X70抗大变形管线钢焊接接头的组织与力学性能
Microstructure and Mechanical Properties of X70 Pipeline Steel with High Deformability
摘 要
采用三种不同的焊接工艺对X70抗大变形管线钢进行焊接试验, 通过组织观察、拉伸及冲击试验分析了焊接接头的显微组织和力学性能。结果表明: 采用GMAW焊接的试样, 其焊缝金属主要由针状铁素体和少量准多边形铁素体组成, 热影响区组织为粗大的粒状贝氏体和少量准多边形铁素体, 具有较高的强度和韧性, 但塑性变形能力较差; 采用GMAW+FCAW焊接的试样, 其焊缝主要由针状铁素体和少量准多边形铁素体组成, 热影响区为粗大的粒状贝氏体和板条贝氏体, 具有很高的屈强比; 采用SMAW+FCAW焊接的试样, 其焊缝主要为粗大的多边形铁素体, 热影响区为准多边形状铁素体和贝氏体, 焊缝硬度低于热影响区和母材的, 其焊接接头具有优良的强度和韧塑性, 同时具有较高的抗变形能力。
焊接工艺
组织
力学性能
X70 pipeline steel with high deformability
welding process
microstructure
mechanical property
Abstract
Three kinds of welding processes were adopted in the welding test for X70 pipeline steels with high deformability, and the microstructure and mechanical properties of the welded joints were analyzed by microstructure observation, tensile test and impact test. The results show that the weld metal of the welded joints by GMAW was composed of acicular ferrites and little quasi-polygonal ferrites, while the HAZ consisted of coarse granular bainites and quasi-polygonal ferrites. And the welded joints had good strength and toughness but low ductility. The weld metal of welded joints by GMAW+FCAW was mainly comprised of acicular ferrites and little quasi-polygonal ferrites, the HAZ was composed of coarse granular bainites and lath bainites, and the welded joint had a very high yield ratio. Coarse polygonal ferrites and little bainites composed the weld metal of the welded joints by SMAW+FCAW, and quasi-polygonal ferrites and bainites composed the HAZ, which led to the hardness of weld metal lower than those of the HAZ and the base metal. Furthermore, the welded joint by SMAW+FCAW had good strength, toughness and ductility and high resistance to deformation ability.
中图分类号 TG457
所属栏目 试验研究
基金项目 四川省教育厅成果转化重大培育项目(13CZ0026)
收稿日期 2013/8/2
修改稿日期 2014/6/1
网络出版日期
作者单位点击查看
备注周翠(1988-), 女, 四川南充人, 硕士研究生。
引用该论文: ZHOU Cui,WANG Bin,ZHU Jia-xiang,SHEN Kun. Microstructure and Mechanical Properties of X70 Pipeline Steel with High Deformability[J]. Materials for mechancial engineering, 2014, 38(10): 32～36
周翠,王斌,朱加祥,申坤. X70抗大变形管线钢焊接接头的组织与力学性能[J]. 机械工程材料, 2014, 38(10): 32～36
被引情况:
【1】李 光,李雪萍,徐学利,张骁勇,高惠临,刘彦明, "X100抗大变形管线钢焊接热影响区的显微组织与冲击功",机械工程材料 39, 80-83(2015)
【2】由宗彬,李烨铮,刘 宇, "焊接峰值温度对X80管线钢焊接接头热影响区性能影响的热模拟",机械工程材料 40, 54-57(2016)
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参考文献
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【3】孙宏.基于应变设计的大应变X100管线钢的成分设计与开发[J].焊管, 2010, 33(8): 66-71.
【4】OKATSU M, SHINMIYA T, ISHIKAWA N, et al. Development of high strength linepipe with excellent deformability[C]// Proceedings of OMAE 2005. [S.l.]: [s.n.], 2005: 1-8.
【5】ISHIKAWA N, OKATSU M, ENDO S, et al. Mechanical and metallurgical properties of high strength linepipe for high strain application [C]// International Pipeline Steel Forum. Beijing: CNPC, 2008: 56-60.
【6】赵文贵, 杨汉, 王炜, 等.不同热输入条件下X100管线钢焊接热影响区的组织及冲击韧性[J].机械工程材料, 2012, 36(9): 90-92.
【7】王伟, 严伟, 胡平.抗大变形管线钢的研究进展[J].钢铁研究学报, 2011, 23(2): 2-5.
【8】YANG You, CHEN Jia-shang, NIE Wen-jin, et al. Investigation on the microstructure and toughness of coarse grained heat affected zone in X-100 multi-phase pipeline steel with high Nb content[J].Materials Science & Engineering: A, 2012, 558: 692-701.
【9】胡美娟, 王鹏, 韩新利, 等.X80级抗大变形管线钢焊接粗晶区的组织和性能[J].焊接学报, 2012, 33(9): 94-96.
【10】张丹, 刘雅政, 周乐育, 等.分段冷却工艺对微合金铁素体-贝氏体双相钢组织和性能的影响[J].机械工程材料, 2012, 36(11): 51-53.
【11】ISHIKAWA N, SHIKANAL N, KONDO J.Development of ultra-high strength linepipes with dual phase microstructure for high strain application[J]．JFE Technical Report, 2008, 12: 15-19.
【12】HUPER T．Effect of constituent phases on the stress-strain relationship of dual phase steels [J].ISIJ International, 1999, 39(3): 288-294 .
【13】SMITH Y E, GOLDEN A P, CRYDEMAN R L. Tow and improved ductility and toughness [M].Tokyo: Tokyo Clinax Molybdemnum Company (Japan) Ltd, 1988.
【14】李鹤林, 吉玲康, 田伟.西气东输一、二线管道工程的几项重大技术进步[J] .天然气工业, 2010, 30(4): 1-9.
【15】吉玲康, 李鹤林, 赵文轸, 等.X70抗大变形管线钢管的组织结构和形变硬化性能分析[J].西安交通大学学报, 2012, 46(9): 111-115.
【16】朱亮, 陈剑虹.热影响区软化焊接接头的强度及变形[J].焊接学报, 2004, 25(2): 61-65.
【17】GORDON J R, HAMMOND J, SWANK G. Welding challenges for strain-based design[C]//International Conference on Advances in Welding Technology Pipeline Welding and Technology. Galveston: TX, 1999: 271-282.
【18】WILLIAM M, GORDON R, SMITH R. Strain-based design guidelines for pipeline girth welds[C]//The Proceedings of the fourteenth (2004) International Offshore and Polar Engineering Conference.California: ISOPE, 2004: 10-17.
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