铸造技术2017，Vol.38Issue(4)：932-934,941,4.DOI:10.16410/j.issn1000-8365.2017.04.050
热输入对Q550D高强钢热影响区组织和性能的影响
Effect of Heat Inputs on HAZ Microstructure and Properties of Q550D High Strength Steel
程志辉 1程雄2
作者信息
- 1. 湖北工业大学,湖北武汉430068
- 2. 武昌工学院机械工程学院,湖北武汉430065
- 折叠
摘要
Abstract
The Gleeble3800 thermal simulation testing machine was used to conduct the thermal simulation test on the Q550D steel for engineering machinery under different heat inputs.The microstructure of the samples was observed,the impact toughness and hardness were tested,and the impact fracture morphology was analyzed.The results show that the main microstructure of the CGHAZ is bainite,and a small amount of granular bainite appears in the microstructure when the line energy is more than 20 kJ/cm.With the increase of heat inputs,the original austenite grain and bainite lath martensite gradually coarsens and the average hardness of CGHAZ value gradually decreases,the CGHAZ is hardened when the line energy is below 15 kJ/cm,and is softened when the line energy is above 30 kJ/cm.The impact energy decreases with the increase of heat inputs gradually,and the CGHAZ impact toughness is seriously deteriorated especially when the line energy is above 20 J/cm.关键词
Q550D高强钢/焊接热模拟/热影响区Key words
Q550D high strength steel/welding thermal simulation/HAZ分类
矿业与冶金引用本文复制引用
程志辉,程雄..热输入对Q550D高强钢热影响区组织和性能的影响[J].铸造技术,2017,38(4):932-934,941,4.
