Physical Simulation on Microstructure and Properties for Weld HAZ of X100 Pipeline Steel

被引：4

作者：

Liu, Yu ^{[1
]}

Yang, Liuqing ^{[1
]}

Feng, Bin ^{[1
]}

Bai, Shiwu ^{[1
]}

Xu, Changxue ^{[1
]}

机构：

[1] CNPC, Pipeline Res Inst, Langfang 065000, Peoples R China

来源：

PHYSICAL AND NUMERICAL SIMULATION OF MATERIALS PROCESSING VII | 2013年 / 762卷

关键词：

X100 pipeline steel; Physical simulation; SH-CCT; Microstructure and Properties;

D O I：

10.4028/www.scientific.net/MSF.762.556

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

In this paper, the simulation heat affected zone (HAZ) continuous cooling transformation (SH-CCT) diagram of X100 pipeline steel was drew by using Gleeble 3500-HS thermal/mechanics simulation test machine, and the microstructure and properties of the HAZ of single-pass/double-pass welding were simulated and studied. The results show that the hardening trend of X100 pipeline steel weld coarse grain HAZ (CGHAZ) is significant when using the small welding heat input. To prevent the hardening of weld CGHAZ and reduce the cold cracking sensitivity, moderate heat input welding specification (between 12 and 18 kJ/cm) and weld preheating process (between 100 and 150 C) should be adopted. When appearing obvious embriftlement, the microstructure of double-pass weld intercritically reheated coarse grain HAZ (ICCGHAZ) of X100 pipeline steel is mainly upper bainite, the precipitation and the chain-like distribution of quantity more martensite-austenite (M-A) constituents in austenite grain boundaries is one of the main reasons leading to toughness deterioration. In conclusion, optimization control measures on the microstructure and properties of X100 pipeline steel weld HAZ are presented by above comprehensive analysis.

引用

页码：556 / +

页数：2

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