Effect of α + β region sintering on the mechanical properties of injection molded Ti-6Al-4V compacts
Injection molded Ti-6Al-4V compacts have normally a coarse lamellar microstructure, because it is sintered above the β transus temperature and it is cooled slowly in furnace. However, static mechanical properties such as tensile strength and ductility are equivalent to those of wrought materials, bu...
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The Japan Society of Mechanical Engineers
2018
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oai:doaj.org-article:b330101693fa4a0cac162eddc8dc19cb2021-11-26T07:21:52ZEffect of α + β region sintering on the mechanical properties of injection molded Ti-6Al-4V compacts2187-974510.1299/mej.17-00686https://doaj.org/article/b330101693fa4a0cac162eddc8dc19cb2018-07-01T00:00:00Zhttps://www.jstage.jst.go.jp/article/mej/5/4/5_17-00686/_pdf/-char/enhttps://doaj.org/toc/2187-9745Injection molded Ti-6Al-4V compacts have normally a coarse lamellar microstructure, because it is sintered above the β transus temperature and it is cooled slowly in furnace. However, static mechanical properties such as tensile strength and ductility are equivalent to those of wrought materials, but they have the disadvantage that the fatigue strength is significantly lower than wrought materials. Therefore, improvement of fatigue strength is needed for injection molded Ti alloy compacts. In this study, injection molded Ti-6Al-4V compacts having equiaxed microstructure were prepared by sintering at α + β region temperature which is very lower than normal sintering temperature. When sintering is carried out in α + β region, sinterability is remarkably poor. Therefore, long-time sintering is required. Since the grain growth of the prior β grains was suppressed by the pinning effect of α grains and pores, it was possible to obtain the significantly fine grains as compared with the β region sintered compacts. The α + β region sintered compacts showed high strength, high elongation and also high fatigue strength. Furthermore, by applying HIP treatment, the mechanical properties were improved to satisfy the standard value of wrought Ti-6Al-4V material.Kentaro KUDOKazunari SHINAGAWAHideshi MIURAThe Japan Society of Mechanical Engineersarticlemetal injection moldingti-6al-4vfatigue strengthgrain refinementα + β region sinteringMechanical engineering and machineryTJ1-1570ENMechanical Engineering Journal, Vol 5, Iss 4, Pp 17-00686-17-00686 (2018) |
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DOAJ |
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DOAJ |
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EN |
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metal injection molding ti-6al-4v fatigue strength grain refinement α + β region sintering Mechanical engineering and machinery TJ1-1570 |
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metal injection molding ti-6al-4v fatigue strength grain refinement α + β region sintering Mechanical engineering and machinery TJ1-1570 Kentaro KUDO Kazunari SHINAGAWA Hideshi MIURA Effect of α + β region sintering on the mechanical properties of injection molded Ti-6Al-4V compacts |
| description |
Injection molded Ti-6Al-4V compacts have normally a coarse lamellar microstructure, because it is sintered above the β transus temperature and it is cooled slowly in furnace. However, static mechanical properties such as tensile strength and ductility are equivalent to those of wrought materials, but they have the disadvantage that the fatigue strength is significantly lower than wrought materials. Therefore, improvement of fatigue strength is needed for injection molded Ti alloy compacts. In this study, injection molded Ti-6Al-4V compacts having equiaxed microstructure were prepared by sintering at α + β region temperature which is very lower than normal sintering temperature. When sintering is carried out in α + β region, sinterability is remarkably poor. Therefore, long-time sintering is required. Since the grain growth of the prior β grains was suppressed by the pinning effect of α grains and pores, it was possible to obtain the significantly fine grains as compared with the β region sintered compacts. The α + β region sintered compacts showed high strength, high elongation and also high fatigue strength. Furthermore, by applying HIP treatment, the mechanical properties were improved to satisfy the standard value of wrought Ti-6Al-4V material. |
| format |
article |
| author |
Kentaro KUDO Kazunari SHINAGAWA Hideshi MIURA |
| author_facet |
Kentaro KUDO Kazunari SHINAGAWA Hideshi MIURA |
| author_sort |
Kentaro KUDO |
| title |
Effect of α + β region sintering on the mechanical properties of injection molded Ti-6Al-4V compacts |
| title_short |
Effect of α + β region sintering on the mechanical properties of injection molded Ti-6Al-4V compacts |
| title_full |
Effect of α + β region sintering on the mechanical properties of injection molded Ti-6Al-4V compacts |
| title_fullStr |
Effect of α + β region sintering on the mechanical properties of injection molded Ti-6Al-4V compacts |
| title_full_unstemmed |
Effect of α + β region sintering on the mechanical properties of injection molded Ti-6Al-4V compacts |
| title_sort |
effect of α + β region sintering on the mechanical properties of injection molded ti-6al-4v compacts |
| publisher |
The Japan Society of Mechanical Engineers |
| publishDate |
2018 |
| url |
https://doaj.org/article/b330101693fa4a0cac162eddc8dc19cb |
| work_keys_str_mv |
AT kentarokudo effectofabregionsinteringonthemechanicalpropertiesofinjectionmoldedti6al4vcompacts AT kazunarishinagawa effectofabregionsinteringonthemechanicalpropertiesofinjectionmoldedti6al4vcompacts AT hideshimiura effectofabregionsinteringonthemechanicalpropertiesofinjectionmoldedti6al4vcompacts |
| _version_ |
1718409679107784704 |