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金属学报  2012, Vol. 48 Issue (10): 1223-1228    DOI: 10.3724/SP.J.1037.2012.00212
  论文 本期目录 | 过刊浏览 |
固溶处理对Ni-Co基高温合金反常动态应变时效的影响
田成刚1,崔传勇1,谷月峰2,孙晓峰1
1. 中国科学院金属研究所, 沈阳 110016
2. 日本国立材料研究所, 筑波 305--0047
EFFECT OF SOLUTION TREATMENT ON THE INVERSE DYNAMIC STRAIN AGING OF A Ni–Co BASE SUPERALLOY
TIAN Chenggang 1, CUI Chuanyong 1, GU Yuefeng 2, SUN Xiaofeng 1
1. Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016
2. National Institute for Materials Science, Tsukuba 305–0047, Japan
引用本文:

田成刚 崔传勇 谷月峰 孙晓峰. 固溶处理对Ni-Co基高温合金反常动态应变时效的影响[J]. 金属学报, 2012, 48(10): 1223-1228.
TIAN Chenggang CUI Chuanyong GU Yuefeng SUN Xiaofeng. EFFECT OF SOLUTION TREATMENT ON THE INVERSE DYNAMIC STRAIN AGING OF A Ni–Co BASE SUPERALLOY[J]. Acta Metall Sin, 2012, 48(10): 1223-1228.

全文: PDF(1369 KB)  
摘要: 

研究了亚固溶和过固溶处理对Ni-Co基高温合金在400和450 ℃和不同应变速率下拉伸时的锯齿状塑性失稳现象的影响. 实验结果表明, 过固溶合金的晶粒尺寸和二次γ'相间距大于亚固溶合金. 2种固溶处理后的合金都表现为反常动态应变时效, 其锯齿状流变现象都是由置换固溶原子和可动位错的相互作用引起的. 2种固溶处理后锯齿状流变的临界应变量的差别与合金内二次γ'相的间距和塑性变形时合金内位错密度有关; 其应力差值的区别与塑性变形时合金内位错密度及由晶界控制的扩散有关.

关键词 Ni-Co基高温合金 动态应变时效(DSA) 激活能 置换固溶原子 临界应变量 应力差值    
Abstract

Serrated flow in a Ni–Co base superalloy was investigated after subsolvus and supersolvus solution treatments at the temperatures of 400 and 450  ℃ by tensile loading at different strain rates. The results suggested that the sizes of the grain and secondary  γ′ phase of the alloy after supersolvus solution were larger than that of the alloy after subsolvus solution. The serrated flow exhibited inverse DSA behavior after two solution treatments, which was caused by the interaction between substitutional solutes and mobile dislocations. The variation of critical strain of serrated flow after two solution treatments may be related to different spacing between secondary  γ′ and different densities of mobile dislocations during plastic deformation. The different densities of mobile dislocations and the diffusion controlled by grain boundary were responsible for the variation of stress drop of serrated flow after two solution treatments.

Key wordsNi-Co base superalloy    dynamic strain ageing (DSA)    activation energy    substitutional solute atom    critical strain    stress drop
收稿日期: 2012-04-18     
基金资助:

国家重点基础研究发展计划项目2010CB631206, 国家自然科学基金项目51171179, 51128101和51271174, 以及中国科学院“百人计划”项目资助

作者简介: 田成刚, 男, 1987年生, 博士生

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