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| Microstructure and properties of Fe-Mn-C medium-Mn steel processed by ART-annealing |
| SUN Rong-min1, LI Guo-yang2,3, WANG Hui1, WANG Cun-yu1, WANG Yu-hui2,3, CAO Wen-quan1 |
1. Institute of Special Steels,Central Iron and Steel Research Institute, Beijing 100081, China;
2. State Key Laboratory of Metastable Materials Science and Technology,Yanshan University, Qinhuangdao 066004, Hebei, China;
3. National Engineering Research Center for Equipment and Technology of Cold Rolled Strip,Yanshan University, Qinhuangdao 066004, Hebei, China |
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Abstract In order to study the microstructure and properties of Fe-Mn-C medium-Mn steel processed by ART-annealing,based on Fe-5Mn-0.2C medium-manganese steel after ART-annealing for 1,10 and 360 min,its structure was characterized by XRD and SEM,and its tensile properties and wear resistance were tested by WE-300 tensile testing machine and ML-10 pin-disc abrasive wear testing machine, respectively. The results show that the retained austenite nucleates and grows between the original martensite laths during the ART annealing process,and the original martensite structure gradually transforms into a composite structure composted of the alternately distributed ferrite and austenite lath. With increasing the ART annealing time (1,10 and 360 min),the volume percent of retained austenite continues to increase (from 18.4% to 33.6%). The comprehensive mechanical properties and wear resistance of the Fe-5Mn-0.2C steel significantly improved with the increase of retained austenite volume percent,the product of tensile strength and total elongation increased from 25 613 to 44 496 MPa·%,and its wear resistance reached the similar ability of ZGMn13 steel and Hardox450 wear-resistant steel.
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Received: 04 November 2020
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2021, Vol. 56 
