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The metallurgical changes and micro defects after welding can influence the mechanical property, corrosion resistance and dimensional stability of the stainless steel wielding joints. It is necessary to explore an effective post-welded method to improve the service performance for stainless steel welding joints. Furthermore, the essential mechanism between microstructure changes and macro-property variation during this process needs deep reveal. Therefore, this paper aims at investigating the effects of different post-weld treatments including naturally aging, artificial aging and cryogenic treatment on the residual stress and mechanical properties of 304 stainless steel weldments. The microstructure evolution was also studied to reveal and establish the microstructure-performance relationship. Considering the application of austenitic stainless steel in aerospace industry, mechanical properties at low temperature is also tested and compared with room temperature condition. This work verifies cryogenic treatment as a prospective post treatment for improving the welding performance of stainless steel welding joint, without prolonging the implementation period and damaging the microstructure when compared with naturally and artificial aging treatments.
| Submitters Country | 中国 |
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