焊管2012，Vol.35Issue(10)：10-15,6.
预热温度和冷却速度对X80抗大变形管线钢焊接粗晶区性能的影响
Effect of Pre-heat Temperature and Cooling Rate on Properties in Coarse Grain Heat-affected Zone for X80 High Deformability Pipeline Steel
何小东 1王月霞 1吴双 1仝珂 1朱丽霞 1蔺卫平1
作者信息
- 1. 中国石油集团石油管工程技术研究院,西安710065
- 折叠
摘要
Abstract
Implant test and thermal simulating technology were used to study the effect of pre-heat temperature and cooling rate on cold cracking sensibility and structure and properties in coarse grain heat-affected zone(CGHAZ)for X80 high deformability pipeline steel. The experimental results showed that with the pre-heat temperature increasing, the critical fracture stress and the resistance of cold cracking in welding coarse zone were enhanced. When the pre-heat temperature reached 150 ℃ , the sensibility of cold cracking became so small, and the fracture surface presented toughness cavity. With the cooling rate increasing, the micro-hardness in CGHAZ became greater, but the fracture toughness was from high to low, and then from low to high. When the cooling rate achieved to 2 ～ 25 ℃/s, the CGHAZ showed excellent toughness. However, when the cooling rate was increased further, the fracture toughness reduced rapidly because of martensite formation.关键词
X80抗大变形管线钢/粗晶区/冷裂纹敏感性/断裂韧性/插销试验/热模拟Key words
X80 high deformability pipeline steel/ coarse grain zone/cold cracking sensibility/ fracture toughness/ implant test/ thermal simulation分类
矿业与冶金引用本文复制引用
何小东,王月霞,吴双,仝珂,朱丽霞,蔺卫平..预热温度和冷却速度对X80抗大变形管线钢焊接粗晶区性能的影响[J].焊管,2012,35(10):10-15,6.
