Effect of thermal cycle shocking on microstructure and mechanical properties of Stellite 12 (Co-29Cr-2.3C-3W) cobalt based alloy

To research effect of welding thermal cycle on the microstructure and mechanical properties of welded joint, two pieces of 60mm thick plates were welded together using automatic submerged-arc welding (SAW) method with suitable welding parameters. After 17 passes welding, the microstructures and phases of the welded joint was carefully observed and analyzed by using a Carl Zeiss optical microscope in different zones of welded joint, and the surface micro-hardness of the welded joint was measured systematically by using microscopic-hardness tester Lycra. Afterwards, the mechanical properties of the weld metals were measured through stretching. Through a series of measurements and observations, the welding experiment results indicate that effect of welding thermal cycle on the microstructure and mechanical properties of welding joint is great, the grains of the bottom of the weld metal are certainty smaller and more uniform, and the bottom of the weld metal have more excellent mechanical properties.

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Effect of simulated welding thermal cycle on microstructure and mechanical properties of X90 pipeline steel

Materials Science and Engineering A ◽

10.1016/j.msea.2011.06.046 ◽

2011 ◽

Vol 528 (24) ◽

pp. 7417-7422 ◽

Cited By ~ 26

Author(s):

Wengui Zhao ◽

Wei Wang ◽

Shaohui Chen ◽

Jinbo Qu

Keyword(s):

Mechanical Properties ◽

Thermal Cycle ◽

Pipeline Steel ◽

Microstructure And Mechanical Properties ◽

Welding Thermal Cycle

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Investigation on the microstructure and mechanical properties of CuCrZr after manufacturing thermal cycle for plasma facing component

Journal of Nuclear Materials ◽

10.1016/j.jnucmat.2010.12.157 ◽

2011 ◽

Vol 417 (1-3) ◽

pp. 916-919 ◽

Cited By ~ 9

Author(s):

Jeong-Yong Park ◽

Yang-Il Jung ◽

Byung-Kwon Choi ◽

Jung-Suk Lee ◽

Yong Hwan Jeong ◽

...

Keyword(s):

Mechanical Properties ◽

Thermal Cycle ◽

Microstructure And Mechanical Properties ◽

Plasma Facing Component

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Effect of rotational speeds on microstructure and mechanical properties of friction stir-welded 7075-T6 aluminium alloy

Proceedings of the Institution of Mechanical Engineers Part C Journal of Mechanical Engineering Science ◽

10.1177/0954406211404633 ◽

2011 ◽

Vol 225 (8) ◽

pp. 1761-1773 ◽

Cited By ~ 8

Author(s):

H Rezaei ◽

M H Mirbeik ◽

H Bisadi

Keyword(s):

Mechanical Properties ◽

Plastic Deformation ◽

Rotational Speed ◽

Thermal Cycle ◽

Al Alloys ◽

Friction Stir ◽

Microstructure And Mechanical Properties ◽

Average Grain Size ◽

Weld Properties ◽

Rotary Speed

In this article, effects of rotational speed on the microstructure and mechanical properties of friction stir-welded 7075-T6 Al alloys were investigated. Good correlation existed between the rotational speeds and weld properties. It was found that with increase in the rotational speed, higher pick temperatures and wider thickness of the heat-affected zone were obtained, and then grain coarsening, dissolution, and accumulation of hardening precipitates in grain boundaries. The average grain size of nugget increased from 6.8 to 8.9 µm, with increasing rotary speed from 600 to 1550 r/min. In addition, the best mechanical properties were obtained at moderate rotational speed of 825 r/min while ultimate tensile strength and elongation were 405 MPa and 6.1 per cent, respectively. Also, it was observed that at low welding speed of 60 mm/min, the weld properties are found to be dominated by the thermal cycle rather than the plastic deformation induced by tool, so as to make a reduction in hardness and strength of the weld when using higher rotational speeds.

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