Effect of intercritical annealing on microstructure,mechanical properties,and work-hardening behavior of ultrahigh-strength dual-phase steels with different silicon contents

查看全文 作　　者：LI [1,2,3]Wei1;John G [4]SPEER;ZHU [1]Xiaodong;LI [1]Wei

机构地区：[1]School of Materials Science and Engineering,University of Shanghai for Science and Technology,Shanghai 200093,China;[2]Research Institute,Baoshan Iron &Steel Co.,Ltd.,Shanghai 201900,China;[3]State Key Laboratory of Development and Application Technology of Automotive Steels (Baosteel),Shanghai 201900,China;[4]Advanced Steel Processing and Products Research Center,Colorado School of Mines,1500 Illinois St.,Golden,Colorado 80401,USA

出　　处：《Baosteel Technical Research》索引2018年第12卷第4期,共8页

摘　　要：In this study,three kinds of dual-phase( DP) steels were used to investigate the influence of silicon content and intercritical annealing temperature on their microstructures,mechanical properties,and work-hardening behaviors. By adding silicon and matching the critical annealing temperature,a new DP steel( 1. 0Si and intercritically annealed at 790 ℃) that exhibits an excellent combination of ultrahigh strength and adequate ductility was obtained. Variations in the strength,elongation,and fracture mechanism of the specimens with respect to different intercritical annealing temperatures were correlated to microstructural features. With an increase in the silicon content,there is no significant change in the martensitic band structure or ferrite morphology. At the same annealing temperature,the yield strength and yield strength ratio of the specimens decreased,but at different annealing temperatures,the tensile strength was reduced. The Hollomon analysis results indicate that the workhardening behavior obeys a two-stage work-hardening mechanism. With an increasing intercritical annealing temperature,the 'transition strain'shifts to the left,and with an increasing silicon content,the 'transition strain'shifts to the right. The surface exhibits ductile fractures characterized by a high density of microvoid dimples. With an increase in the silicon content,the average dimple size on the fracture surface decreases and the plasticity of the material increases. 关键词：DUAL-PHASE steel THERMOMECHANICAL processing MICROSTRUCTURE mechanical

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Effect of intercritical annealing on microstructure,mechanical properties,and work-hardening behavior of ultrahigh-strength dual-phase steels with different silicon contents

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