李增德,李卿,解浩峰,彭丽军,杨振,张文婧,黄树晖,张习敏,黄国杰.V-5Cr-5Ti合金的拉伸性能及其强化机理[J].稀有金属材料与工程,2022,51(8):2745~2753.[Li Zengde,Li Qing,Xie Haofeng,Peng LIjun,Yang Zhen,Zhang Wenjing,Huang Shuhui,Zhang Ximin,Huang Guojie.Effect of Microstructure and Precipitate on Tensile Properties of V-5Cr-5Ti Alloy[J].Rare Metal Materials and Engineering,2022,51(8):2745~2753.]
V-5Cr-5Ti合金的拉伸性能及其强化机理
投稿时间:2021-06-26  修订日期:2021-10-10
中文关键词:  V-5Cr-5Ti合金  变形加工  析出相  拉伸性能  断裂机制  析出相强化
基金项目:NSFC(U1532262)
中文摘要:
      对真空熔炼V-5Cr-5Ti合金开展了均匀化退火、热锻开坯、冷轧变形和热处理实验,利用万能试验机、扫描电镜(SEM)和透射电镜(TEM)研究了V-5Cr-5Ti合金中析出相对力学性能影响,估算了V-5Cr-5Ti合金中析出相强化的效果。结果表明:铸态V-5Cr-5Ti合金存在以片层状析出相为特征的树枝状析出相,合金均匀化退火后析出相由片层状转化为针状,由树枝状转化成团聚状。析出相在变形过程中破碎成短条状或球状颗粒。铸态合金的抗拉强度、屈服强度和延伸率的平均值分别为505.0 MPa、415.0 MPa和8.2%,断裂机制为脆性的解理断裂。均匀化热处理后断裂机制转变为沿晶断裂和准解离断裂共存的混合型断裂。80%冷变形+热处理后合金的抗拉强度、屈服强度和延伸率的平均值分别为487.3 MPa、382.7 MPa和26.2%,由于晶粒及析出相形态的变化,合金塑性得到大幅改善。锻造和冷轧后合金断裂机制为韧性的微孔型断裂。析出相以Orowan强化机制增强V-5Cr-5Ti合金,以80%冷轧1000 ℃/1 h退火状态合金为例,由析出相强化获得的屈服强度增量约为50.1 MPa。
Effect of Microstructure and Precipitate on Tensile Properties of V-5Cr-5Ti Alloy
英文关键词:V-5Cr-5Ti alloy  microstructure  precipitate  tensile property  fracture mechanism  precipitation strengthening
英文摘要:
      After homogenization, forging, cold rolling, and recrystallization of V-5Cr-5Ti alloy, universal testing machine, scanning electron microscopy, and transmission electron microscopy were used to study the effect of precipitates on the mechanical properties of the alloy and to estimate the strengthening effect. Results show that as-cast V-5Cr-5Ti alloy has a dendritic structure characterized by lamellar phase. After homogenization, the precipitates are transformed from a lamellar to a needle-like dendritic structure. The precipitates are broken into a short-bar or spherical phase during forging and cold rolling. The average tensile strength, yield strength, and elongation of the as-cast alloy are 505.0 MPa, 415.0 MPa, and 8.2%, respectively, with the brittle cleavage fracture as the dominant fracture mechanism. The fracture mechanism is transformed into a mixed fracturing mode of intergranular and quasi-dissociative fractures after homogenization. After 80% cold rolling and 1000 °C/1 h annealing, the average tensile strength, yield strength, and elongation of the alloy are 487.3 MPa, 382.7 MPa, and 26.2%. The alloy plasticity is greatly improved due to the refinement of the grain and precipitates. The fracture mechanism of the alloy after cold rolling and annealing is microporosity fracture. The precipitates enhance V-5Cr-5Ti alloy by Orowan strengthening mechanism. Taking the alloy after 80% cold rolling and annealing at 1000 °C/1 h as an example, the yield strength increment obtained by precipitate strengthening is about 50.1 MPa.
作者单位E-mail
李增德 有研科技集团有限公司有色金属材料制备加工国家重点实验室 sabai110@163.com 
李卿 有研科技集团有限公司有色金属材料制备加工国家重点实验室  
解浩峰 有研科技集团有限公司有色金属材料制备加工国家重点实验室  
彭丽军 有研科技集团有限公司有色金属材料制备加工国家重点实验室  
杨振 有研科技集团有限公司有色金属材料制备加工国家重点实验室  
张文婧 有研科技集团有限公司有色金属材料制备加工国家重点实验室  
黄树晖 有研科技集团有限公司有色金属材料制备加工国家重点实验室  
张习敏 有研科技集团有限公司有色金属材料制备加工国家重点实验室  
黄国杰 有研科技集团有限公司有色金属材料制备加工国家重点实验室  
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