低活化马氏体钢限制性模压织构演化行为及力学性能研究

李萍; 宋杰; 盛杰; 严思梁; 薛克敏

doi:10.7538/yzk.2020.youxian.0447

低活化马氏体钢限制性模压织构演化行为及力学性能研究

合肥工业大学材料科学与工程学院,安徽合肥230009

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出版历程
- 刊出日期: 2021-06-19

Texture Evolutionary Behavior and Mechanical Property Characterization of Low Activation Martensitic Steel with CGP

School of Materials Science and Engineering, Hefei University of Technology, Hefei 230009, China

摘要

摘要: 利用低活化马氏体钢在500、600 ℃下进行了多道次限制性模压(CGP)实验，研究了不同温度下变形道次对其显微组织和力学性能的影响。结果表明：经3道次CGP变形后，低活化马氏体钢的平均晶粒尺寸从初始回火态的1.37 μm细化到0.88 μm；马氏体中形成了明显的（121）[012]、（011）[111]、（101）[111]织构，同时有（213）[111]织构出现，{112}{111}面织构的出现有效提升了材料的拉伸性能；铁素体中出现（012）[021]织构和明显的{013}〈113〉织构；抗拉强度与硬度显著上升，延伸率小幅降低。500 ℃下，抗拉强度经过1道次CGP变形后从初始态的586.31 MPa提升至693.01 MPa，3道次后又略下降至689.74 MPa；延伸率从初始态的18.59%降至12.13%。600 ℃下，抗拉强度经过1道次CGP变形后提升至685.97 MPa，3道次CGP变形后又略下降至679.30 MPa；延伸率降至15.62%。上述结果证明，CGP变形是提升低活化钢板力学性能的有效方法之一。
- 限制性模压 ,
- 低活化马氏体钢 ,
- 织构演化 ,
- 力学性能
Abstract: Super plastic deformation experiments of low activated Martensitic steel with multiple times of constrained groove pressing (CGP) at 500 ℃ and 600 ℃ were carried out, and the effects of deformation passes on the microstructure and mechanical properties of the steel were studied. The results show that the average grain size of the steel is refined from 1.37 μm in the initial tempering state to 0.88 μm. The content of large angle grain boundary changes slightly. After deformation, obvious (121)[012], （011）[111] and (101)[111] textures are formed in the steel, meanwhile, (213)[111] textures are formed, the appearance of {112}{111} texture in the steel effectively improves the tensile property of the material, (012)[021] textures are formed in ferrite, and the obvious {013}〈113〉 textures are formed in third pass. Among them, the appearance of {112}{111} plane texture effectively improves the tensile properties of the material. The tensile strength and hardness increase significantly, and the elongation rate decreases slightly. After deformation at 500 ℃, the tensile strength increases to 693.01 MPa after first pass, and then decreases to 689.74 MPa after third passes, and the elongation decreases from 18.59% in the initial state to 12.13%. After deformation at 600 ℃, the tensile strength increases to 685.97 MPa at first pass, and then decreases to 679.30 MPa after third pass. The elongation decreases to 15.62% after third pass. The above results prove that molding deformation is one of the effective methods to improve the mechanical properties of low activation steels.
- constrained groove pressing ,
- low activation Martensitic steel ,
- texture evolution ,
- mechanical property

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