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作 者:宋子威 于燕[1] 刘臻[2] 童彤 SONG Ziwei;YU Yan;LIU Zhen;TONG Tong(Key Laboratory of Advanced Structural Materials Sponsored by Ministry of Education and Province,Changchun University of Technology,Changchun 130012,China;Jilin Institute of Science and Technology Information,Changchun 130021,China)
机构地区:[1]长春工业大学先进结构材料省部共建教育部重点实验室,吉林长春130012 [2]吉林省科学技术信息研究所,吉林长春130021
出 处:《热加工工艺》2022年第24期152-155,共4页Hot Working Technology
基 金:吉林省科技厅计划项目(20150204037SF)。
摘 要:采用真空熔炼法制备了元素质量比为w(Co)∶w(Cr)∶w(Mo)∶w(W)∶w(Si)=63.9∶24.7∶5.0∶5.4∶1的合金棒材。对经不同固溶/时效热处理的合金试样进行组织观察与力学性能分析,并对Mo、W元素强化钴铬合金的机理进行了分析。结果表明,真空熔炼CoCrMoW合金的主要物相为γ-Co,有少量ε-Co,在晶间识别出富Cr的σ(CrCo)相、Co(7)Mo_(6)相及Co_(3)W相。随固溶温度的提高,晶间σ相中的Cr原子溶入γ-Co基体中,晶粒由柱状晶转变为粗大树枝晶。时效处理对合金的强化取决于ε相生成的速率及片层结构的密度,高温加速ε相的生成,850℃×2 h条件下生成速率最快,其力学性能达到硬度802 HV、强度839.46 MPa,断口均为解理断口。热处理前后,Co(7)Mo_(6)及Co_(3)W相变化不大,钉扎于晶间,限制了晶界移位及ε相片层间的滑移,使CoCrMoW合金的强度远超同类的CoCr合金的强度。The alloy bar with a mass ratio of w(Co)∶w(Cr)∶w(Mo)∶w(W)∶w(Si)=63.9∶24.7∶5.0∶5.4∶1 was prepared by vacuum melting.The microstructure and mechanical properties of the alloy samples after different solid solution/aging heat treatment were observed and analyzed,and the mechanism of strengthening cobalt-chromium alloy by Mo,W element was analyzed.The results show that,the main phase of vacuum melting CoCrMoW alloy isγ-Co and a small amount ofε-Co.Theσ(CrCo)phase,Co(7)Mo_(6) phase and Co_(3)W phase rich in Cr are identified between crystals.With the increase of solid solution temperature,the Cr atom in the intergranular phase is dissolved into theγ-Co matrix,and the grain changes from columnar crystal to coarse dendrite.The strengthening of the aging treatment on the alloy depends on the rate of phase formation and the density of lamellar structure,and accelerates the formation ofεphase at high temperature.The formation rate is the fastest under the condition of 850℃for 2 h,and the mechanical properties reach the hardness of 802 HV,the strength is 839.46 MPa,and the fracture is the cleavage fracture.Before and after heat treatment,the phase of Co(7)Mo_(6) and Co_(3)W changes little,which limit the grain boundary shift and the slip betweenεphoto layers,so that the strength of CoCrMoW alloy is much higher than those of the same kinds of CoCr alloy.
分 类 号:TG166.7[金属学及工艺—热处理]
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