高强贝氏体非调质钢的奥氏体连续冷却相变
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摘要
采用DIL805L热膨胀仪,研究了Si-Mn-Mo系贝氏体非调质钢奥氏体连续冷却转变过程(CCT曲线),分析其显微组织及硬度、强度的变化。结果表明,试验钢在小于7℃/s较宽冷速范围内均可获得贝氏体+铁素体组织,且贝氏体以粒状贝氏体+板条贝氏体2种形态存在。随着冷却速度增加,显微组织逐渐转变为以马氏体为主,同时晶粒细化作用增强,硬度及抗拉强度增加。可以通过对转变组织的控制,得到综合力学性能良好的贝氏体钢。
Continuous cooling transformation curves( CCT) of a Si-Mn-Mo bainitic non-quenched and tempered steel were studied on a DIL805 L thermal dilatometer. The evolution of microstructure,hardness and intensity was analyzed. The result shows that bainite and ferrite can be both obtained when the cooling rate is under 7 ℃/s,and the bainite is composed of granular bainite + lath bainite. As the cooling rate increasing,the microstructure is changed to martensite mainly,and the grain refinement effect is enhanced,which makes the hardness and tensile strength increase. Thus,bainite steel with good comprehensive mechanical properties can be obtained by controlling the microstructure transformation.
Continuous cooling transformation curves( CCT) of a Si-Mn-Mo bainitic non-quenched and tempered steel were studied on a DIL805 L thermal dilatometer. The evolution of microstructure,hardness and intensity was analyzed. The result shows that bainite and ferrite can be both obtained when the cooling rate is under 7 ℃/s,and the bainite is composed of granular bainite + lath bainite. As the cooling rate increasing,the microstructure is changed to martensite mainly,and the grain refinement effect is enhanced,which makes the hardness and tensile strength increase. Thus,bainite steel with good comprehensive mechanical properties can be obtained by controlling the microstructure transformation.
引文
[1]董成瑞,任海鹏,金同哲,等.微合金非调质钢[M].北京:冶金工业出版社,2000.
[2]常开地,王萍,刘卫萍.非调质钢的发展现状和应用进展[J].金属热处理,2011,36(3):80-85.Chang Kaidi, Wang Ping, Liu Weiping. Development status and application prospect of non-quenched tempered steel[J]. Heat Treatment of Metals,2011,36(3):80-85.
[3]丁洁.汽车用微合金非调质钢的应用现状及发展[J].金属热处理,2006,31(9):46-48.Ding jie. Present situation of application and development of microalloyed steel for automobile[J]. Heat Treatment of Metals,2006,31(9):46-48.
[4]周鹿宾.非调质钢和贝氏体钢的开发研究及应用[J].金属热处理,1993(11):3-9.Zhou Lubin. Research and application of non-tempered steel and bainite steel[J]. Heat Treatment of Metals,1993(11):3-9.
[5]安佰锋,高古辉,白秉哲,等. Mn系贝氏体钢的研究与新进展[C]//第十一次全国热处理大会论文集.太原:中国机械学会热处理分会,2015,7:1051-1062.
[6]张拓燕,杨军,邓瑞刚.贝氏体非调质钢的研究现状与应用[J].热加工工艺,2011,40(8):43-46.Zhang Tuoyan,Yang Jun,Deng Ruigang. Research and application of bainite non-tempered steel[J]. Hot Working Technology,2011,40(8):43-46.
[7]王贵,郭长庆,张明星. Si-Mn-Mo系贝氏体钢组织和性能的研究[J].金属热处理,1995,20(8):9-12.Wang Gui, Guo Changqing, Zhang Mingxing. Microstructure and properties of Si-Mn-Mo bainite steel[J]. Heat Treatment of Metals,1995,20(8):9-12.
[8]汪学瑶.新型非调质钢的发展[J].特殊钢,2001,22(2):1-6.Wang Xueyao. Development of new type non-quenched-tempered steels[J]. Special Steel,2001,22(2):1-6.
[9]彭金明,罗毅,汪宏斌,等.一种高强韧性高淬透性贝氏体型非调质钢[J].机械工程材料,2010,34(8):9-12.Peng Jinming,Luo Yi,Wang Hongbin,et al. A non-quenched and tempered bainitic steel with high strength-toughness and hardenability[J]. Materials for Mechanical Engineering,2010,34(8):9-12.
[10]林慧国,傅代直.钢的奥氏体转变曲线-原理、测试与应用[M].北京:机械工业出版社,1988.
[11]黄维刚,方鸿生,郑燕康.硅和少量钼对Mn-B系贝氏体钢转变动力学的影响[J].金属热处理,1997,22(10):25-28.Huang Weigang,Wang Hongsheng,Zheng Yankang. Effect of Si and Mo on the continuous cooling transformation kinetics in Mn-B bainitic steel[J]. Heat Treatment of Metals,1997,22(10):25-28.
