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
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.
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 . DOI: 10.3724/SP.J.1037.2012.00212
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