稀有金属材料与工程
稀有金屬材料與工程
희유금속재료여공정
RARE METAL MATERIALS AND ENGINEERNG
2012年
4期
570-574
,共5页
杨慧敏%苏彦庆%骆良顺%陈辉%郭景杰%傅恒志
楊慧敏%囌彥慶%駱良順%陳輝%郭景傑%傅恆誌
양혜민%소언경%락량순%진휘%곽경걸%부항지
TiAl基合金%合金化%细化
TiAl基閤金%閤金化%細化
TiAl기합금%합금화%세화
TiAl-based alloy%alloying%refinement
对利用非自耗电弧熔炼设备得到的Ti-46Al,Ti-46Al-0.3B,Ti-46Al-0.5B,Ti-46Al-2Fe,Ti-46Al-2Fe-0.3B和Ti-46Al-2Fe-0.5B合金的凝固组织进行了研究.结果表明,铸态TiAl基合金的宏观组织为典型的柱状晶组织,而且平均柱状晶直径随着Fe和B元素的加入显著减小.其中,Ti-46Al-2Fe-0.5B合金的柱状晶直径最小.B元素可以显著地细化TiAl基合金的柱状晶组织和枝晶组织,这主要是由于B元素的添加可以显著增加固液界面前沿的成分过冷度从而细化TiAl基合金的凝固组织.而且,Fe元素的添加还可以显著地提高B元素对TiAl基合金的柱状晶组织的细化效果.
對利用非自耗電弧鎔煉設備得到的Ti-46Al,Ti-46Al-0.3B,Ti-46Al-0.5B,Ti-46Al-2Fe,Ti-46Al-2Fe-0.3B和Ti-46Al-2Fe-0.5B閤金的凝固組織進行瞭研究.結果錶明,鑄態TiAl基閤金的宏觀組織為典型的柱狀晶組織,而且平均柱狀晶直徑隨著Fe和B元素的加入顯著減小.其中,Ti-46Al-2Fe-0.5B閤金的柱狀晶直徑最小.B元素可以顯著地細化TiAl基閤金的柱狀晶組織和枝晶組織,這主要是由于B元素的添加可以顯著增加固液界麵前沿的成分過冷度從而細化TiAl基閤金的凝固組織.而且,Fe元素的添加還可以顯著地提高B元素對TiAl基閤金的柱狀晶組織的細化效果.
대이용비자모전호용련설비득도적Ti-46Al,Ti-46Al-0.3B,Ti-46Al-0.5B,Ti-46Al-2Fe,Ti-46Al-2Fe-0.3B화Ti-46Al-2Fe-0.5B합금적응고조직진행료연구.결과표명,주태TiAl기합금적굉관조직위전형적주상정조직,이차평균주상정직경수착Fe화B원소적가입현저감소.기중,Ti-46Al-2Fe-0.5B합금적주상정직경최소.B원소가이현저지세화TiAl기합금적주상정조직화지정조직,저주요시유우B원소적첨가가이현저증가고액계면전연적성분과랭도종이세화TiAl기합금적응고조직.이차,Fe원소적첨가환가이현저지제고B원소대TiAl기합금적주상정조직적세화효과.
The microstructures of Ti-46Al, Ti-46Al-0.3B, Ti-46Al-0.5B, Ti-46Al-2Fe, Ti-46Al-2Fe-0.3B, and Ti-46Al-2Fe-0.5B alloys solidified on water-cooled copper crucible were investigated.It is found that the as-cast alloys possess a typical columnar structure,and the mean diameters of the columnar grains decrease significantly as the addition of Fe or B.The mean columnar diameter in Ti-46Al-2Fe-0.5B is found to be the smallest among these alloys.B addition can increase the constitutional supercooling in front of the solid-liquid interface,which refines the columnar structure and the dendritic structure.Moreover,Fe addition can enhance the refining effect of boron on the columnar structure of TiAl-based alloys.
