铌钒系X70管线钢落锤撕裂试验断口分离的原因
Fracture Separation Reason in Drop Weight Tearing Test for Nb/V X70 Pipeline Steel
摘 要
为了分析铌钒系X70管线钢落锤撕裂试验(DWTT)断口分离的原因,通过光学显微镜观察分离裂纹尖端和断口附近未变形区组织形态,发现分离裂纹起源于带状组织薄弱界面；通过图像分析软件统计了不同断口分离严重程度试样的铁素体晶粒度和珠光体面积百分比,找出组织形态与分离严重程度的关系,认为中心偏析带状组织以及珠光体带状组织是导致断口分离的原因；通过控轧控冷(TMCP)工艺,特别是ACC水冷工艺的优化,使组织细化,带状组织消除,最终使DWTT断口的分离裂纹得以消除。
带状组织
落锤撕裂试验
断口分离
控轧控冷
Nb/V X70 pipeline steel
band structure
DWTT
fracture separation
TMCP
Abstract
The microstructure of crack tip and undeformed zone near the fracture was observed by optical microscope to analyze the fracture separation reason in drop weight tearing test (DWTT) for Nb/V X70 pipeline steel. It was found that the fracture separation was initiated from the side of band structure. Grain size and area percentage of pearlite were measured by picture analysis software. And the relationship of fracture separation and microstructure was found. The results showed that the central segregation band structure and pearlite band structure induced fracture separation. The band structure was disappear and grain size was thinning by TMCP technology optimizing, especially by accelerate cooling. Finally, the separation was eliminated.
中图分类号 TG115.5
所属栏目 试验与研究
基金项目
收稿日期 2009/7/21
修改稿日期
网络出版日期
作者单位点击查看
备注李家鼎(1982-),男,助理工程师，硕士。
引用该论文: LI Jia-ding,MA Qing-shen,JIANG Zhong-hang,LI Shao-po,ZHA Chun-he,DING Wen-hua. Fracture Separation Reason in Drop Weight Tearing Test for Nb/V X70 Pipeline Steel[J]. Physical Testing and Chemical Analysis part A:Physical Testing, 2010, 46(5): 284～287
李家鼎,麻庆申,姜中行,李少坡,查春和,丁文华. 铌钒系X70管线钢落锤撕裂试验断口分离的原因[J]. 理化检验－物理分册, 2010, 46(5): 284～287
被引情况:
【1】李涛,田鹏,孙宏,宫庆,刘振伟,汪海燕,宗秋丽, "X80M钢热轧板卷冲击性能不合格的原因分析",机械工程材料 38, 102-108(2014)
共有人对该论文发表了看法，其中：
人认为该论文很差
人认为该论文较差
人认为该论文一般
人认为该论文较好
人认为该论文很好
参考文献
【1】API Recommended Practice 5L3[S]. 1996．
【2】KIMA N J. Analysis of abnormal fracture occurring during drop-weighttear test of high-toughness line-pipe steel[J]. Materials Science and Engineering, 2004(A368):18-27．
【3】PISTONE V.Toughness necessary to prevent ductile fracture propagation[J]. EPRG 25 Anniversary Meeting Brussels, 1997,21(4):87-98．
【4】李国宝.管线钢落锤性能的影响因素分析[J].宽厚板,2005,12(6): 5-8．
【5】朱玉莲. 管线钢落锤撕裂试验试样断口分离剪切面积的评定[J]. 鞍钢技术,2007(3): 41-59．
【6】杨政. X70管线钢DWTT试样的分离裂纹及其断口评价[J]. 钢铁,2006,21(10):10-13．
【7】熊庆人. X70管线钢的断口分离现象分析研究[J]. 机械工程材料,2005,29(12):21-25．
【8】姚圣杰. 一种带状细晶铁素体的成因及其影响因素[J]. 轧钢,2007,24(5):7-9．
【9】范建文. 普通C-Mn钢超细晶中厚板的带状组织[J]. 钢铁,2004,39(8):101-104．
【2】KIMA N J. Analysis of abnormal fracture occurring during drop-weighttear test of high-toughness line-pipe steel[J]. Materials Science and Engineering, 2004(A368):18-27．
【3】PISTONE V.Toughness necessary to prevent ductile fracture propagation[J]. EPRG 25 Anniversary Meeting Brussels, 1997,21(4):87-98．
【4】李国宝.管线钢落锤性能的影响因素分析[J].宽厚板,2005,12(6): 5-8．
【5】朱玉莲. 管线钢落锤撕裂试验试样断口分离剪切面积的评定[J]. 鞍钢技术,2007(3): 41-59．
【6】杨政. X70管线钢DWTT试样的分离裂纹及其断口评价[J]. 钢铁,2006,21(10):10-13．
【7】熊庆人. X70管线钢的断口分离现象分析研究[J]. 机械工程材料,2005,29(12):21-25．
【8】姚圣杰. 一种带状细晶铁素体的成因及其影响因素[J]. 轧钢,2007,24(5):7-9．
【9】范建文. 普通C-Mn钢超细晶中厚板的带状组织[J]. 钢铁,2004,39(8):101-104．
相关信息
