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RISS 인기검색어
- 검색키워드
- 저자 : Peiqing La (검색결과 2 건)
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Peiqing La,Xin Guo,Hongding Wang,Ting Shi,Xiaojuan Zhen,Fuan Wei,Xuefeng Lu 대한금속·재료학회 2016 METALS AND MATERIALS International Vol.22 No.2
Bulk 1020 carbon steel was prepared by aluminothermic reaction casting. After casting, isothermal aging treatments at different temperatures are performed for different periods up to 8 h. Microstructure characterization was performed using many methods, including optical microscopy, X-ray diffraction, scanning electron microscopy and transmission electron microscopy. It was found that the steel consisted of a nanocrystalline- ferrite matrix and a microcrystalline pearlite phase with a laminar structure. The average grain sizes of the ferrite were 23, 24, 28, and 37 nm for the cast steel and for samples annealed at 600, 800, and 1000 °C, respectively. As the annealing temperature increased, the volume fraction of the pearlite initially increased and then decreased, while the laminar spacing of pearlite increased from 240 to 900 nm. When annealed at 1000 °C, a spherical black micron pearlite particle was formed. The tensile and yield strength dramatically decreased, and the elongation varied slightly with the annealing temperature. A ductile phase was achieved by extending the holding time.
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Outstanding Synergy of Superior Strength and Ductility in Heterogeneous Structural 1045 Carbon Steel
Zhengning Li,Peiqing La,Jie Sheng,Yu Shi,Xueyuan Zhou,Qian Meng 대한금속·재료학회 2021 METALS AND MATERIALS International Vol.27 No.8
Superior strength-ductility synergy of 1045 carbon steel produced by aluminothermic reaction casting method was obtainedthrough large deformation rolling at ambient temperature and subsequent annealing, meanwhile, a heterogeneous compositestructure was fabricated. The heterogeneous structural 1045 carbon steel consists of “soft” microcrystalline/ultrafine grained(UFG) ferrite and “hard” cementite nanoparticles. The outstanding strength-ductility synergy was primarily attributed tothe microstructure characteristics about the “soft/hard” interfaces of heterogeneous composite structure. The strength wasimproved due to the second phase reinforcement of hard cementite nanoparticles and decreasing of ferrite grain size, meanwhile,the back stress hardening capacity of “soft/hard” phase also resulted in the high strength. And the favorable ductilitywas ascribed to the generation of geometrically necessary dislocations (GNDs) around “soft/hard” interfaces, which resultedin the high work hardening capability of heterogeneous structural 1045 carbon steel. It is remarkable that tensile strength(∼ 1190 MPa) and high yield strength (∼ 1118 MPa) and good ductility (∼10.6%) can be simultaneously acquired for thecold rolled 1045 steel after annealing at 673 K for 1 h.
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