均匀化工业电解镍高温热变形行为的研究  

Study on High-Temperature Deformation Behavior of Homogenized Industrial Electrolytic Nickel

作　　者：张涵[1,2] 桑晨[1,2,3] 苗承鹏 李渊 刘晓斌 禹泽海 董生茂 乔及森 徐仰涛[1,2,3] 夏天东[1,2] Zhang Han;Sang Chen;Miao Chengpeng;Li Yuan;Liu Xiaobin;Yu Zehai;Dong Shengmao;Qiao Jisen;Xu Yangtao;Xia Tiandong(School of Materials Science and Engineering,Lanzhou University of Technology,Lanzhou 730050,China;State Key Laboratory of Advanced Processing and Recycling of Nonferrous Metals,Lanzhou University of Technology,Lanzhou 730050,China;Baiyin Novel Materials Research Institute,Lanzhou University of Technology,Baiyin 730900,China;Jinchuan Group Nickel Alloy Co.,Ltd,Jinchang 737100,China)

机构地区：[1]兰州理工大学材料科学与工程学院,甘肃兰州730050 [2]兰州理工大学省部共建有色金属先进加工与再利用国家重点实验室,甘肃兰州730050 [3]兰州理工大学白银新材料研究院,甘肃白银730900 [4]金川集团镍合金有限公司,甘肃金昌737100

出　　处：《稀有金属材料与工程》2024年第9期2661-2668,共8页Rare Metal Materials and Engineering

基　　金：甘肃省科技重大专项(22ZD6GA008);甘肃省科技计划项目重点研发计划(21YF5GD186);甘肃省高等学校产业支撑计划(2022CYZC-19);兰州理工大学省部共建有色金属先进加工与再利用国家重点实验室开放基金(SKLAB02019012)。

摘　　要：采用Gleeble-3500热模拟试验机对均匀化后的工业电解镍进行了热压缩试验,在变形量60%的条件下,研究了变形温度为900、1000、1100、1200℃,应变速率为0.01、0.1、1、10 s^(-1)时的热变形行为。采用电子背散射衍射(EBSD)研究了电解镍热变形过程的微观组织演变;根据压缩数据获得真应力-真应变曲线,分析了变形温度和应变速率对电解镍力学性能的影响,并得到流变应力本构方程,基于动态材料模型及Prassd失稳准则建立了热加工图。结果表明:电解镍对变形温度和应变速率表现出较强的敏感性,随变形温度的升高和应变速率的降低,流变应力逐渐减小;随应变的增加,流变应力达峰值下降至某一值后趋于平稳,呈现出流变软化特征;电解镍在热变形过程中发生了不连续动态再结晶,随着变形温度升高小角度晶界向大角度晶界转化,低应变速率下动态再结晶过程发生得更加充分。根据热加工图,获得电解镍较佳的热加工工艺范围为:变形温度980~1040℃,应变速率3.16~10 s^(-1);变形温度为1100℃,应变速率为1~4 s^(-1)。Hot compression experiments were carried out on homogenized industrial electrolytic nickel by a Gleeble-3500 thermal simulation tester,and the high temperature deformation behavior was investigated at the temperature of 900,1000,1100,and 1200℃ under the strain rate of 0.01,0.1,1,and 10 s^(-1) and the deformation of 60%.The microstructure evolution of electrolytic nickel during hot deformation was investigated by EBSD.The true stress-true strain curves were obtained based on the compression data,the effects of deformation temperature and strain rate on the mechanical properties of electrolytic nickel were analyzed,the rheological stress eigenstructure equations were obtained,and the thermal processing diagrams were established based on the dynamic material model and the Prassd instability criterion.The results show that electrolytic nickel exhibits strong sensitivity to deformation temperature and strain rate,and the rheological stress decreases gradually with the increase of deformation temperature and the decrease of strain rate.With the increase of strain,the rheological stress reaches a peak,decreases to a certain value,and then tends to stabilize,showing the characteristics of rheological softening.Discontinuous dynamic recrystallization of electrolytic nickel occurs during hot deformation,and the dynamic recrystallization process occurs more completely at low strain rates as the deformation temperature increases with the transformation of small-angle grain boundaries to large-angle grain boundaries.According to the thermal processing diagram,the better thermal processing process range of electrolytic nickel is obtained as follows:the range of deformation temperature is 980-1040℃ and the change of strain rate is from 3.16 s^(-1) to 10 s^(-1);the deformation temperature is 1100℃ and the strain rate is from 1 s^(-1) to 4 s^(-1).

关 键 词：电解镍 热变形行为 本构方程 热加工图 

分 类 号：TG146.15[一般工业技术—材料科学与工程]