焊管2013，Vol.36Issue(6)：68-72,5.
快速冷却对X120高强度管线钢热影响区微观组织和韧性的影响
Effect of Fast Cooling Process on the Microstructure and Toughness of Heat-affected Zone in a High Strength Pipeline Steel X120
马立立 1李雅可 1郭锦龙 1王涛 1钱勇1
作者信息
- 1. 渤海装备南京巨龙钢管有限公司,南京210061
- 折叠
摘要
Abstract
A process for improving the heat-affected zone toughness by fast cooling during welding was developed.The holding time at high temperature above A c3 and the cooling time from 800 ℃ to 500 ℃ were decreased when welding thermal cycle was experienced by fast cooling process.The microstructures in the heat-affected zone with varied thermal cycles were examined by optical and scanning electron microscopes.The shorten holding time led to thinner heat-affected zone width and finer austenite grains in the fusion line and coarse-grained heat-affected zone; while the decreased cooling time from 800 ℃ to 500 ℃ resulted in finer bainitic ferrite in the heat-affected zone.Martensite-austenite constituents in the fusion line were reduced in amount and size and predominantly changed into film-like in shape.Experimental results indicated that the fast cooling process played an important role in improving the heat-affected zone toughness of pipeline steel X120.关键词
管线钢/快速冷却/热影响区/微观组织/冲击韧性Key words
pipeline steel/ fast cooling process/ heat-affected zone/ microstructure/ impact toughness分类
矿业与冶金引用本文复制引用
马立立,李雅可,郭锦龙,王涛,钱勇..快速冷却对X120高强度管线钢热影响区微观组织和韧性的影响[J].焊管,2013,36(6):68-72,5.
