Effect of shot peening on microstructure, nanocrystallization and microhardness of Ti–10V–2Fe–3Al alloy surface
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Severe plastic deformation of Ti–10V–2Fe–3Al alloy in the surface region was caused by shot peening at air pressure of 0.6 MPa with processing time ranging from 1 to 45 min. The results showed that the thickness of surface deformation layer was proportional to the processing time, the microhardness of the shot-peened surface increased from 280 to 385 HV, and the depth of highly hardening layers arrived at 200 μm. It was worth noting that a grain size gradient from nanocrystalline on the surface toward coarse grain in the matrix was obtained during the shot peening process and the minimum grain size in the top surface after shot peening was about 100–200 nm.
KeywordsTi–10V–2Fe–3Al alloy Shot peening treatment Surface nanocrystallization Martensitic transformation Microhardness
This work was supported by the National Natural Science Foundation of China (Grant No. 51361026), the Natural Science Foundation of Jiangxi Province (Grant No. 20171BAB206006), the Key Project of Science and Technology Project of Jiangxi Provincial Education Department (Grant No. GJJ160678), and Open Foundation of National Defense Key Discipline Laboratory of Light Alloy Processing Science and Technology, Nanchang Hangkong University (GF201501004).