铸态GH4169高温合金的热变形行为及显微硬度变化  

Thermal deformation behavior and microhardness variation of as-cast GH4169 high temperature alloy

作　　者：赵志伟 李九霄 董安平[2] 王旭彤 王迪 范敏灏 李子怿 ZHAO Zhi-wei;LI Jiu-xiao;DONG An-ping;WANG Xu-tong;WANG Di;FAN Min-hao;LI Zi-yi(School of Materials Science and Engineering,Shanghai University of Engineering Science,Shanghai 201620,China;State Key Laboratory of Metal Matrix Composites,Shanghai Jiao Tong University,Shanghai 200240,China)

机构地区：[1]上海工程技术大学材料科学与工程学院,上海201620 [2]上海交通大学金属基复合材料国家重点实验室,上海200240

出　　处：《塑性工程学报》2024年第10期176-183,共8页Journal of Plasticity Engineering

基　　金：国家自然科学基金资助项目(11202128);国家科技重大专项(J2019-Ⅵ-0004-0117);上海市Ⅲ类高峰学科-材料科学与工程(高能束智能加工与绿色制造)。

摘　　要：采用Gleeble-3500热模拟试验机对铸态GH4169镍基高温合金在不同变形温度(900~1150℃)、不同应变速率(0.001~1s^(-1))及压缩量为50%的条件下进行了热压缩实验。研究了GH4169镍基高温合金在不同变形条件下的真应力-真应变曲线,利用Arrhenius双曲正弦函数结合Z参数,构建了合金热变形的本构关系并探讨了加工硬化行为,最后对其显微硬度进行了测试。结果表明,该合金的流变应力随变形温度升高而降低,但随应变速率升高而升高。所建立的本构方程可以较好地描述该合金热变形过程中的行为。随应变速率下降或变形温度的增加,合金的显微维氏硬度整体表现为下降的趋势。再结晶晶粒细化导致相应的显微维氏硬度增加。The thermal compression tests of as-cast GH4169 nickel-based superalloy were carried out by Gleeble-3500 thermal simulation machine at different deformation temperatures(900-1150℃)and different strain rates(0.001-1 s^(-1)),and the compression amount of 50%.The true stress-true strain curves for GH4169 nickel-based superalloy with different deformation conditions were investigated.Based on the Arrhenius hyperbolic sine function combined with Z parameter,the constitutive relationship of thermal deformation for alloy was constructed and the work-hardening behavior was explored.Finally,the microhardness was tested.The results show that the flow stress of the alloy decreases with the increase of deformation temperature,but increases with the increase of strain rate.The established constitutive equation can provide better descriptions of the behavior of the alloy during thermal deformation.The micro-Vickers hardness of the alloy shows an overall decreasing trend with the decrease of strain rate or the increase of deformation temperature.The refinement of the recrys-tallized grains leads to corresponding increase of micro-Vickers hardness.

关 键 词：GH4169高温合金 热变形 本构方程 加工硬化 显微硬度 

分 类 号：TG379[金属学及工艺—金属压力加工]