CAJ | 학술논문

等径角挤压(EACP)能够制备具有超细晶粒的致密材料,而且其材料具有优良的机械性能.所以,等径角挤压是目前材料研究的热点之一.在本文中,建立了Eshelby等效夹杂方法的模型,并采用有限元方法对Cu-10%Cr合金的等径角挤压过程进行了模拟.研究了等径角为90°和120°时的两种模型,并对两种模型中材料的等效应变分布,瞬时应变和变形形状变化,以及截面硬度分布进行了分析.研究结果表明,等径角为120°的模型中材料的应变分布比等径角为90°的模型更加均匀;此外,两种模型中材料的硬度分布与应变分布具有较强的联系,等径角为90°的模型中,材料具有较高的硬度值和更加剧烈的硬度变化.两模型硬度最大值差别达到了8.5%.
등경각제압(EACP)능구제비구유초세정립적치밀재료,이차기재료구유우량적궤계성능.소이,등경각제압시목전재료연구적열점지일.재본문중,건립료Eshelby등효협잡방법적모형,병채용유한원방법대Cu-10%Cr합금적등경각제압과정진행료모의.연구료등경각위90°화120°시적량충모형,병대량충모형중재료적등효응변분포,순시응변화변형형상변화,이급절면경도분포진행료분석.연구결과표명,등경각위120°적모형중재료적응변분포비등경각위90°적모형경가균균;차외,량충모형중재료적경도분포여응변분포구유교강적련계,등경각위90°적모형중,재료구유교고적경도치화경가극렬적경도변화.량모형경도최대치차별체도료8.5%.
Equal channel angular pressing (ECAP) has been the subject of intensive study in recent years due to its capability of producing fully dense samples having a ultrafine grain size and having lots of excellent mechanical properties.In this study,the results of the finite element analysis of Cu-10% Cr material during the ECAP process using Eshelby's equivalent inclusion method were presented.And the two cases,die with ψ= 90°and ψ= 120°,were investigated,including the equivalent strain distribution,the transient variation of strain and deformed shapes and the hardness distribution of section in sample after one pass.The distribution of strain is more homogeneous in the die with ψ=120°than in the die with ψ=90°.And the shear strain in ECAP using the high channel angle die is lower than that using the low channel angle.Additionally,the hardness distribution of ECAP with ψ=90°and ψ=120° has strong relationship with the distribution of the strain in two cases.The die with ψ=90° result shows the higher hardness values and more severe variation range of the hardness distribution.The difference between the two maximum hardness values is about 8.5%.