固溶处理对Ni-Co基高温合金反常动态应变时效的影响
收稿日期: 2012-04-18
修回日期: 2012-07-09
网络出版日期: 2012-10-11
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
EFFECT OF SOLUTION TREATMENT ON THE INVERSE DYNAMIC STRAIN AGING OF A Ni–Co BASE SUPERALLOY
Received date: 2012-04-18
Revised date: 2012-07-09
Online published: 2012-10-11
Supported by
Supported by National Basic Research Program of China (No.2010CB631206), National Natural Science Foundation of China (Nos.51171179, 51128101 and 51271174) and "Hundreds of Talents Projects"of Chinese Academy of Sciences
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
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 . DOI: 10.3724/SP.J.1037.2012.00212
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.
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