热处理对超低碳CrMnN奥氏体不锈钢焊接接头性能的影响
Effect of Heat Treatment on Properties of Ultra-Low Carbon CrMnN Austenitic Stainless Steel Welded Joints
王维东 1汪海涛 1王亮 1王维亮 1鲜林云 1郭克星 1房世超2
作者信息
- 1. 中国石油宝鸡钢管有限责任公司, 陕西 宝鸡 721008;中油国家石油天然气管材工程技术研究中心有限公司,陕西 西安 710000;陕西省高性能连续管重点实验室, 陕西 宝鸡 721008
- 2. 中国石油宝鸡钢管有限责任公司, 陕西 宝鸡 721008
- 折叠
摘要
采用等离子弧焊接对QN1804L(下称 18Cr)超低碳CrMnN奥氏体不锈钢进行焊接,并对焊接接头分别进行形变热处理和固溶处理.结果表明:焊态下接头组织由奥氏体和铁素体组成,铁素体呈骨架和板条状分布在奥氏体组织中间,焊缝硬度略高于母材的;形变热处理后焊缝组织发生扭曲,晶粒被拉长,焊缝硬度远高于母材的;同时由于形变强化,焊缝强度也明显提高.固溶处理后焊缝中的铁素体在高温转变为奥氏体,未及时转变的呈点状分布,焊缝硬度与母材的基本保持一致;不同热处理后的焊缝均具有较好的耐腐蚀性能.
Abstract
QN1804L ultra-low carbon CrMnN austenitic stainless steel was welded by plasma arc welding,and the welded joints were treated by thermomechanical treatment and solid solution treatment,respectively.The results show that the microstructure of the joint in welded state is composed of austenite and ferrite,the ferrite is distributed between austenite grains in skeleton and strip shape,and the hardness of the weld is slightly higher than that of base metal.After thermomechanical treatment,the weld microstructure is distorted,the grains are elongated,and the hardness of the weld is much higher than that of the base metal.At the same time,due to deformation strengthening,the weld strength is also significantly improved.After solid solution treatment,the ferrite in the weld transforms into austenite at high temperature,and those phase not transformed in time are distributed in spot,and the hardness of the weld is basically consistent with that of the base metal.The welds after different heat treatment have good corrosion resistance.
关键词
奥氏体不锈钢/等离子弧焊/形变热处理/固溶热处理/腐蚀性能Key words
austenitic stainless steel/plasma arc welding/thermomechanical treatment/solution heat treatment/corrosion performance引用本文复制引用
基金项目
中国石油科学研究与技术开发项目(GF2019E-25)
出版年
2024
NETL
NSTL
万方数据