|
|
|
| |
|
|
| 本文已被：浏览 340次 下载 385次 |
码上扫一扫！ |
|
|
| 9Ni钢自保护药芯焊丝的研制及分析 |
|
张敏, 张明, 李继红
|
|
西安理工大学 材料科学与工程学院, 西安 710048
|
|
| 摘要: |
| 研制了以Fe-Ni-Mn-Si系为合金系的9Ni钢自保护药芯焊丝. 采用FCAW法在不加保护气体的条件下施焊,并对焊件进行了QLT(淬火+亚温淬火+回火)处理. 通过拉伸试验、低温冲击试验、金相分析、断口扫描等方法研究了焊接接头的力学性能、显微组织和断口形貌. 结果表明,所研制的药芯焊丝焊接接头抗拉强度为709 MPa,屈服强度为580 MPa,断后伸长率为26%,断面收缩率为47%. 力学性能满足9Ni钢的使用要求. 焊缝的组织为细晶铁素体+针状铁素体. QLT处理使焊缝的低温冲击吸收功从48 J/cm2提升至100 J/cm2,能够明显提高焊缝的低温韧性. |
| 关键词: 9Ni钢 自保护药芯焊丝 力学性能 显微组织 QLT处理 |
| DOI： |
| 分类号: |
| 基金项目:国家高新技术研究发展计划资助项目(863计划,2013AA-031303);国家自然科学基金资助项目(51274162) |
|
| Development and performance analysis of self-shielded flux cored wire for 9%Ni steel |
|
ZHANG Min, ZHANG Ming, LI Jihong
|
|
College of Material Science and Engineering, Xi'an University of Technology, Xi'an 710048, China
|
| Abstract: |
| Self-shielded flux cored wire for 9%Ni steel with Fe-Ni-Mn-Si alloy system was developed. This wire was welded by FCAW with no shielding gas. QLT heat treatment was carried out after welding. Mechanical properties, microstructure, and fracture morphology of welded joint were studied by tensile testing, low temperature impact testing,metallurgical analysis, and SEM. The results show that, The tensile strength of welded joint is 709 MPa,the yield strength is 580 MPa, elongation ratio is 26%, section shrinkage rate is 47%. The mechanical properties meet the requirement of the use of 9%Ni steel. The microstructure of the weld metal consists of fine grain ferrite and acicular ferrite. QLT heat treatment increased low temperature impact energy of weld metal from 48 J/cm2 to 100 J/cm2. It can significantly improve the low temperature toughness of the weld. |
| Key words: 9%Ni steel self-shield flux cored wire mechanical properties microstructure QLT heat treatment |
|
|
|
|
