金属学报  2012, Vol. 48 Issue (7): 797-806    DOI: 10.3724/SP.J.1037.2012.00215

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抗变形X100管线钢模拟焊接热影响区的组织与韧性研究

聂文金1, 2), 尚成嘉1), 由洋1), 张晓兵2), Sundaresa Subramanian3)

1) 北京科技大学材料科学与工程学院, 北京 100083 2) 江苏沙钢集团有限公司总工办, 张家港 215625 3) Department of Materials and Engineering, McMaster University, Hamilton, Canada, L8S4M1

MICROSTRUCTURE AND TOUGHNESS OF THE SIMULATED WELDING HEAT AFFECTED ZONE IN X100 PIPELINE STEEL WITH HIGH DEFORMATION RESISTANCE

NIE Wenjin, SHANG Chengjia, YOU Yang, ZHANG Xiaobing,  Sundaresa Subramanian

1) School of Material Science and Technology, University of Science and Technology Beijing, Beijing 100083 2) Chief Engineer Office, Jiangsu Shagang Group, Zhangjiagang 215625 3) Department of Materials and Engineering, McMaster University, Hamilton, Canada, L8S4M1

聂文金 尚成嘉 由洋 张晓兵 Sundaresa Subramanian. 抗变形X100管线钢模拟焊接热影响区的组织与韧性研究[J]. 金属学报, 2012, 48(7): 797-806.
, , , , . MICROSTRUCTURE AND TOUGHNESS OF THE SIMULATED WELDING HEAT AFFECTED ZONE IN X100 PIPELINE STEEL WITH HIGH DEFORMATION RESISTANCE[J]. Acta Metall Sin, 2012, 48(7): 797-806.

摘要 参考文献 相关文章 Metrics 全文: PDF(9618 KB)   摘要: 采用Gleeble-3800热模拟机研究了多相抗变形X100高Nb含量管线钢的焊接性能, 利用金相显微技术(OM)、扫描电镜(SEM)、电子背散射衍射(EBSD)对模拟焊接热影响区的组织进行了表征, 结合示波冲击及微观硬度实验结果分析了影响模拟焊接热影响粗晶区(CGHAZ)的低温韧性及热影响区硬度与组织之间的关系. 研究表明, 高Nb抗变形X100管线钢单道次焊接热输入小于20 kJ/cm时的CGHAZ具有较高韧性, 形成大角晶界密度较高的板条贝氏体或针状铁素体; 焊接热输入大于等于25 kJ/cm会导致CGHAZ晶粒均匀性的恶化, 使 M/A组元粗化, 并形成取向单一的粗大粒状贝氏体; 示波冲击实验及SEM断口分析显示, 粗大的M/A组元处极容易启裂, 高的大角晶界密度可显著提高裂纹扩展功, 使材料韧化. 同时, 为保证焊接热影响区不过度软化, 以及高硬度产生抗氢致延迟破坏, 单道次的焊接热输入以15-20 kJ/cm为宜. 关键词 ： X100管线钢,  热影响区,  热输入,  韧性,  抗变形,  显微组织     Abstract：A single welding thermal-cycles with different heat inputs (8, 16, 20, 25, 30 and 50 kJ/cm) were simulated by Gleeble 3800 to study the correlation of toughness, hardness and microstructure in heat affect zone (HAZ) of the X100 pipeline steel with multi-phases and 0.10\%Nb (mass fraction). The microstructures of the CGHAZ in HAZ were characterized by means of OM, SEM and EBSD, and mechanical properties were tested. The results show that for a low heat input of less than 20 kJ/cm, the microstructure is lath bainite or acicular ferrite structure with high-density of large-angle boundaries (≧15o), which exhibits good Charpy impact toughness. However, for a large heat input over 25 kJ/cm, the uniformity of prior austenite grains becomes worse, the M/A constituents and the granular bainite (GB) are coarsening, and the amount of large-angle boundaries decreases with the increase of heat input. The results of the instrumented Charpy impact test and the observation of fracture surfaces on the specimens indicate that the cracks are induced near the coarse M/A constituents and the large-angle boundaries can remarkably restrict crack propagations. Therefore, in order to ensure a strong match between the HAZ and the base metal, and the resistance to hydrogen induced delayed damage because of high hardness of HAZ, the heat input energy should be about between 15 and 20  kJ/cm. Key words： pipeline steel    heat affect zone(HAZ)    heat input    toughness    deformation resistance    microstructure 收稿日期: 2012-04-20      基金资助: 国家重点基础研究发展计划资助项目2010CB630801 作者简介: 聂文金, 男, 1978年生, 博士生 服务 把本文推荐给朋友 加入引用管理器 E-mail Alert RSS 作者相关文章 聂文金 尚成嘉 由洋 张晓兵 Mani Subramanian 44.8K 链接本文: https://www.ams.org.cn/CN/10.3724/SP.J.1037.2012.00215      或      https://www.ams.org.cn/CN/Y2012/V48/I7/797 [1] Wang X X. Weldding Pipe, 2012; 35( ): 5 (王晓香. 焊管, 2012; 35(~): 5) [2] Shang C J, WangX X, Liu Q Y, Fu J Y. Int Seminar on Welding of Pipline Steel, Arasa, Brazil: December, 2011 [3] Miao C L, Shang C J, Cao J P, Wang X M, He X L. Iron Steel, 2009; 44: 62 (缪成亮, 尚成嘉, 曹建平, 王学敏, 贺信莱. 钢铁, 2009, 44: 62) [4] Miao C L, Shang C J, Zhang G D, Sunbrainmani S. Mater Sci Eng, 2010; A527: 4985 [5] Miao C L, Shang C J, Wang X M, Zhang L F, Subramanian S V. 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