[1]王学林,等.高强度管线钢焊接热影响区显微组织精细表征[J].焊管,2019,42(7):26-38.[doi:10.19291/j.cnki.1001-3938.2019.7.003]
　WANG Xuelin,LI Xueda,et al.Fine Characterization of High Strength Pipeline Steel Welding HAZ Microstructure[J].,2019,42(7):26-38.[doi:10.19291/j.cnki.1001-3938.2019.7.003]
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高强度管线钢焊接热影响区显微组织精细表征()
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《焊管》[ISSN:1001-3938/CN:61-1160/TE]

卷:
42
期数:
2019年第7期
页码:
26-38
栏目:
会议专辑
出版日期:
2019-07-28

文章信息/Info

Title:
Fine Characterization of High Strength Pipeline Steel
Welding HAZ Microstructure
文章编号:
10.19291/j.cnki.1001-3938.2019.7.003
作者:
王学林1;  2; 李学达3; 尚成嘉1
1. 北京科技大学钢铁共性技术协同创新中心， 北京 100083；
2. 重庆铜梁高新技术产业开发区管委会， 重庆 402560；
3. 中国石油大学（华东） 材料科学与工程学院， 山东 青岛 266580
Author(s):
WANG Xuelin 1;  2;  LI Xueda 3;  SHANG Chengjia 1
1. Collaborative Innovation Center of Steel Technology, University of Science and Technology Beijing, Beijing 100083, China;
2. Management Committee of Chongqing Tongliang High Technology Industry Development Zone, Chongqing 402560, China;
3. School of Materials Science and Engineering, China University of Petroleum, Qingdao 266580, Shandong, China
关键词:
管线钢; 冲击韧性; 焊接热影响区; 显微组织
Keywords:
pipeline steel;  impact thoughness;  welding HAZ;  microstructure
分类号:
TG115
DOI:
10.19291/j.cnki.1001-3938.2019.7.003
文献标志码:
A
摘要:
为了认清焊接过程显微组织的演变过程，对显微组织进行了精细化表征。结合多年来对高性能管线钢的研究实践，认为粗晶热影响区性能较易通过调整热输入量来改善，而对于临界粗晶热影响区，由于二次热循环峰值温度不可避免地会落在Ac1～Ac3的两相区，致使高C含量的脆性链状M-A形成，且其占比含量高，尺寸粗大，极易成为脆性裂纹的起裂源，进而恶化低温冲击韧性。为了改善临界粗晶区韧性，必须严格控制脆性M-A尺寸、分布及含量。有效方案是合理设计管线钢关键合金成分（Nb、Ni等），控制粗晶区奥氏体尺寸，促进二次热循环过程奥氏体相变更完全，以此来抑制链状M-A的形成和改善低温韧性。
Abstract:
In order to understand the evolution of microstructure in welding process, fine characterization of microstructure is carried out. Based on years of research and practice of high performance pipeline steel, it is concluded that the performance of coarse crystal heat affect zone(HAZ) is easy to be improved by adjusting heat input. For the critical coarse crystal HAZ, the peak temperature of the secondary thermal cycle inevitably falls into the two-phase zone between Ac1 and Ac3 , resulting in the formation of brittle chain M-A with high C content. Due to the high proportion and large size of M-A, it is easy to become the initiation source of brittle crack, which further worsens the low-temperature impact toughness. Therefore, in order to improve the toughness of critical coarse crystal zone, the size, distribution and content of brittle M-A must be strictly controlled. The effective scheme is to reasonably design the key alloy composition of pipeline steel , such as Nb/Ni and so on, control the austenite size of coarse crystal zone, promote the complete change of austenite phase in the secondary thermal cycle process, so as to inhibit the formation of chain M-A and improve the low temperature toughness.

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备注/Memo

备注/Memo:
收稿日期：2018-12-29
基金项目： 国家自然科学基金“高性能钢中温协变的晶体学特征及对韧性影响机理研究”（项目编号51371001）。
作者简介：王学林（1986—），男，博士后，主要从事高性能海洋工程用钢焊接物理冶金行为研究，发表论文20余篇。
更新日期/Last Update: 2019-08-16