The Effect of Improved Cooling on the Microstructure and Mechanical Properties of Friction Stir‐Welded Advanced High‐Strength Dual‐Phase Steel
| Autor: | Mahdi Mahmoudiniya, M. Goodarzi, Leo A.I. Kestens, Amir Hossein Kokabi |
|---|---|
| Rok vydání: | 2020 |
| Předmět: |
Materials science
Dual-phase steel Butt welding 0211 other engineering and technologies Metals and Alloys 02 engineering and technology Work hardening Welding 021001 nanoscience & nanotechnology Condensed Matter Physics Thermal diffusivity law.invention law Ultimate tensile strength Materials Chemistry Friction stir welding Physical and Theoretical Chemistry Composite material 0210 nano-technology Softening 021102 mining & metallurgy |
| Zdroj: | steel research international. 92:2000253 |
| ISSN: | 1869-344X 1611-3683 |
| DOI: | 10.1002/srin.202000253 |
| Popis: | The heat-affected zone (HAZ) softening is considered one of the most significant challenges during welding of ferrite-martensite dual-phase (DP) steels. In fact, the strain localization in the softened area results in a premature fracture that degrades the mechanical properties of the joint. Herein, the objective is to investigate the effectiveness of improved cooling using a high thermal diffusivity backing plate (BP) to reduce HAZ softening and enhance the mechanical properties of friction stir-welded DP700 steel. Accordingly, friction stir butt welding of DP700 steel was conducted using copper and mild steel BPs. The findings show that the replacement of steel BP with copper significantly reduces the weld temperature. It is also observed that the thermal diffusivity of the BP has a substantial effect on the microstructure development and mechanical properties of the welded joint. Increasing the thermal diffusivity of the BP results in a reduction of HAZ softening from 20 to 7 HV and improving tensile strength and total elongation of the joint by 40 MPa and 6.2%, respectively. Work hardening behavior and absorbed energy before the fracture are significantly improved by the replacement of steel BP with a copper. |
| Databáze: | OpenAIRE |
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