Effect of quenching-partitioning treatment on the microstructure, mechanical and abrasive properties of high carbon stee
- PDF / 2,529,214 Bytes
- 12 Pages / 592.8 x 841.98 pts Page_size
- 81 Downloads / 241 Views
Effect of quenching-partitioning treatment on the microstructure, mechanical and abrasive properties of high carbon steel Jian-ping Lai 1,2), Jia-xin Yu 1,2), and Jiong Wang 3) 1) Key Laboratory of Testing Technology for Manufacturing Process in Ministry of Education, Mianyang 621010, China 2) School of Manufacturing Science and Engineering, Southwest University of Science and Technology, Mianyang 621010, China 3) Central Sichuan Oil-Gas District, Petro-China Southwest Oil and Gas Field Company, Suining 629000, China (Received: 8 June 2020; revised: 3 August 2020; accepted: 5 August 2020)
Abstract: The present work employed the X-ray diffraction, scanning electron microscopy, electron backscattered diffraction, and electron probe microanalysis techniques to identify the microstructural evolution and mechanical and abrasive behavior of high carbon steel during quenching-partitioning treatment with an aim to enhance the toughness and wear resistance of high carbon steel. Results showed that, with the increase in partitioning temperature from 250 to 400°C, the amount of retained austenite (RA) decreased resulting from the carbide precipitation effect after longer partitioning times. Moreover, the stability of RA generally increased because of the enhanced degree of carbon enrichment in RA. Given the factors affecting the toughness of high carbon steel, the stability of RA associated with size, carbon content, and morphology plays a significant role in determining the toughness of high carbon steel. The analysis of the wear resistance of samples with different mechanical properties shows that hardness is the primary factor affecting the wear resistance of high carbon steel, and the toughness is the secondary one. Keywords: high carbon steel; quenching and partitioning; microstructural evolution; retained austenite
1. Introduction To date, less attention has been paid to wear-resistant high carbon steel because it is difficult to achieve a good combination of wear resistance and toughness in high carbon steel, which limits its application to conditions requiring considerable toughness [1–2]. For example, under high-impact conditions, high carbon steel often fails through brittle fracture with no appreciable toughness during abrasion. Thus, the improvement of toughness is of significance to further extend the application of high carbon steel. The innovative approach of incorporating a large amount of retained austenite (RA) in a multiphase microstructure through a series of heat treatment processes can help to enhance the toughness of traditional brittle high carbon steels [3–4]. The presence of soft RA can effectively accommodate strain and inhibit crack propagation at the interface between the surrounding hard phase and the RA via the transformation-induced plasticity (TRIP) effect during deformation, resulting in the significant improvement of toughness [5–6]. The wear resistance is also enhanced by surface work hardening
through the abrasion-induced martensitic transformation of
Data Loading...
