中国有色金属学报
中國有色金屬學報
중국유색금속학보
THE CHINESE JOURNAL OF NONFERROUS METALS
2014年
10期
2482-2489
,共8页
姚彭彭%李萍%薛克敏%李成铭%甘国强
姚彭彭%李萍%薛剋敏%李成銘%甘國彊
요팽팽%리평%설극민%리성명%감국강
TA15钛合金%β相区加热%热变形%相变%织构%组织演化
TA15鈦閤金%β相區加熱%熱變形%相變%織構%組織縯化
TA15태합금%β상구가열%열변형%상변%직구%조직연화
TA15 titanium alloy%β phase region heating institution%hot deformation%phase transition%texture%microstructure evolution
采用OM、XRD和EBSD研究经过β相区加热,在不同工艺参数下热变形水冷淬火后TA15钛合金的显微组织、相变和织构演化规律。结果表明:显微组织主要由被压扁、拉长的原始β晶粒转变的α′马氏体相及清晰β晶界组成,相变点以下温度变形的显微组织中出现沿原始β晶界分布的细小晶界α相晶粒;通过切变方式形成α′马氏体相固溶了Al和V元素,且晶格点阵收缩,衍射峰向高角度方向偏移;α′马氏体与原始β的晶体取向间满足 Burgers 位向关系,显微组织的晶粒取向分布也类似,且随着变形温度和应变速率的提高,材料的晶粒取向性增强;显微组织的晶粒尺寸均在7μm以内,α′晶粒继承母相β晶粒的取向差,在10°、60°和90°附近出现峰值。
採用OM、XRD和EBSD研究經過β相區加熱,在不同工藝參數下熱變形水冷淬火後TA15鈦閤金的顯微組織、相變和織構縯化規律。結果錶明:顯微組織主要由被壓扁、拉長的原始β晶粒轉變的α′馬氏體相及清晰β晶界組成,相變點以下溫度變形的顯微組織中齣現沿原始β晶界分佈的細小晶界α相晶粒;通過切變方式形成α′馬氏體相固溶瞭Al和V元素,且晶格點陣收縮,衍射峰嚮高角度方嚮偏移;α′馬氏體與原始β的晶體取嚮間滿足 Burgers 位嚮關繫,顯微組織的晶粒取嚮分佈也類似,且隨著變形溫度和應變速率的提高,材料的晶粒取嚮性增彊;顯微組織的晶粒呎吋均在7μm以內,α′晶粒繼承母相β晶粒的取嚮差,在10°、60°和90°附近齣現峰值。
채용OM、XRD화EBSD연구경과β상구가열,재불동공예삼수하열변형수랭쉬화후TA15태합금적현미조직、상변화직구연화규률。결과표명:현미조직주요유피압편、랍장적원시β정립전변적α′마씨체상급청석β정계조성,상변점이하온도변형적현미조직중출현연원시β정계분포적세소정계α상정립;통과절변방식형성α′마씨체상고용료Al화V원소,차정격점진수축,연사봉향고각도방향편이;α′마씨체여원시β적정체취향간만족 Burgers 위향관계,현미조직적정립취향분포야유사,차수착변형온도화응변속솔적제고,재료적정립취향성증강;현미조직적정립척촌균재7μm이내,α′정립계승모상β정립적취향차,재10°、60°화90°부근출현봉치。
The microstructure, phase transition and texture evolution of TA15 titanium alloy afterβ phase region heating through hot deformation under different process parameters and water quenching were investigated by OM, XRD and EBSD. The results indicate that the microstructure is mainly composed ofα′ martensite phase transformed from flatted and elongatedβ grains and clearβ grain boundaries. There are some tiny grain boundaryα grains distributed along originalβ grain boundaries through hot deformation below the phase transition point. Al and V elements were dissolved inα′ martensite phase formed by the shear mode, and resulted in crystal lattice contraction and the diffraction peak moving to high-angle. The grain orientation distributions are similar owing to the crystal orientations between martensiteα′ and originalβ complying with the Burgers orientation relationship. The grain orientations of material are enhanced with increasing temperature and strain rate. The average grain size is less than 7μm andα′ grains inherit the misorientation of parentβ grains when the peaks of the number fraction locate at 10°, 60° and 90°.