Effect of tempering on bonding characteristics of cross wedge rolling 42CrMo/Q235 laminated shafts
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ORIGINAL PAPER
Effect of tempering on bonding characteristics of cross wedge rolling 42CrMo/Q235 laminated shafts Shuai Zhu1 • Wen-fei Peng1 • Xue-dao Shu1 Received: 14 September 2019 / Revised: 26 January 2020 / Accepted: 26 January 2020 China Iron and Steel Research Institute Group 2020
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. Keywords Heat treatment Cross wedge rolling Interface Microstructure Fracture morphology
1 Introduction The working conditions of shafts are mostly high temperature and high pressure as well as complex environments such as stress field and temperature field [1–3], which can easily cause problems such as wear, fatigue, corrosion, fracture and failure [4–7]. How to improve the performance of shafts in complex environments is currently a hot research direction. The outer part of the shaft is an efficient part of the transmission of power and torque. The transmission efficiency of the central part is relatively low. To some extent, the center of the shaft belongs to the ‘‘dead weight’’ part. Aiming at such problems, a solution of the laminated shaft is proposed. The clad material is alloyed steel 42CrMo with high strength and excellent performance, and the substrate material is carbon steel Q235 which is inexpensive and reliable in performance. Under & Wen-fei Peng [email protected] 1
Zhejiang Provincial Key Laboratory of Part Rolling Technology, Ningbo University, Ningbo 315211, Zhejiang, China
the premise of reducing the use of precious metals, the mechanical properties and corrosion resistance of the parts are guaranteed. The cross wedge rolling process is superior to the traditional casting and forging production processes in terms of production efficiency and automation, and can also improve the working environment. Therefore, this process is adopted to realize the preparation of the laminated shaft in this paper. Rolling recombination of
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