Comparison of microstructure and mechanical properties of ultra-narrow gap laser and gas-metal-arc welded S960 high strength steel |
| |
| Institution: | 1. Laser Processing Research Centre, School of Mechanical, Aerospace and Civil Engineering, The University of Manchester, Sackville Street, Manchester M13 9PL, UK;2. National Key Lab for Remanufacturing, 21 Dujiakan, Fengtai, Beijing 100072, China;3. Tata Steel, Research & Development, Swinden Technology Centre, Moorgate, Rotherham, South Yorkshire S60 3AR, UK;1. Shagang School of Iron and Steel, Soochow University, Suzhou 215021, Jiangsu, China;2. Laser Processing Research Center, Soochow University, Suzhou 215021, Jiangsu, China;3. Laboratory for Excellence in Advanced Steel Research, Department of Metallurgical, Materials and Biomedical Engineering, University of Texas at El Paso, TX 79968, USA;1. Laser Processing Research Centre, School of Mechanical, Aerospace and Civil Engineering, The University of Manchester, Manchester M13 9PL, UK;2. School of Materials, The University of Manchester, Manchester M13 9PL, UK;3. School of Aerospace, Transport and Manufacturing, Cranfield University, Cranfield MK43 0AL, UK;1. School of Mechanical, Aerospace and Civil Engineering, The University of Manchester, Manchester M13 9PL, UK;2. Shanghai Rui Rong Laser Welding Technology Co. Ltd., Shanghai 201306, China;3. Dalton Nuclear Institute, The University of Manchester, Manchester M13 9PL, UK |
| |
| Abstract: | The microstructural characteristics and mechanical properties, including micro-hardness, tensile properties, three-point bending properties and Charpy impact toughness at different test temperatures of 8 mm thick S960 high strength steel plates were investigated following their joining by multi-pass ultra-narrow gap laser welding (NGLW) and gas metal arc welding (GMAW) techniques. It was found that the microstructure in the fusion zone (FZ) for the ultra-NGLW joint was predominantly martensite mixed with some tempered martensite, while the FZ for the GMAW joint was mainly consisted of ferrite with some martensite. The strength of the ultra-NGLW specimens was comparable to that of the base material (BM), with all welded specimens failed in the BM in the tensile tests. The tensile strength of the GMAW specimens was reduced approximately by 100 MPa when compared with the base material by a broad and soft heat affected zone (HAZ) with failure located in the soft HAZ. Both the ultra-NGLW and GMAW specimens performed well in three-point bending tests. The GMAW joints exhibited better impact toughness than the ultra-NGLW joints. |
| |
| Keywords: | As welded condition Heat input Cooling rate Toughness Hardness Martensite |
| 本文献已被 ScienceDirect 等数据库收录！ |
|
