Effect of Heat Treatment Process on Microstructure Evolution and Performance of 45Mn2 Steel
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ORIGINAL ARTICLE
Effect of Heat Treatment Process on Microstructure Evolution and Performance of 45Mn2 Steel Xiaole Cheng1 • Jie Liu1 • Shouhai Li2 • Yinhu Qu1 • Guangshen Xu1 Hanguang Fu1
•
Received: 5 March 2020 / Accepted: 10 August 2020 Ó The Indian Institute of Metals - IIM 2020
Abstract Through the heat treatment of 0.8Cr–2.2Mn– 0.3Mo–1.0Si–0.004B–0.45C (wt%) bainitic steel (i.e., 45Mn2 bainitic steel), the influence of different heat treatment parameters on microstructure evolution and mechanical properties of 45Mn2 bainitic steel was studied. Optical microscope, Scanning electron microscope, X-ray diffraction, hardness testing and abrasion testing were used for analysis. The results show that the microstructure of 45Mn2 bainitic steel after quenching is lower bainitic ferrite ? residual austenite ? M/A. When the austenitizing temperature increases, the volume fraction of residual austenite and M/A increases, and the hardness and abrasion resistance first increase and then decrease. At 910 °C, the hardness is the highest, while the wear resistance is the best. After quenching at 910 °C and different tempering temperatures, it is found that the microstructure has no obvious change, and the hardness and wear resistance are the highest when tempered at 240 °C. Keywords Bainitic steel Heat treatment parameter Microstructure evolution Hardness Abrasion resistance
& Hanguang Fu [email protected] Xiaole Cheng [email protected] 1
School of Mechanical and Electrical Engineering, Xi’an Polytechnic University, Jinhua Road No. 19, Beilin District, Xi’an 710048, Shaanxi Province, People’s Republic of China
2
Sichuan Huanglong Intelligent Crushing Technology Co., Ltd., Jiangyou 621700, Sichuan Province, People’s Republic of China
1 Introduction With the rapid growth of industry, the demand for metallic materials increases, and they are widely used in aerospace, electric power, metallurgy, mining machinery and transportation industries. However, many equipment and components are prone to component failure due to wear and tear, resulting in huge waste of materials and economic loss. Therefore, wear-resistant steel is widely used in engineering machinery field [1]. In the 1950s, the British Irvine and Pickering invented the Mo–B series air-cooled bainitic steel [2]. The combination of Mo and B elements results in a bainitic structure in steel under continuous cooling conditions, paying more emphasis on Mo–B series bainitic wear-resistant steels. In the 1970s, Fang Hongsheng of Tsinghua University developed Mn–B series bainitic wear-resistant steel. By combining Mn and B elements, the incubation period of high-temperature transformation is improved [3, 4]. A lot of studies have indicated that the addition of different alloy elements can enhance the toughness and abrasion resistance of bainitic wear-resistant steel. Among them, Si element can inhibit the carbide precipitation, make austenite carbon-rich and improve the stability of film-like residual austenite [5–7]. The addition of Mn element expands the aus
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