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| X120管线钢焊接热影响区组织与韧性 | |
| 引用本文： | 李建一,谷雨,韩秀林,潘强,王海生,乔桂英. X120管线钢焊接热影响区组织与韧性[J]. 焊管, 2012, 35(3): 11-14,28 |
| 作者姓名： | 李建一 谷雨 韩秀林 潘强 王海生 乔桂英 |
| 作者单位： | 1. 中国石油集团渤海石油装备制造有限公司,河北青县,062658 2. 燕山大学材料科学与工程学院,河北秦皇岛,066004 3. 燕山大学环境与化学工程学院,河北秦皇岛,066004 |
| 基金项目： | 河北省自然科学基金(E2011203169;E2009000443);河北省科技计划项目(09276705D) |
| 摘 要： | 采用热模拟试验技术,研究了X120管线钢焊接热影响区的组织与性能变化规律,结果表明：在X120钢的焊接热影响区中存在两个脆化区,即焊接粗晶区和两相临界区。粗晶区随焊接热输入的增加,脆化有减弱的趋势。该钢采用低C、高Nb、微Ti复合成分设计,有利于抑制焊接粗晶区原奥氏体晶粒长大,但高的合金含量及B的添加增加了钢的淬透性,导致了粗晶区韧性的降低。沿原奥氏体晶粒形成的岛状组织是导致两相区韧性降低的主要原因。 |
| 关 键 词： | X120管线管 焊接热影响区 模拟 组织 性能 |
Microstructure and Toughness of Weld Heat Affected Zone for X120 Pipeline Steel |
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| LI Jian-yi , GU Yu , HAN Xiu-lin , PAN Qiang , WANG Hai-sheng , QIAO Gui-ying. Microstructure and Toughness of Weld Heat Affected Zone for X120 Pipeline Steel[J]. Welded Pipe and Tube, 2012, 35(3): 11-14,28 | |
| Authors: | LI Jian-yi GU Yu HAN Xiu-lin PAN Qiang WANG Hai-sheng QIAO Gui-ying |
| Affiliation: | 1.CNPC Bohai Equipment Manufacturing Co.,Ltd.,Qingxian 062658,Hebei,China; 2.College of Materials Science and Engineering,Yanshan University,Qinhuangdao 066004,Hebei,China; 3.School of Environment and Chemical Engineering,Yanshan University,Qinhuangdao 066004,Hebei,China) |
| Abstract: | The variation of microstructure and mechanical properties of weld heat affected zone(HAZ) of X120 pipeline steel were studied by means of thermal simulation technology.The results showed that two embrittlement regions exist in HAZ,namely,the coarse grain heat affected zone(CGHAZ) and critical two-phase region.Along with welding heat input increase,the embrittlement of coarse grain zone weaken,this steel is designed with composite composition of low C,high Nb and micro Ti,it is propitious to inhibit prior austenite grain of the coarse grain zone.Due to great amount of alloyed elements and B added in steel,the hardenability of steel increase,and the toughness of coarse grain zone decrease.The island structure distributed along prior austenite grain boundary is the main reason for decreasing of toughness in critical two-phase region. |
| Keywords: | X120 line pipe weld HAZ simulation microstructure property |
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