Effects of laser shock processing and shot peening on 253 MA austenitic stainless steel and their consequences on fatigue properties

被引：41
作者：
Spadaro, L. [1 ]
Herenu, S. [1 ]
Strubbia, R. [1 ]
Gomez Rosas, G. [2 ]
Bolmaro, R. [1 ]
Rubio Gonzalez, C. [3 ]
机构：
[1] CONICET UNR, Inst Fis Rosario, Bv 27 Febrero 210 Bis, RA-2000 Santa Fe, Argentina
[2] Univ Guadalajara, Ctr Univ Ciencias Exactas & Ingn, Dept Fis, Guadalajara, Jalisco, Mexico
[3] Ctr Ingn & Desarrollo Ind, Pie Cuesta 702, Queretaro 76130, Qro, Mexico
来源：
OPTICS AND LASER TECHNOLOGY | 2020年 / 122卷
关键词：
Laser shock peening without coating; Shot peening; Austenitic stainless steel; Low cycle fatigue; Microstructure; Dislocations; NEAR-SURFACE MICROSTRUCTURES; RESIDUAL-STRESS STABILITY; HIGH-CYCLE FATIGUE; PLASTIC-DEFORMATION; INDUCED MARTENSITE; CRACK INITIATION; GRAIN-REFINEMENT; BEHAVIOR; ALUMINUM; GROWTH;
D O I：
10.1016/j.optlastec.2019.105892
中图分类号：
O43 [光学];
学科分类号：
070207 ; 0803 ;
摘要：
A comparative study of the influence of laser shock peening without coating (LSPwC) and shot peening (SP) treatments on the low cycle fatigue life of 253 MA austenitic stainless steel was investigated. LSPwC treatments were performed with 2500 pulse/cm(2) and 5000 pulse/cm(2). To evaluate the effects of each treatment, residual stress, roughness, hardness, and microstructure were analyzed. It is of particular interest the correlation of the fatigue performance with the dislocation microstructure evolution. The results reveal that all the surface treatments increase the surface hardness, induce compressive residual stresses (CRS) and a high density of mechanical twins and dislocations. The stability of the work-hardened near surface microstructure results in the improvement of the fatigue life of peened 253 MA. Moreover, the best improvement of fatigue life reached for SP is mainly due to the highest number of twins and the more superficial CRS.
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页数：8
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