电焊机2017，Vol.47Issue(8)：1-8,8.DOI:10.7512/j.issn.1001-2303.2017.08.01
大线能量焊接EH36船板钢FCB焊接接头组织与性能
Microstructure and properties of FCB weld joint of shipbuilding steel EH36 for high heat input welding
李文晓 1郭慧英 1陈刚 1张宇1
作者信息
- 1. 江苏省(沙钢)钢铁研究院,江苏张家港215625
- 折叠
摘要
Abstract
FCB welding with an heat input of 228 kJ/cm was applied to butt weld newly developed 32 mm thick shipbuilding steel plate EH36,and the microstructure and mechanical properties of the weld joint were examined.Super coarse grain heat affected zone of the weld joint mainly consists of intra-granular nucleated ferrite and small amount of grain boundary ferrite.The size of prior austenite grain is 300～ 500 μm,which is caused by longer soaking at high temperatures during thermal cycle.In this paper,δ phase-transition temperature and relationships between austenite grain size and peak temperatures are given.Coarse grain heat affected zone mainly consists of 15～30 μm acicular ferrite and 3～10 μm acicular ferrite.A microstructure consisting of 10～20 μm acicular ferrite and ≤ 10 μm pearlite is observed in fine grain heat affected zone.Inter-critical heat affected zone consists of mixed grains.The heat affected zone exhibits an absorbed energy larger than 100 J at-20 ℃ during CVN impact test.The weld joint failed in the base metal during transverse tensile testing,and other properties meet the requirement.关键词
FCB焊接/船板钢EH36/原奥氏体晶粒/热影响区Key words
FCB welding/shipbuilding steel EH36/prior austenite grain/heat affected zone分类
矿业与冶金引用本文复制引用
李文晓,郭慧英,陈刚,张宇..大线能量焊接EH36船板钢FCB焊接接头组织与性能[J].电焊机,2017,47(8):1-8,8.
