INFLUENCE OF MOLD AND POURING TEMPERATURES ON HOT TEARING SUSCEPTIBILITY OF AZ91D MAGNESIUM ALLOY

被引：44

作者：

Bichler, L. ^{[1
]}

Elsayed, A. ^{[1
]}

Lee, K. ^{[1
]}

Ravindran, C. ^{[1
]}

机构：

[1] Ryerson Univ, Ctr Near Net Shape Proc Mat, Toronto, ON, Canada

来源：

INTERNATIONAL JOURNAL OF METALCASTING | 2008年 / 2卷 / 01期

基金：

加拿大自然科学与工程研究理事会;

关键词：

hot tearing; Magnesium Alloy; AZ91D; permanent mold; mold temperature; yield strength and microstructure;

D O I：

10.1007/BF03355421

中图分类号：

TF [冶金工业];

学科分类号：

0806 ;

摘要：

This research focused primarily oil studying the effect of mold temperature on the hot tearing susceptibility of permanent mold cast (PMC) AZ91D magnesium alloy. The results suggest that increasing the mold temperature from 140 degrees C (282 F) to 380 degrees C (716 F) had a significant impact on the severity of hot tearing in the alloy. Mold temperatures above 340 degrees C (644 F) were seen to virtually eliminate hot tears through a morphological change of the alloy's beta-phase regions, which enabled liquid metal feeding of the casting at later stages of solid fraction and high fractions of solid. Variation of the mold temperature also affected the alloy yield strength and casting porosity. The effect of increasing the pouring temperature in the 680 - 720 degrees C (1256 - 1328 F) range to reduce hot tearing was less pronounced than that of varying the mold temperature.

引用

页码：43 / 56

页数：14

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