ELEVATED-TEMPERATURE FATIGUE BEHAVIOR OF TUNGSTEN FIBER-REINFORCED SUPERALLOY COMPOSITES

被引：0
|
作者：
YUEN, JL [1 ]
PETRASEK, DW [1 ]
机构：
[1] NASA,LEWIS RES CTR,CLEVELAND,OH 44135
来源：
JOURNAL OF COMPOSITES TECHNOLOGY & RESEARCH | 1994年 / 16卷 / 04期
关键词：
COMPOSITES; TUNGSTEN FIBER; METAL MATRIX; SUPERALLOYS; TYPE 316 STAINLESS STEEL; INCOLOY; 907; WASPALOY; FATIGUE; ELEVATED TEMPERATURES; FRACTOGRAPHY; INERT GAS; THERMAL SHOCK;
D O I：
暂无
中图分类号：
TB33 [复合材料];
学科分类号：
摘要：
The low- and high-cycle fatigue behavior of three different fiber-reinforced superalloy (FRS) composite materials were evaluated. Each composite material contained 40 vol% unidirectionally aligned continuous length tungsten-1.5 wt% ThO2 fibers. The metal matrices were Waspaloy, Type 316L stainless steel, and Incoloy 907. Fatigue tests were conducted at 871 degrees C in a helium atmosphere under load control with a load ratio (minimum stress/maximum stress) of 0.2. The composites were found to have excellent elevated temperature fatigue strength. The fibers played a major role in controlling the fatigue strength of the composites. Fatigue crack fronts were found to be retarded by the fibers. The cracks tended to branch at the fiber/matrix interface and grew by a sliding made along the interface. Matrix surface cracks induced by thermal shock damage had little influence on the fatigue strength of the FRS composites.
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页码：343 / 351
页数：9
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