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Effect of tempering on bonding characteristics of cross wedge rolling 42CrMo/Q235 laminated shafts

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Abstract

To further improve the comprehensive properties of 42CrMo/Q235 laminated shafts produced by cross wedge rolling, the heat treatment of the shafts was studied. Tensile and bending tests were carried out to compare the changes in mechanical properties before and after heat treatment. The results showed that the interfacial bonding strength increased most after tempering at 350 °C for 45 min. The microstructure of the interface was observed using a digital microscope. The results showed that the dispersed oxides on the interface were basically eliminated by using the scheme of tempering at 350 °C and holding for 45 min. The reasons for the change in mechanical properties were explained from the point of the interfacial microstructure. Scanning electron microscopy was used to analyze the micro-morphology of the tensile fracture. It was observed that after tempering at 350 °C and holding for 45 min, the dimple holes became larger and deeper, and the structure of fracture became more uniform and stable. From the point of the tensile fracture morphology, the reasons for the change in mechanical properties were explained as well.

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Acknowledgements

This project was supported by the Fundamental Research Funds for the Provincial Universities of Zhejiang (No. SJLZ 2021002), the Natural Science Foundation of Zhejiang Province (Grant No. LY18E050006) and the Natural Science Foundation of Ningbo City (Grant No. 2017A610088), and the Ningbo Science and Technology Innovation 2025 Major Project (2018B10004, 2019B10100) and National Natural Science Foundation of China (Grant No. 51405248). The authors would like to gratefully acknowledge the support of K.C. Wong Magna Fund in Ningbo University.

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Correspondence to Wen-fei Peng.

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Zhu, S., Peng, Wf. & Shu, Xd. Effect of tempering on bonding characteristics of cross wedge rolling 42CrMo/Q235 laminated shafts. J. Iron Steel Res. Int. 27, 1170–1178 (2020). https://doi.org/10.1007/s42243-020-00488-9

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  • DOI: https://doi.org/10.1007/s42243-020-00488-9

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