Forming Mechanism and Processing Control of Hot Crack in Die-casting Magnesium Alloys

Liao Huimin~1; Long Siyuan~1; Cao Hanxue~1; Shi Guanghua~2; Zhang Zonghe~2

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Forming Mechanism and Processing Control of Hot Crack in Die-casting Magnesium Alloys
Issue 6, Pages: 350-352(2006)
Published： 2006 ，
DOI：

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[1]廖慧敏,龙思远,曹韩学,石光华,章宗和.镁合金压铸热裂纹形成机制及工艺对策[J].特种铸造及有色合金,2006(06):350-352+318.

Liao Huimin~1, Long Siyuan~1, Cao Hanxue~1, et al. Forming Mechanism and Processing Control of Hot Crack in Die-casting Magnesium Alloys. [J]. Special Casting & Nonferrous Alloys (6):350-352(2006)
[1]廖慧敏,龙思远,曹韩学,石光华,章宗和.镁合金压铸热裂纹形成机制及工艺对策[J].特种铸造及有色合金,2006(06):350-352+318. DOI：

Liao Huimin~1, Long Siyuan~1, Cao Hanxue~1, et al. Forming Mechanism and Processing Control of Hot Crack in Die-casting Magnesium Alloys. [J]. Special Casting & Nonferrous Alloys (6):350-352(2006) DOI：

摘要

观察了镁合金压铸生产中常见的热裂纹缺陷

并对其的形成机制进行了详细分析

结果表明:热裂纹产生的主要原因是压铸镁合金在凝固温度区间热强度低、热脆性高以及收缩应力集中所致。为了消除热裂纹缺陷

提出了通过控制合金原材料成分、适当增加铸件热裂处圆角尺寸

同时调整压铸工艺参数的方法。

Abstract

The hot crack in die-casting magnesium alloys was observed

and its forming mechanism was analyzed in detail. The results show that the hot crack is resulted from the low thermal intensity

high hot brittleness and concentration of shrinkage stress in solidifying point area. The hot crack can be eliminated by properly adjusting chemical composition of the Mg alloy

enlarging chamfer size in hot crack position and altering processing parameters.