挤压态HNi55-7-4-2镍黄铜合金的热变形行为和加工图  

Hot deformation behavior and processing map of extruded HNi55-7-4-2 nickel-brass alloy

作　　者：梁强 贾艳艳 李永亮[1,2] 王敬 徐永航 LIANG Qiang;JIA Yan-yan;LI Yong-liang;WANG Jing;XU Yong-hang(College of Mechanical Engineering,Chongqing Technology and Business University,Chongqing 400067,China;Chongqing Key Laboratory of Manufacturing Equipment Mechanism Design and Control,Chongqing Technology and Business University,Chongqing 400067,China)

机构地区：[1]重庆工商大学机械工程学院,重庆400067 [2]重庆工商大学制造装备机构设计与控制重庆市重点实验室,重庆400067

出　　处：《材料热处理学报》2023年第2期171-178,188,共9页Transactions of Materials and Heat Treatment

基　　金：重庆市高校创新研究群体(CXQT21024);2021年度校内资助项目计划(2152026)。

摘　　要：首先,以挤压态HNi55-7-4-2镍黄铜合金为对象,应用热模拟机Gleeble-3500对其进行等温热压缩实验,研究该合金在600~800℃和0.01~10 s^(-1)条件下的热变形行为。其次,基于动态材料模型和极性交互模型,分别建立HNi55-7-4-2镍黄铜合金的Prasad、Murty和PRM加工图,并结合不同变形条件下的微观组织演变,对比3种加工图的预测效果。结果表明:Murty加工图预测效果最差,而Prasad加工图和PRM加工图预测效果较好。HNi55-7-4-2镍黄铜合金的最优热变形加工参数范围为:变形温度为600~725℃,应变速率为0.01~0.07 s^(-1)和变形温度为740~800℃,应变速率为0.05~1 s^(-1)。失稳区的变形机制为局部塑性流动和混晶组织,安全区的变形机制为动态再结晶。Firstly,the hot deformation behavior of extruded HNi55-7-4-2 nickel-brass alloy under the conditions of deformation temperature of 600-800℃ and strain rate of 0.01-10 s-1was studied by isothermal compression experiment with Gleeble-3500 thermal simulator.Secondly,based on the dynamic material model and polar reciprocity model,Prasad,Murty and PRM processing maps of the HNi55-7-4-2 nickel-brass alloy were established respectively,and the prediction effects of the three processing maps were compared in combination with the microstructure evolution under different deformation conditions.The results show that the Murty processing map has the worst prediction effect,while Prasad processing map and PRM processing map have better prediction effect.The range of the optimal hot deformation processing parameters of the HNi55-7-4-2 nickel-brass alloy is as follows:the deformation temperature of 600-725℃ and the strain rate of 0.01-0.07 s^(-1),and the deformation temperature of 740-800℃ and the strain rate of 0.05-1 s^(-1).The deformation mechanism of the instability zone is local plastic deformation and mixed-grain microstructure,while that of the stable zone is dynamic recrystallization.

关 键 词：挤压态HNi55-7-4-2镍黄铜合金 热变形行为 加工图 极性交互模型 

分 类 号：TG146.1[一般工业技术—材料科学与工程]