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

被引：37

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.

引用

页码：305 / &

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