Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
8023735 | Surface and Coatings Technology | 2018 | 9 Pages |
Abstract
In this study, multiple shot peening treatment was implemented to the SAF 2507 duplex stainless steel. The residual stress, microstructure and strain-induced transformation in the shot-peened specimens were evaluated by X-ray diffraction line profile analysis. Results pointed out that multiple shot peening was helpful to develop deep layer of high compressive residual stress with moderate work hardening. After triple shot peening treatment, a maximum compressive residual stress of â1070.5â¯MPa (at the surface for austenite) and â910.5â¯MPa (at 10â¯Î¼m depth for ferrite) were obtained. The multiple shot peening is more effective in producing the microstructure refinement than single shot peening. The depth of the refinement layer with domain size smaller than 100â¯nm reached to 150â¯Î¼m in the austenite and 100â¯Î¼m in the ferrite phase of the dually shot-peened specimen, the maximum magnitudes of which after single shot peening were 100â¯Î¼m and 75â¯Î¼m, correspondingly. The quantitative measurement of stained-induced martensite in the shot-peened samples by X-ray phase analysis revealed that larger amount of αâ²-martensite formed after multiple shot peening compared to that of single shot peening, nearly 31.6% αâ²-martensite was formed at the impacted surface of triply peened specimen. The results also demonstrated that multiple shot peening could significantly decrease the surface roughness and help to improve the surface quality.
Related Topics
Physical Sciences and Engineering
Materials Science
Nanotechnology
Authors
Ming Chen, Huabing Liu, Lianbo Wang, Chengxi Wang, Kaiyuan Zhu, Zhou Xu, Chuanhai Jiang, Vincent Ji,