[12]刘晓,张明星,陈大明,等. Si-Mn-Mo系贝氏体钢的CCT图[J].金属学报,1993,29(3):97-101.Lin Xiao,Zhang Mingxing,Chen Daming,et al. CCT-diagram of SiMn-Mo alloy system bainitic steels[J]. Acta Metallurgica Sinica,1993,29(3):97-101.
[13]于庆波,孙莹,倪宏昕,等.不同类型的贝氏体组织对低碳钢力学性能的影响[J].机械工程学报,2009,45(12):284-287.Yu Qingbo,Sun Ying,Ni Hongxin,et al. Effect of different bainitic microstructures on the mechanical properties of low-carbon steel[J].Journal of Mechanical Engineering,2009,45(12):284-287.
[14]尚成嘉,杨善武,王学敏,等.新颖的贝氏体/铁素体双相低碳微合金钢[J].北京科技大学学报,2003,25(3):288-290.Shang Chengjia,Yang Shanwu,Wang Xuemin,et al. A bainite/ferrite dual-phase low-carbon microalloying steel with high strength and ductility[J]. Journal of University of Science and Technology Beijing,2003,25(3):288-290.
[2]常开地,王萍,刘卫萍.非调质钢的发展现状和应用进展[J].金属热处理,2011,36(3):80-85.Chang Kaidi, Wang Ping, Liu Weiping. Development status and application prospect of non-quenched tempered steel[J]. Heat Treatment of Metals,2011,36(3):80-85.
[3]丁洁.汽车用微合金非调质钢的应用现状及发展[J].金属热处理,2006,31(9):46-48.Ding jie. Present situation of application and development of microalloyed steel for automobile[J]. Heat Treatment of Metals,2006,31(9):46-48.
[4]周鹿宾.非调质钢和贝氏体钢的开发研究及应用[J].金属热处理,1993(11):3-9.Zhou Lubin. Research and application of non-tempered steel and bainite steel[J]. Heat Treatment of Metals,1993(11):3-9.
[5]安佰锋,高古辉,白秉哲,等. Mn系贝氏体钢的研究与新进展[C]//第十一次全国热处理大会论文集.太原:中国机械学会热处理分会,2015,7:1051-1062.
[6]张拓燕,杨军,邓瑞刚.贝氏体非调质钢的研究现状与应用[J].热加工工艺,2011,40(8):43-46.Zhang Tuoyan,Yang Jun,Deng Ruigang. Research and application of bainite non-tempered steel[J]. Hot Working Technology,2011,40(8):43-46.
[7]王贵,郭长庆,张明星. Si-Mn-Mo系贝氏体钢组织和性能的研究[J].金属热处理,1995,20(8):9-12.Wang Gui, Guo Changqing, Zhang Mingxing. Microstructure and properties of Si-Mn-Mo bainite steel[J]. Heat Treatment of Metals,1995,20(8):9-12.
[8]汪学瑶.新型非调质钢的发展[J].特殊钢,2001,22(2):1-6.Wang Xueyao. Development of new type non-quenched-tempered steels[J]. Special Steel,2001,22(2):1-6.
[9]彭金明,罗毅,汪宏斌,等.一种高强韧性高淬透性贝氏体型非调质钢[J].机械工程材料,2010,34(8):9-12.Peng Jinming,Luo Yi,Wang Hongbin,et al. A non-quenched and tempered bainitic steel with high strength-toughness and hardenability[J]. Materials for Mechanical Engineering,2010,34(8):9-12.
[10]林慧国,傅代直.钢的奥氏体转变曲线-原理、测试与应用[M].北京:机械工业出版社,1988.
[11]黄维刚,方鸿生,郑燕康.硅和少量钼对Mn-B系贝氏体钢转变动力学的影响[J].金属热处理,1997,22(10):25-28.Huang Weigang,Wang Hongsheng,Zheng Yankang. Effect of Si and Mo on the continuous cooling transformation kinetics in Mn-B bainitic steel[J]. Heat Treatment of Metals,1997,22(10):25-28.
[12]刘晓,张明星,陈大明,等. Si-Mn-Mo系贝氏体钢的CCT图[J].金属学报,1993,29(3):97-101.Lin Xiao,Zhang Mingxing,Chen Daming,et al. CCT-diagram of SiMn-Mo alloy system bainitic steels[J]. Acta Metallurgica Sinica,1993,29(3):97-101.
[13]于庆波,孙莹,倪宏昕,等.不同类型的贝氏体组织对低碳钢力学性能的影响[J].机械工程学报,2009,45(12):284-287.Yu Qingbo,Sun Ying,Ni Hongxin,et al. Effect of different bainitic microstructures on the mechanical properties of low-carbon steel[J].Journal of Mechanical Engineering,2009,45(12):284-287.
[14]尚成嘉,杨善武,王学敏,等.新颖的贝氏体/铁素体双相低碳微合金钢[J].北京科技大学学报,2003,25(3):288-290.Shang Chengjia,Yang Shanwu,Wang Xuemin,et al. A bainite/ferrite dual-phase low-carbon microalloying steel with high strength and ductility[J]. Journal of University of Science and Technology Beijing,2003,25(3):288-290.