Casting Defects of Ti-6Al-4V Alloy in Vertical Centrifugal Casting Processes with Graphite Molds

被引：25

作者：

Jia, Limin ^{[1
,2
]}

Xu, Daming ^{[2
]}

Li, Min ^{[3
]}

Guo, Jingjie ^{[2
]}

Fu, Hengzhi ^{[2
]}

机构：

[1] Hebei Univ Sci & Technol, Sch Mat Sci & Engn, Shijiazhuang 050018, Peoples R China

[2] Harbin Inst Technol, Inst Solidificat Proc Adv Mat, Sch Mat Sci & Engn, Harbin 150001, Peoples R China

[3] Tianjin Univ Technol & Educ, Tianjin Key Lab High Speed Cutting & Precis Machi, Tianjin 300222, Peoples R China

来源：

METALS AND MATERIALS INTERNATIONAL | 2012年 / 18卷 / 01期

关键词：

alloys; casting; defects; scanning electron microscopy (SEM); graphite mold; TITANIUM;

D O I：

10.1007/s12540-012-0007-0

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

Numerical simulation and experimental investigation are utilized to analyze the casting defects of Ti-6Al-4V alloy formed under different vertical centrifugal casting conditions in graphite molds. Mold rotating rates of 0, 110 and 210 rpm are considered in experimental process. Results show that centrifugal forces have significant effects on the quantity of both macropores and microdefects (micropores, microcracks and inclusions). The relative amount of all macro-and micro-scopic casting defects decreases from 62.4 % to 24.8 % with the increasing of the centrifugal force, and the macropore quantity in stepped casting decreases exponentially with the increase of the gravitation coefficient. The relative proportions of both micropores and microcracks decrease with the mold-rotating rate increase, but the relative proportion of inclusions increases significantly. Besides this, the mold-filling sequence is proved to be an important factor in casting quality control.

引用

页码：55 / 61

页数：7

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