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.2.25 Of Cr-1mo-0.25v Steel Ingot Solidification Structure And The Evolution Of The Hot Forging Process

Posted on:2012-11-19Degree:MasterType:Thesis
Country:ChinaCandidate:J H SuFull Text:PDF
GTID:2191330335980110Subject:Materials Processing Engineering
Abstract/Summary:PDF Full Text Request
In this paper, the research object is 2.25Cr-1Mo-0.25V heavy ingot used for hydrogenation reactor. The purpose is to find out the best conditions for a deformation through the study of materials'high temperature mechanical behavior and changes of organizational structure under different thermal deformation.The distribution of the coarse grain structure in the ingot and the analysis of its phase composition were discussed through the anatomy of 240t ingot. Taking the ratio of mixed crystal Dmax/D0 as the expression of tissue characterization parameters,the impact of high-temperature heating on 2.25Cr-1Mo-0.25V steel provides the basis for high-temperature diffusion process parameters by changing the heating temperature, according to degree of evolution and change of mixed crystals.By high temperature homogenization treatment and hot upsetting test, a comprehensive study of the hot deformation conditions on high temperature mechanical behavior, open-grain structure and micro-hardness were investigated.On this basis, for the 2.25Cr-1Mo-0.25V steel mixed crystals, determined the analysis and proposed preventiveThe results show that in view of 2.25Cr-1Mo-0.25V steel ingot used for hydrogenated reactor, thermal deformation of 20% for the deformation, 1250℃for the deformation temperature, 0.1S-1 for the strain rate is the best.At this time Dmax/D0 is 3.1, D0 is 23 ~ 35um. Hardening curves in the hot upsetting process show roughly the characteristics of three stages of elastic deformation - hardening - dynamic recovery.The microstructure consists of granular bainite befor the deformation,and consists of granular Bainite and lath martensite after the deformation. The microstructure consists of ferrite and bainite twins.With the deformation temperature boost and deformation time extension mixed crystals gradually disappear.
Keywords/Search Tags:2.25Cr-1Mo-0.25V steel, coarse-grained, mixed grain, numerical simulation, high-temperature diffusion
PDF Full Text Request
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