Effect of chromium on microstructure and wear resistance of hot-rolled wear-resistant steel
LI Guan-nan1,2, SONG Ren-bo3, PEI Qing-tao1, KANG Qing-feng1, SUN Yi1
1. Technical Center, Handan Iron and Steel Group Co., Ltd., Handan 056015, Hebei, China; 2. College of Materials Science and Engineering, Chongqing University, Chongqing 400044, China; 3. School of Materials Science and Engineering, University of Science and Technology Beijing, Beijing 100083, China
Abstract:Microstructures and mechanical properties of two hot-rolled wear-resistant steels with 0 and 0.65% Cr were investigated after online laminar cooling. Wear tests of samples were carried out by MLG-130 abrasion-test equipment under the load of 60 N. Then worn surfaces of samples were studied by field emission scanning electron microscopy (SEM). These results showed that the microstructure of both wear-resistant steels consisted of ferrite and martensite/austenite constituents. Due to Cr addition, the microstructure of Cr-alloyed steel was dominated by martensite/austenite constituents, the volume fraction of which was 82.6%. Moreover, the wear resistance of the Cr-alloyed steel was better than that of the Cr-free steel after wear testing with different times. After wear testing for 0.5, 1 and 1.5 h, the abrasion weight of the Cr-alloyed steel was 0.357 8,0.769 5 and 1.427 2 g and the wear resistance is 0.48, 0.30 and 0.22 g-1, respectively. The worn surface of the Cr-free steel was characterized by furrows and peeling pits, and the main wear mechanism was micro-furrow and micro-fracture. For the Cr-alloyed steel, plastic deformation was suppressed due to its higher yield strength and hardness, which caused the worn surface became smoother and flatter, and the main wear mechanism was micro-cutting and micro-fracture.
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LI Guan-nan, SONG Ren-bo, PEI Qing-tao, KANG Qing-feng, SUN Yi. Effect of chromium on microstructure and wear resistance of hot-rolled wear-resistant steel[J]. China Metallurgy, 2021, 31(8): 35-39.
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