Micro-structure and surface layer properties of 18CrNiMo7-6 steel after multistep shot peening

被引：66
作者：
Fu, Peng [1 ,2 ]
Zhan, Ke [1 ]
Jiang, Chuanhai [1 ]
机构：
[1] Shanghai Jiao Tong Univ, Sch Mat Sci & Engn, Shanghai 200240, Peoples R China
[2] Liaocheng Univ, Sch Mat Sci & Engn, Liaocheng 252059, Peoples R China
来源：
MATERIALS & DESIGN | 2013年 / 51卷
关键词：
Shot peening; Residual stresses; Phase transformation; Micro-hardness; X-RAY-DIFFRACTION; RESIDUAL-STRESSES; TIB2/AL COMPOSITE; PROFILE ANALYSIS; STAINLESS-STEEL;
D O I：
10.1016/j.matdes.2013.04.011
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
The effects of multistep shot peening on the structure and mechanical properties of 18CrNiMo7-6 steel have been investigated using X-ray diffraction line profile analysis. X-ray diffraction data reveals the phase transformation from austenite to martensitic phase after SP treatments. The results show that multistep shot peening can more significantly improve the mechanical properties. The optimal peening intensity of 0.50 + 0.30 + 0.15 mmA is found for 18CrNiMo7-6 steel. With the optimized shot peening treatment, the maximum compressive residual stress ( located at the depth of 20 mu m for martensite) and top-surface compressive residual stress of martensite attain the values of 1463 and 1256 MPa, respectively; While those of austenite are 1039 and 766 MPa, respectively. The domain size of 18CrNiMo7-6 steel decreases to 11.1 nm on the top surface after shot peening with the intensity of 0.50 + 0.30 + 0.15 mmA, and the micro-hardness on the top surface attains the peak value of 1175 HV. (c) 2013 Elsevier Ltd. All rights reserved.
引用
收藏
页码：309 / 314
页数：6
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