Journal of Jilin University(Engineering and Technology Edition) ›› 2018, Vol. 48 ›› Issue (6): 1806-1810.doi: 10.13229/j.cnki.jdxbgxb20170617

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Strengthening properties of welded joints of 22MnB5 super high strength steel

JIANG Qiu-yue1(),YANG Hai-feng2,TAN Cai-wang2   

  1. 1. School of Mechanical and Electrical Engineering, Changchun Institute of Technology, Changchun 130012, China
    2. School of Materials Science and Engineering, Harbin Institute of Technology at Weihai, Weihai 264209, China
  • Received:2017-06-13 Online:2018-11-20 Published:2018-12-11

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Abstract:

The 22MnB5 ultra high strength steel quenching joint in state welding is taken as the research object, intensive processing experiments are carried out in spinning machinery in the process of welding. The mechanical properties of the welded joints, microstructure, microhardness, corrosion resistance are tested and analyzed. The results show that the welding joint after mechanical spinning, a plastic deformation layer is formed on the joint surface. The grains in the head spinning are flattened and elongated and the grain distribution is more uniform. The tensile strength of welded joint is about 940 MPa, which is about 100 MPa higher than that of untreated welded joints. The microhardness is slightly increased, but the corrosion resistance is changed little.

Key words: materials synthesis and processing technology, 22MnB5 steel, mechanical properties, microstructure

CLC Number: 

  • TG453

Table 1

Tensile test data of 22MnB5 steel raw steel sheet and quenched steel sheet"

材料 抗拉强度σb/MPa 屈服强度σs/MPa 断后伸长率δ/%
原始钢板 502.27 354.62 26.4
淬火钢板 1725.57 - 3.52

Fig.1

Mechanical spinning head"

Fig.2

Comparison of tensile strength between unprocessed quenched-steel welded parts and spliced joints"

Fig.3

Microstructure of welded joint of 22MnB5 steel quenched steel plat"

Fig.4

Microstructure of quenched steel sheet welded by spinning"

Fig.5

Spinning joint of quenched steel plate weldment surface hardness distribution curve"

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