焊后热处理对P92钢焊接接头显微组织和力学性能的影响
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摘要
采用光学金相显微镜和力学性能测试等方法,研究了电阻履带式和中频感应两种不同的焊后热处理方法对P92钢焊接接头显微组织和力学性能的影响。结果表明:中频感应处理下的焊缝组织较为细小,马氏体板条界面变得更加模糊;焊接接头各层母材、热影响区及焊缝硬度值分布均匀,内、中和外层的硬度差值较小;焊缝及热影响区冲击吸收能量沿壁厚方向分布较为均匀,且均高于P92母材标准要求值。因而,中频感应加热法不仅可以很好地改善焊缝组织,而且在壁厚方向上,可以使焊缝韧性等力学性能更加均匀。
Effects of resistance crawler-type heating and medium frequency induction heating on microstructure and mechanical properties of P92 steel welded joints were studied by means of optical metallographic microscope and mechanical properties test. The results show that the microstructure of the welded joint is fine and the interface of martensite lath becomes more fuzzy under medium frequency induction heat treatment. The microhardness values of the base metal,heat affected zone and weld seam of each layer of the welded joint are evenly distributed,and the difference among the microhardness of the inner layer,the middle layer and the outer layer is small. The impact absorption energy values of weld seam and heat affected zone are distributed evenly along the wall thickness direction,and are higher than the standard values of P92 base metal. Therefore,medium frequency induction heat treatment method not only improves the weld microstructure,but also makes the weld impact toughness value and other mechanical properties more uniform in the direction of wall thickness.
Effects of resistance crawler-type heating and medium frequency induction heating on microstructure and mechanical properties of P92 steel welded joints were studied by means of optical metallographic microscope and mechanical properties test. The results show that the microstructure of the welded joint is fine and the interface of martensite lath becomes more fuzzy under medium frequency induction heat treatment. The microhardness values of the base metal,heat affected zone and weld seam of each layer of the welded joint are evenly distributed,and the difference among the microhardness of the inner layer,the middle layer and the outer layer is small. The impact absorption energy values of weld seam and heat affected zone are distributed evenly along the wall thickness direction,and are higher than the standard values of P92 base metal. Therefore,medium frequency induction heat treatment method not only improves the weld microstructure,but also makes the weld impact toughness value and other mechanical properties more uniform in the direction of wall thickness.
引文
[1]杨富,李为民,任永宁.超临界、超超临界锅炉用钢[J].电力设备,2004,5(10):41-46.Yang Fu,Li Weimin,Ren Yongning.Alloy steel used for supercritical and ultra supercritical pressure boiler[J].Electrical Equipment,2004,5(10):41-46.
[2]杨富,章应霖,任永宁,等.新型耐热钢焊接[M].北京:中国电力出版社,2006:123-128.
[3]李新梅,张忠文,杜宝帅,等.P92钢的微观组织和硬度[J].金属热处理,2012,37(5):38-41.Li Xinmei,Zhang Zhongwen,Du Baoshuai,et al.Microstructure and hardness of P92 steel[J].Heat Treatment of Metals,2012,37(5):38-41.
[4]李宜男,杨松,丁冶.超超临界锅炉用SA-355 P92钢的焊接工艺性能研究[J].焊接,2007(6):44-46.Li Yinan,Yang Song,Ding Ye.Welding technology of SA-335 P92steel used in USC boiler[J].Welding and Joining,2007(6):44-46.
[5]李文彬,姜运建,冯砚厅,等.焊后热处理对P92钢焊缝冲击性能的影响[J].金属热处理,2011,36(7):71-73.Li Wenbin,Jiang Yunjian,Feng Yanting,et al.Influence of postwelding heat treatment on impact property of P92 steel welding seam[J].Heat Treatment of Metals,2011,36(7):71-73.
[6]刘福广,李太江,王彩侠,等.焊后热处理温度对P92钢焊缝显微组织和力学性能的影响[J].动力工程学报,2011,31(10):803-807.Liu Fuguang,Li Taijiang,Wang Caixia,et al.Effect of postweld heat treatment temperature on microstructure and mechanical properties of P92 weld metal[J].Journal of Chinese Society of Power Engineering,2011,31(10):803-807.
[7]赵勇桃,张韶慧,董俊慧,等.焊后热处理对P92钢焊接接头组织及力学性能的影响[J].金属热处理,2015,40(7):33-36.Zhao Yongtao,Zhang Shaohui,Dong Junhui,et al.Effect of post welding heat treatment on microstructure and mechanical properties of P92 steel welded joint[J].Heat Treatment of Metals,2015,40(7):33-36.
[8]屈国民,牛靖,胡彬,等.回火温度对P92钢焊接接头组织和性能的影响[J].热加工工艺,2014,43(9):44-47.Qu Guomin,Niu Jing,Hu Bin,et al.Effect of tempering temperature on microstructure and mechanical properties of P92 welded joints[J].Hot Working Technology,2014,43(9):44-47.
[2]杨富,章应霖,任永宁,等.新型耐热钢焊接[M].北京:中国电力出版社,2006:123-128.
[3]李新梅,张忠文,杜宝帅,等.P92钢的微观组织和硬度[J].金属热处理,2012,37(5):38-41.Li Xinmei,Zhang Zhongwen,Du Baoshuai,et al.Microstructure and hardness of P92 steel[J].Heat Treatment of Metals,2012,37(5):38-41.
[4]李宜男,杨松,丁冶.超超临界锅炉用SA-355 P92钢的焊接工艺性能研究[J].焊接,2007(6):44-46.Li Yinan,Yang Song,Ding Ye.Welding technology of SA-335 P92steel used in USC boiler[J].Welding and Joining,2007(6):44-46.
[5]李文彬,姜运建,冯砚厅,等.焊后热处理对P92钢焊缝冲击性能的影响[J].金属热处理,2011,36(7):71-73.Li Wenbin,Jiang Yunjian,Feng Yanting,et al.Influence of postwelding heat treatment on impact property of P92 steel welding seam[J].Heat Treatment of Metals,2011,36(7):71-73.
[6]刘福广,李太江,王彩侠,等.焊后热处理温度对P92钢焊缝显微组织和力学性能的影响[J].动力工程学报,2011,31(10):803-807.Liu Fuguang,Li Taijiang,Wang Caixia,et al.Effect of postweld heat treatment temperature on microstructure and mechanical properties of P92 weld metal[J].Journal of Chinese Society of Power Engineering,2011,31(10):803-807.
[7]赵勇桃,张韶慧,董俊慧,等.焊后热处理对P92钢焊接接头组织及力学性能的影响[J].金属热处理,2015,40(7):33-36.Zhao Yongtao,Zhang Shaohui,Dong Junhui,et al.Effect of post welding heat treatment on microstructure and mechanical properties of P92 steel welded joint[J].Heat Treatment of Metals,2015,40(7):33-36.
[8]屈国民,牛靖,胡彬,等.回火温度对P92钢焊接接头组织和性能的影响[J].热加工工艺,2014,43(9):44-47.Qu Guomin,Niu Jing,Hu Bin,et al.Effect of tempering temperature on microstructure and mechanical properties of P92 welded joints[J].Hot Working Technology,2014,43(9):44-47.