标题: | Effect of post-weld heat treatments on microstructure and mechanical properties of electron beam welded flow formed maraging steel weldment |
作者: | Lee, Y.-J. Lee, I.-K. Wu, S.-C. Kung, M.-C. Chou, C.-P. 机械工程学系 Department of Mechanical Engineering |
关键字: | C-250 maraging steel;flow forming;electron beam welding;heat treatment;reversion austenite |
公开日期: | 1-五月-2007 |
摘要: | Seamless tubing of C-250 maraging steel manufactured by the flow forming technique was joined by the electron beam welding process. Various post-welding heat treatments were conducted to improve the overall mechanical properties of the welded tubing. For the 480 degrees C/6h/air cooling post-weld aging treated maraging steel, a significant increment of 11% reversion austenite was present in the weld metal. Only the tensile strength of this aging treated metal met the required specification while its percentage elongation reached only 50% of the specification, attaining only 35% of the strength of the parent metal. For the post-welded solution +/- aging treated maraging steel, only the yield strength met the specification. Moreover, a significant amount of reversion austenite pools was also present at the grain boundaries of the material located at the weld metal. Although the homogenisation treatment could improve the hardness of the weld metal, it failed to have the tensile strength of the steel met the specification. |
URI: | http://dx.doi.org/10.1179/174329307X173689 http://hdl.handle.net/11536/10858 |
ISSN: | 1362-1718 |
DOI: | 10.1179/174329307X173689 |
期刊: | SCIENCE AND TECHNOLOGY OF WELDING AND JOINING |
Volume: | 12 |
Issue: | 3 |
起始页: | 266 |
结束页: | 273 |
显示于类别: | Articles |