Title: | Enhancement of mechanical properties of electron beam-welded D6ac steel tube |
Authors: | Wu, S. C. Tseng, K. H. Wen, H. C. 機械工程學系 Department of Mechanical Engineering |
Keywords: | D6ac steel;Forward flow forming;Electron beam welding;Post-weld heat treatment;Mechanical properties |
Issue Date: | 1-Apr-2015 |
Abstract: | A forward flow-formed D6ac steel tube was joined through the electron beam welding process and was then subjected to post-weld heat treatment. The mechanical properties and hardness profiles of the as-welded (without heat treatment after welding) steel and different post-weld heat treatment weldments were investigated. The results show that the as-welded D6ac steel exhibited very poor mechanical strength and elongation. After post-weld heat treatment, a large improvement in the mechanical properties of the weldment was achieved. Forward flow-formed D6ac electron beam weldment subjected to post-weld heat treatment at 350 degrees C reached the largest yield strength and ultimate tensile strength values (approximately 1359.2 and 1494.3 MPa, respectively). Forward flowformed D6ac electron beam weldment subjected to post-weld heat treatment at a temperature of 650 degrees C exhibited an overtempered state, which led to mechanical strength and hardness deteriorations of the weldment. This study found that the forward flow-formed D6ac electron beam weldment heat-treated at 350-450 degrees C and held at this temperature range for 2 h exhibits high mechanical strength, sufficient elongation and a yield strength/ultimate tensile strength ratio of 0.91. |
URI: | http://dx.doi.org/10.1179/1432891715Z.0000000001363 http://hdl.handle.net/11536/124847 |
ISSN: | 1432-8917 |
DOI: | 10.1179/1432891715Z.0000000001363 |
Journal: | MATERIALS RESEARCH INNOVATIONS |
Volume: | 19 |
Begin Page: | S32 |
End Page: | S35 |
Appears in Collections: | Articles |