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| REFINEMENT OF COARSE WIDMANSTATIEN STRUCTURE IN Ti-6Al-4V CASTING BY CYCLIC HEAT TREATMENT |
| by ZHANG Fan; ZHANG Baochang; HE Ming; WANG Zongzhen(NorthWestern Polytechnical University; Xi'an); XUE Zhixiang; WANG Jinyou (Beijing Research Institute of Aeronautical Materials)(Manuscript received 16 July; 1985; revised manuscript 2 June;1986) |
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Cite this article:
by ZHANG Fan; ZHANG Baochang; HE Ming; WANG Zongzhen(NorthWestern Polytechnical University; Xi'an); XUE Zhixiang; WANG Jinyou (Beijing Research Institute of Aeronautical Materials)(Manuscript received 16 July; 1985; revised manuscript 2 June;1986). REFINEMENT OF COARSE WIDMANSTATIEN STRUCTURE IN Ti-6Al-4V CASTING BY CYCLIC HEAT TREATMENT. Acta Metall Sin, 1987, 23(5): 362-368.
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Abstract The coarse Widmanstatten structure in Ti-6A1-4V alloy casting can be refined effectively by means of the following heat treatment: quenching from β phase region and then cyclic heating in (α+β) region. The mechanical properties of this casting will also be improved by this treatment. The results show that queching from β phase region can remove the α grain boundaries and thus a whole martensite structure will be obtained. Consequently, the heredity of Widmanstatten structure was cut off. During the subsequent cyclic heating, the martensite decomposes and β phase precipitates on the dislocations and along the substructural boundaries of α′ Plates, so that they are separated into small segments. Accompanying with the increasing number of cycles or time of annealing, the α segments grow up and form acicular α with random orientation. Finally, fine basketwave structure emerges. The breaking of α plates can be well explained by dissolution-separation process caused by cyclic heating.
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Received: 18 May 1987
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1 张帆,张宝昌,何明,薛志庠,王金友.航空材料(专刊),198s;5(2) :1
2 张宝昌,王宗贞,何明,肖敏,阎卫东,杨立哲.稀有金属,1985;9(5) :1E |
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