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NiPt15合金热变形行为及热加工图研究
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1.贵研铂业股份有限公司稀贵金属综合利用新技术国家重点实验室 云南 昆明;2.昆明贵金属研究所

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国家重点研发计划项目 (2017YFB0305503);云南省创新团队项目 (2019HC024);云南省第十八批技术创新人才 (2019HB107);昆明市稀贵金属溅射靶材科技创新团队 (第11批);云南省科技厅科研院所技术开发研究专项 (2018DC004)


Hot Deformation Behavior and Hot Processing Maps of NiPt15 Alloys
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1.State Key Laboratory of New Technologies for Comprehensive Utilization of Platinum Metals,Kunming;2.Kunming Institute of Precious Metals

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    摘要:

    通过Gleeble-3500 热模拟实验机在950~1150℃,应变速率为0.01~3s-1 条件下的近等温热模拟压缩实验,建立了NiPt 15合金的流变应力-应变曲线及其热加工图。分析了NiPt15合金不同变形阶段的功率耗散情况;阐明了NiPt15合金的损伤失稳机制;基于Prasad 动态材料模型获得了不同应变速率、温度条件下的能量耗散率和失稳系数;研究了应变量、温度和应变速率对于能量耗散率和失稳系数的影响。结果表明:(1)变形温度是影响曲线变化趋势及动态再结晶的主要因素,且变形温度越高,应变速率越低,动态再结晶越充分;(2)加工失稳机制主要包括局部塑性变形、剪切变形带以及开裂,随真应变的增大先发生局部塑性变形,而后由剪切变形带取代,并最终向开裂演变;(3)NiPt15合金较为优异的加工实验条件主要集中在非失稳区,即变形参数1000~1100℃,0.03~0.1s-1以及1100~1130℃,0.01~0.03s-1范围内,并通过显微组织分析对热加工图进行了验证。

    Abstract:

    Isothermal compression tests of NiPt15 alloys at temperatures ranging from 950 to 1150℃ and strain rates from 0.01 to 3s-1 were performed on Gleeble-3500 thermo-simulation machine. Based on stress-strain relationship curve of NiPt15 and hot processing maps during the hot deformation process were established. The power dissipation situation of NiPt15 alloy at different stage were analyzed. The damage instability mechanism of NiPt15 alloy was elucidated. According to the dynamic material model presented by Prasad, hot processing maps for hot working condition were established based on the effect of power dissipation and instability coefficient associated with various kinds of temperatures and stain rates. The results showed that the deformation temperature is the main factor affection of the curve variation trend and dynamic recrystallization. Moreover, the higher of deformation temperature and the lower of deformation rate, the dynamic recrystallization will be the more sufficient. Subsequently, the instability mechanism of NiPt15 alloy in thermal processing mainly included local plastic deformation, shear deformation zone and cracking. With the increase of true strain, local plastic deformation occured firstly, then shear deformation zone replaced it, and finally it evolved into cracking. The excellent safe processing zone for NiPt15 alloy were mainly concentrated in the non-instability zone . That was to say, the deformation parameters were within the range of 1000~1100℃, 0.03~0.1s-1 and 1100~1130℃, 0.01~0.03s-1. Moreover, the thermal processing map was verified by microstructure analysis.

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谭志龙,尹畅畅,闻 明,郭俊梅,陈家林,王传军,宋志昊,许彦亭. NiPt15合金热变形行为及热加工图研究[J].稀有金属材料与工程,2021,50(11):4149~4156.[Tan Zhilong, Ying Changchang, Wen Ming, Guo Junmei, Chen Jialin, Wang Chuanjun, Song Zhihao, Xu Yanting. Hot Deformation Behavior and Hot Processing Maps of NiPt15 Alloys[J]. Rare Metal Materials and Engineering,2021,50(11):4149~4156.]
DOI:10.12442/j. issn.1002-185X.20200933

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历史
  • 收稿日期:2020-12-03
  • 最后修改日期:2021-01-28
  • 录用日期:2021-03-08
  • 在线发布日期: 2021-11-30
  • 出版日期: 2021-11-24