THE EFFECT OF GRAIN-SIZE UPON THE FATIGUE-CRACK PROPAGATION BEHAVIOR OF ALLOY-718 UNDER HOLD-TIME CYCLING AT ELEVATED-TEMPERATURE

被引：34
|
作者：
JAMES, LA
机构：
[1] Westinghouse Hanford Co, Richland,, WA, USA, Westinghouse Hanford Co, Richland, WA, USA
来源：
ENGINEERING FRACTURE MECHANICS | 1986年 / 25卷 / 03期
关键词：
METALLOGRAPHY - Grain Growth - METALS TESTING - Thermal Effects;
D O I：
10.1016/0013-7944(86)90127-X
中图分类号：
O3 [力学];
学科分类号：
08 ; 0801 ;
摘要：
Fatigue-crack propagation tests were conducted in air at 538 degree C on several specimens of Alloy 718 representing several different producers, melt practices and product forms. This variety resulted in a range of grain sizes from ASTM Size 5 to 11. 5. Tests at low cyclic frequency employing a tensile hold-time revealed a relationship between crack growth rates and grain size: higher growth rates were associated with fine-grain material and lower rates with larger-grain material. The lowest crack growth rates were associated with a necklace microstructure, whereby large grains are associated with necklaces of very small grains.
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页码：305 / &
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