低碳高锰HFW钢管焊缝冲击韧性的优化研究  

Study on Optimization of Weld Seam Impact Toughness of Low C/High Mn HFW Pipe

作　　者：田鹏[1] 王晓颖[1] 尚成嘉[2] 李秀程[2] 杨明秦 路广平[1] 朱斌燕 

机构地区：[1]华油钢管有限公司扬州分公司,江苏扬州225128 [2]北京科技大学,北京100083

出　　处：《钢管》2017年第6期57-62,共6页Steel Pipe

基　　金：国家科技支撑计划"高性能膨胀套管产业化技术开发"(2015BAE03B02)

摘　　要：采用化学分析、力学性能测试、光学金相观察、扫描电镜观察等手段,对低碳高锰HFW钢管进行检测和评价,并对韧性较差的焊缝冲击试样进行分析。结果发现,由于靠近焊缝且平行于焊缝的金属流线中Mn的偏析,造成金属流线上形成沿着焊缝方向分布的马氏体,从而降低了焊缝的冲击韧性。通过后续对低碳高锰HFW钢管进行退火热处理,消除了焊缝组织中的马氏体脆性相,有效改善了焊缝冲击韧性。The low carbon-high manganese HFW pipe is tested and evaluated by means of chemical analysis, mechanical property test, optical microscopy metallographic observation and scanning electron microscope character- ization, etc. And the weld seam impact specimens with poor toughness are analyzed. As a result, it is revealed that the main eause for the low impact toughness of the weld seam is tile formation of martensite as caused by the segregation of Mn in the welding metal streamline close and parallel to the weld seam, and distributed on the welding metal streamline and along the weht seam direetion. Thanks to the follow-up annealing treatment of the pipe, the martensitie brittle phase in the weht seam structure is eliminated, and in turn impact toughness of the weld seam is obviously improved.

关 键 词：HFW钢管 低碳高锰 马氏体 退火热处理 冲击韧性 

分 类 号：TG162.84[金属学及工艺—热处理] TG406[金属学及工艺—金属学]