Effect of number of layers on microstructure and mechanical properties of martensite-austenite composite steel
WANG Yao-min1, JIANG Feng1, WANG Qing-chao1, YAN Xue-feng1, YANG Zhi-nan1,2, ZHANG Fu-cheng1,2
1. National Engineering Research Center for Equipment and Technology of Cold Strip Rolling, Yanshan University, Qinhuangdao 066004, Hebei, China; 2. Metastable Materials Science and Technology State Key Laboratory, Yanshan University, Qinhuangdao 066004, Hebei, China
Abstract：The development of higher-performance steel is one of the effective ways to promote the achievement of the "dual carbon" goal. Introducing carbon diffusion is an effective method to prepare ultra-high strength-high ductility composite steels. On the basis of the previous research of the research group,composite steel with different layers was prepared by vacuum hot rolling. And the layer thickness was reduced by increasing the number of layers in composite steel. The composite steel continues the heat preservation process after hot-rolling and cladding at 1 150 ℃ to realize the diffusion of carbon elements from the high-carbon layer to the low-carbon layer. The microstructure and phase composition were analyzed by scanning electron microscope,FEI-transmission electron microscope and X-ray diffractometer. The distribution of elements was measured by electron probing microscope analysis,and the hardness and tensile properties were tested. Results revealed that the distribution of carbon elements in the composite steel changes significantly with increasing the number of layers. The carbon content in martensite layer gradually increases,and the carbon content in austenite layer gradually decreases. The concentration difference in carbon gradually decreased. The yield strength,tensile strength and total elongation of the composite steel exhibited a tendency of an initial increase followed by a decrease. When the number of inner layers of clad steel is 9 or 11,its strength and plasticity are higher than those of single-layer martensitic steel;The uniform elongation increases gradually with the increase of the number of clad steel layers,and the 15-layer clad steel achieves the maximum value (about 10.1%). The best combination was obtained in 9-layer sample,with the tensile strength (1 733 MPa) and the elongation (23.6%) being increased by 60 MPa and 7.1% respectively,as compared with the monolithic martensitic steel,meanwhile,the elongation of 9-layer sample also exceeds that of monolithic austenitic steel. Furthermore,with increasing the number of layers,resulting in a increased the proportion of austenite layer and the strength of the 15-layer sample being lower than that of the monolithic martensitic steel.
王耀民, 姜锋, 王庆超, 闫学峰, 杨志南, 张福成. 马氏体-奥氏体复合钢复合层数对组织性能的影响[J]. 钢铁, 2022, 57(11): 113-122.
WANG Yao-min, JIANG Feng, WANG Qing-chao, YAN Xue-feng, YANG Zhi-nan, ZHANG Fu-cheng. Effect of number of layers on microstructure and mechanical properties of martensite-austenite composite steel[J]. Iron and Steel, 2022, 57(11): 113-122.
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2022, Vol. 57 
