摘要
ThehotdeformationbehaviorofTC18alloyatstrainratesrangingfrom1910-4to1910-2s-1andtemperaturesrangingfrom25to800°CwasstudiedusingaWDW-300electronicuniversaltestingmachine.Therelationshipsbetweentruestressandtruestrainshowthatflowstressdecreaseswiththeincreaseoftemperatureandincreasesasstrainrateincreases.Theeffectofstrainrateontheflowstressbecomespronouncedathighertemperatures.Atroomtemperature,theriverpatterncharacteristicofbrittlefractureandthedimplepatterntypicalofductilefracturearefoundtoexistindifferentregionsoffracturesurfacesofthesamples.AnimprovedconstitutiverelationshipisproposedtoaccuratelydescribetheflowstressofTC18byconsideringtheeffectofstrain.Andamicroscopicmodelisalsodeducedwhichcanlinkthephysicalmechanismstothemacroscopicexperimentalresults.Agoodagreementisobtainedbetweenthepredictionsofthemicroscopicmodelandtheresultsofthemacroscopicexperiment.
出版日期
2014年04月14日（中国期刊网平台首次上网日期，不代表论文的发表时间）
