摘要
利用透射电子显微镜、X射线衍射仪对不同冷拔应变量下70钢丝的珠光体片层间距、渗碳体片层厚度、位错密度以及抗拉强度进行了测定。结果表明,随着真应变从0增加到1.24,珠光体平均片层间距由140 nm减小至70 nm,渗碳体平均片层厚度由37 nm减小至20 nm,位错密度由8.4×10^(13)m^(-2)增加到1.3×10^(15)m^(-2),抗拉强度则由1168 MPa增加到1545 MPa,铁素体晶粒内部形成<110>丝织构。基于金属材料经典强化理论和模型,分别计算出不同应变下位错强化和边界强化对钢丝总强度的贡献。结果表明,边界强化为最主要强化机制,其次为位错强化;当应变为1.24时,边界强化、位错强化分别达到1096 MPa和333 MPa。
The pearlite lamellar spacing,cementite lamellar thickness,dislocation density and tensile strength of 70 steel wire with different cold drawing strains were measured by transmission electron microscope and X ray diffractometer.The results show that with the increase of true strain form 0 to 1.24,the average lamellar spacing of pearlite decreases from 140 nm to70 nm,the average lamellar thickness of cementite decreases from 37 nm to 20 nm,and the dislocation density increases from 8.4×1013m-2 to 1.3×1015m-2.The tensile strength increases from 1168 MPa to 1545 MPa.The<110>wire texture is formed in ferrite grains.Based on the classical strengthening theory and model of metal materials,the contribution of dislocation strengthening and boundary strengthening to the total strength of the steel wire under different strains was calculated respectively.The results show that boundary strengthening is the most important strengthening mechanism,and the second is dislocation strengthening.When the strain is 1.24,the boundary strengthing and dislocation strengthening reach 1096 MPa and 333 MPa,respectively.
作者
陈焕友
李烈军
邢献强
彭政务
CHEN Huanyou;LI Liejun;XING Xianqiang;PENG Zhengwu(National Engineering Research Center of Near-net-shape Forming for Metallic Materials,South China University of Technology,Guangzhou 510640,China;Guangdong Key Laboratory for Advanced Metallic Materials Processing,South China University of Technology,Guangzhou 510640,China;Guangzhou Orsa Steel Wire Technology Co,Ltd.,Guangzhou 511450,China)
出处
《热加工工艺》
北大核心
2019年第3期43-47,共5页
Hot Working Technology
基金
广州市对外科技合作计划项目(201807010079)
关键词
高碳钢丝
冷拔
组织演变
位错密度
强化机制
high carbon steel wire
cold-drawn
microstructure evolution
dislocation density
strengthening mechanism
