硼对低焊接裂纹敏感性高强钢组织性能的影响

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Abstract The effect of boron on the microstructure and mechanical properties of high strength steels with low welding crack sensitivity, in the conditions of TMCP, TMCP+T and QT, respectively, were investigated. The result shows that boron improves the hardenability by suppressing the formation of proeutectoid ferrite. The microstructure of the boron-bearing steel, in the state of TMCP, consists of coarse bainite and martensite, and the prior austenite grain boundaries are retained. The QT process leads to a microstructure of tempered sorbite, but the boron-bearing steel exhibits lower fraction of high angle grain boundaries than the boron-free steel. A significant increase in strength, namely tensile strength by 300, 214 and 101MPa and yield strength by 320, 259 and 144MPa, respectively, for the above mentioned three conditions, but decrease in elongation and impact toughness, by the addition of boron, is observed. The best combination of strength and toughness is found to be achieved by QT process for the boron-free steel and TMCP+T process for the boron-bearing steel.

Key words： boron low susceptibility to weld cracking TMCP TMCP+T quenched and tempered

Received: 07 April 2013 Published: 13 December 2013

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	YANG Han
	YU Xi-Xia
	QU Jin-Bei

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YANG Han,YU Xi-Xia,QU Jin-Bei. Effect of Boron on the Microstructure and Properties of High Strength Steels With Low Susceptibility to Weld Cracking[J]. Iron and Steel, 2013, 48(12): 80-84.

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http://www.chinamet.cn/Jweb_gt/EN/ OR http://www.chinamet.cn/Jweb_gt/EN/Y2013/V48/I12/80

[1]	兰亮云，邱春林，赵德文，等. 微量硼对热轧低焊接裂纹敏感性钢力学性能的影响[J]. 钢铁研究学报, 2011,23(6): 13-17.
[2]	王克鲁，鲁世强，康永林，等. 硼对高强度低碳贝氏体钢组织和性能的影响[J]. 金属热处理, 2009, 34(3): 6-9.
[3]	Yamamoto K, Hasegama T, Takamura J. Effect of boron on intra-granular ferrite formation in ti-oxide bearing steel [J]. ISIJ International, 1996, 36(1): 80-86.
[4]	段贵生，陈伟庆，孙斌. 含硼低合金高强度钢焊接热影响区冲击韧度[J]. 北京科技大学学报, 2009, 31(8): 995-1000.
[3]	Yamamoto K, Hasegama T, Takamura J. Effect of boron on intra-granular ferrite formation in ti-oxide bearing steel [J]. ISIJ International, 1996, 36(1): 80-86.
[4]	段贵生，陈伟庆，孙斌. 含硼低合金高强度钢焊接热影响区冲击韧度[J]. 北京科技大学学报, 2009, 31(8): 995-1000.
[5]	Maitrepierre P, Thivellier D, Trieot R. Influence of boron on the decomposition of austenite in low carbon alloyed steels [J]. Metallurgical Transactions A, 1975, 6: 287-301.
[5]	Maitrepierre P, Thivellier D, Trieot R. Influence of boron on the decomposition of austenite in low carbon alloyed steels [J]. Metallurgical Transactions A, 1975, 6: 287-301.
[6]	Wang X M, He X L. Effect of boron addition on structure and properties of low carbon bainitic steels [J]. ISIJ international, 2002, 42(supplement): S38-S46.
[6]	Wang X M, He X L. Effect of boron addition on structure and properties of low carbon bainitic steels [J]. ISIJ international, 2002, 42(supplement): S38-S46.
[7]	Kim S, Kang Y, Lee C. Variation in microstructures and mechanical properties in the coarse-grained heat-affected zone of low-alloy steel with boron content [J]. Materials Science & Engineering A. 2013, 559: 178-186.
[7]	Kim S, Kang Y, Lee C. Variation in microstructures and mechanical properties in the coarse-grained heat-affected zone of low-alloy steel with boron content [J]. Materials Science & Engineering A. 2013, 559: 178-186.
[8]	Jun H J, Seo D H, Kang K B, et al. Effects of deformation and boron on microstructure and continuous cooling transformation in low carbon HSLA steels [J]. Materials science& engineering A, 2006, 422: 157-162.
[8]	Jun H J, Seo D H, Kang K B, et al. Effects of deformation and boron on microstructure and continuous cooling transformation in low carbon HSLA steels [J]. Materials science& engineering A, 2006, 422: 157-162.
[9]	张云燕，陈洪伟，陆在学，等. 热处理工艺对690MPa级高强度结构钢性能的影响[J]. 钢铁研究, 2007, 35(5): 29-31.
[9]	张云燕，陈洪伟，陆在学，等. 热处理工艺对690MPa级高强度结构钢性能的影响[J]. 钢铁研究, 2007, 35(5): 29-31.