The relationship between fatigue strength and microstructure in an austempered Cu-Ni-Mn-Mo alloyed ductile iron

被引：42

作者：

Bahmani, M ^{[1
]}

Elliott, R ^{[1
]}

Varahram, N ^{[1
]}

机构：

[1] SHARIF UNIV TECHNOL,TEHRAN,IRAN

来源：

JOURNAL OF MATERIALS SCIENCE | 1997年 / 32卷 / 20期

关键词：

Ferrite; Austenite; Martensite; Fatigue Strength; Ductile Iron;

D O I：

10.1023/A:1018631314765

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

Rotating bending fatigue measurements are reported for an austempered ductile iron containing 3.5wt% C, 2.6wt% Si, 0.48wt% Cu, 0.96wt% Ni, 0.27wt% Mo, and 0.25wt% Mn. The iron was austenitized at 870, 900 and 950 degrees C and then austempered at 370 and 400 degrees C for times between 30 and 240 min to obtain various austempered microstructures. The correlation between fatigue strength and austempered microstructure represented by the para meter X gamma C gamma, where X gamma is the amount of high C austenite and C gamma its C content is examined. It is shown that fatigue strength increases as X gamma C gamma increases. The highest fatigue strength is obtained with an ausferrite structure; the presence of martensite and/or carbide in the structure reduces the fatigue strength. Lower austenitizing temperatures increase the fatigue strength.

引用

页码：5383 / 5388

页数：6