夏玉峰,滕海灏,程千

• 1:重庆大学材料科学与工程学院

摘要(Abstract)：

选用了一种镍基合金焊材(CHN327)用于新型"拳头式"锻模表面层的电弧熔丝增材制造,对模具镍基表层的显微组织、力学性能及该种镍基合金的中温流变行为进行了研究。对试样进行了10次以2℃/s的加热速度加热至700℃后淬火的处理,模拟了模具服役中的温度循环,并对加热和水淬前后的显微组织变化进行了表征。采用WDW-100万能试验机在温度600～700℃和应变速率0.001～0.1 s~(-1)范围内对镍基表层试样进行了单向中温拉伸试验,研究变形温度和应变速率对CHN327合金流变应力的影响,建立了镍基合金CHN327流变应力与变形条件之间关系的数学模型。结果表明:经加热-淬火温度循坏后,"拳头式"锻模镍基表面层γ″-Ni_3Nb相含量增加,镍基表面层与铁基层的结合强度提高;镍基合金CHN327满足正应变速率敏感材料特性,基于Arrhenius模型拟合出的模型参数能较好地预测合金中温变形中的流动应力。

关键词(KeyWords)： 镍基合金CHN327;电弧熔丝增材;中温拉伸试验;流变应力模型

Abstract:

Keywords:

基金项目(Foundation): 国家重点研发计划(2018YFB1106502);; 国家自然基金面上项目(51775068);; 重庆市技术创新与应用示范专项产业类重点研发项目(cstc2018jszx-cyzdX0121);; 国家工业强基工程(TC180A3Y1/18);; 重庆市技术创新与应用发展(重点项目(目标导向类))(cstc2019jscx-mbdx0080)

作者(Author): 夏玉峰,滕海灏,程千

DOI: 10.13289/j.issn.1009-6264.2020-0055

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