Effect of electron beam welding on microstructure and properties of quenched and tempered 15CrMnMoVA high strength steel

doi:10.13251/j.issn.0254-6051.2021.10.033

Abstract

Abstract: In order to achieve high-quality joint of aviation high-strength steel with high hardening tendency, electron beam welding process was carried out with the 15CrMnMoVA high-strength steel as the research object. For the electron beam welding joints with different structures, the microstructure characteristics and microhardness distributions were analyzed, and the mechanical properties were tested and analyzed, and the effect of electron beam welding process on the microstructure and mechanical properties of the joint was discussed. The results show that net basket martensite is formed in the weld center of the tested steel, and its microhardness is a typical saddle distribution. The tensile properties of electron beam welded joints with different lock bottom structures are basically equivalent to that of the base metal, but their fatigue properties are obviously different. When the lock bottom length is 1.5 mm, the fatigue properties of welded joints are better.

Key words: 15CrMnMoVA high strength steel, electron beam welding, microstructure, mechanical properties

CLC Number:

TG406

Yang Shiliang, Li Lihang, Dai Hao, Li Zhiyong, Zhao Tong. Effect of electron beam welding on microstructure and properties of quenched and tempered 15CrMnMoVA high strength steel[J]. Heat Treatment of Metals, 2021, 46(10): 187-192.

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