焊接热输入对EH36船板钢显微组织和力学性能的影响  

Influence of Welding Heat Input on Microstructure and Mechanical Properties of EH36 Ship Plate Steel

作　　者：纪久张 张朋彦 董陈 张迪 JI Jiuzhang;ZHANG Pengyan;DONG Chen;ZHANG Di(School of Metallurgical Engineering,Anhui University of Technology,Ma’anshan 243002,Anhui China)

机构地区：[1]安徽工业大学冶金工程学院,安徽马鞍山243002

出　　处：《热处理》2022年第5期14-18,24,共6页Heat Treatment

摘　　要：采用Gleeble热模拟机对传统热轧机械控制工艺生产的EH36船板钢进行了模拟焊接试验,焊接热输入分别为100 kJ/cm和200 kJ/cm。对热模拟试验后的钢进行了-20℃冲击试验、硬度测试和金相检验。结果表明:在两种焊接热输入条件下,焊缝热影响区严重软化,冲击韧度较低,均为脆性断裂,不满足船级社的要求;以200 kJ/cm的热输入焊接的EH36船板钢热影响区晶粒粗化严重,部分晶粒尺寸达200μm以上,晶界铁素体和侧板条铁素体较多,针状铁素体较少。The simulated welding tests for EH36 ship plate steel produced by traditional thermo-mechanical control process(TMCP) were carried out by means of a Gleeble thermal simulator, welding heat inputs being 100 and 200 kJ/cm, respectively. The steel plate was tested for impact toughness at-20 ℃, hardness and microstructure after thermal simulation test. The results showed that(a) under the two welding heat input conditions, heat affected zone(HAZ) of the weld was seriously softened, gave lower impact toughness, and exhibited brittle fracture, which did not meet the requirements of ship classification societies;(b) the EH36 ship plate steel welded at heat input of 200 kJ/cm displayed seriously coarser grains in HAZ of welded joint, some of the grain was as great size as 200 μm or more, and had more grain boundary ferrite and more side lath ferrite, and less acicular ferrite.

关 键 词：EH36船板钢 焊接热模拟 脆性断裂 冲击韧度 

分 类 号：TG407[金属学及工艺—焊接]