铸态Cu-1.0Ni-0.2P合金高温热变形行为研究  

Study on high temperature hot deformation behavior of cast Cu⁃1.0Ni⁃0.2P alloy

作　　者：龚留奎 张延松[1] 宋士鑫 黄滢秋 刘晓彬[1] 阮金琦 黄伟[1] GONG Liukui;ZHANG Yansong;SONG Shixin;HUANG Yingqiu;LIU Xiaobin;RUAN Jinqi;HUANG Wei(Ningbo Branch of Chinese Academy of Ordnance Science,Ningbo 315103,China;Ningbo Surface Engineering Research Institute Co.Ltd.,Ningbo 315103,China)

机构地区：[1]中国兵器科学研究院宁波分院,浙江宁波315103 [2]宁波表面工程研究院有限公司,浙江宁波315103

出　　处：《兵器材料科学与工程》2023年第6期70-77,共8页Ordnance Material Science and Engineering

基　　金：中央引导地方科技发展专项资(YDZX2022143);宁波市有色合金新材料创新联合体(2021H003);宁波市科技创新2025重大专项(2022Z053)。

摘　　要：研究了铸态Cu-1.0Ni-0.2P合金在750、800、850、900、950℃,0.1、1.0、10.0 s-1应变率下的高温变形行为,获得其热压缩过程的流变应力-应变曲线,构建基于Arrhenius方程的本构模型和热加工图,阐明了变形温度和应变率对铸态Cu-1.0Ni-0.2P合金显微组织的影响规律。结果表明:铸态Cu-1.0Ni-0.2P合金对温度、应变率较为敏感,其流变应力总体上随变形温度的升高而降低、随应变率的增大而增大,在真应变ε=0.2和ε=0.4对应的热变形激活能分别为359.102 k J/mol和498.313 k J/mol。同一温度下,当应变率为1、10 s-1时,长条变形晶粒更少或再结晶晶粒较小;随变形温度的升高,合金长条变形晶粒发生再结晶和晶粒长大,当热加工温度为900~950℃时,再结晶组织较为均匀。结合显微组织论证分析得到铸态Cu-1.0Ni-0.2P合金的最佳热加工工艺参数为900~950℃、1 s-1和900℃、10 s-1,为铸态Cu-1.0Ni-0.2P合金的热加工工艺提供理论指导。The high temperature deformation behaviors of cast Cu⁃1.0Ni⁃0.2P alloy at 750℃,800℃,850℃,900℃,950℃,0.1 s-1,1.0 s-1,10.0 s-1 were studied,the flow stress⁃strain curve of as cast Cu⁃1.0Ni⁃0.2P alloy during hot compression was obtained,and the constitutive model and hot working diagram based on Arrhenius equation were constructed,and the influence of deformation temperature and strain rate on the microstructure of as cast Cu⁃1.0Ni⁃0.2P alloy was elucidated.The results show that the cast Cu⁃1.0Ni⁃0.2P alloy is sensitive to temperature and strain rate,and its flow stress decreases with the increase of deformation temperature and increases with the increase of strain rate,and the thermal deformation activation energies corresponding to the true strainε=0.2 andε=0.4 are 359.102 kJ/mol and 498.313 kJ/mol,respectively.At the same temperature,when the strain rate is 1 s-1 or 10 s-1,there will be fewer elongated deformation grains or finer recrystallized grains.With the increase of deformation temperature,the deformed grains of the alloy strip gradually become recrystallized grains and grow up.When the hot working temperature is 900⁃950℃,the recrystallized structure is more uniform.According to the microstructure analysis,the best hot working process parameters of as cast Cu⁃1.0Ni⁃0.2P alloy are 900⁃950℃,1 s-1 and 900℃,10 s-1,which provides a theoretical guidance for the thermal processing of cast Cu⁃1.0Ni⁃0.2P alloy.

关 键 词：Cu-1.0Ni-0.2P 热模拟 本构方程 热加工图 

分 类 号：TG146.1[一般工业技术—材料科学与工程]