et al.Effects of intercritical annealing on microstructure and mechanical properties of low silicon TRIP steel with phosphorus addition[J].Journal of Northeastern University(Natural Science),2013,34(11):1562-1565.
[8]付波,杨王玥,李龙飞.临界区退火对冷轧TRIP钢组织及力学性能的影响[J].金属热处理,2015,40(1):23-26.Fu Bo,Yang Yuyue,Li Longfei.Effect of intercritical annealing temperature on microstructure and mechanical properties of cold-rolled TRIP steels[J].Heat Treatment of Metals,2015,40(1):23-26.
[9]田亚强,李然,宋进英,等.Mn配分时间对低碳硅锰钢I&Q&P处理后组织与性能影响[J].热加工工艺,2016,45(16):161-164.Tian Yaqiang,Li Ran,Song Jinying,et al.Effect of Mn partitioning time on microstructure and properties of low-carbon steel with I&Q&P treatment[J].Hot Working Technology,2016,45(16):161-164.
[10]Li Y J,Li X L,Guo Y,et al.Microstructure and partitioning behavior characteristics in low carbon steels treated by hot-rolling direct quenching and dynamical partitioning processes[J].Mater Charact,2016,121:157-165.
[11]谢振家,尚成嘉,周文浩,等.低合金多相钢中残留奥氏体对塑性和韧性的影响[J].金属学报,2016,52(2):224-232.Xie Zhenjia,Shang Chengjia,Zhou Wenhao,et al.Effect of retained austenite on ductility and toughness of a low alloyed multiphase steel[J].Acta Metallurgica Sinica,2016,52(2):224-232.