Journal ArticleDOI
The Effect of Heat Treatment on the Room Temperature and Elevated Temperature Fracture Toughness Response of Alloy 718
TLDR
In this paper, the effect of heat treatment on the JIC fracture toughness behavior of Alloy 718 was characterized at room temperature, 427°C and 538°C, and two different heat treatments were used: the conventional (ASTM A637) treatment, and a modified heat treatment designed to improve the toughness of alloy 718 base metal and weldments.Abstract:
The effect of heat treatment on the JIC fracture toughness behavior of Alloy 718 was characterized at room temperature, 427°C and 538°C. Two different heat treatments were used: the conventional (ASTM A637) treatment, and a modified heat treatment designed to improve the toughness of Alloy 718 base metal and weldments. The elastic-plastic JIC fracture toughness response of the modified Alloy 718 was found to be superior to the JIC behavior exhibited by the conventional material over the entire test temperature range. Metallographic and fractographic examinations of Alloy 718 fracture surfaces revealed that the inferior fracture resistance of the conventional superalloy was attributed to the presence of coarse δ precipitates throughout the conventional matrix. The increased fracture toughness response of the modified Alloy 718 was related to the dissolution of coarse δ precipitates during the high temperature solution anneal employed in the modified treatment.read more
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Journal ArticleDOI
The Status and Prospects of Alloy 718
TL;DR: While development oflnconel 718 has continued unabated over the alloy's long history, certain properties must still be improved to insure its application in components of the future as discussed by the authors.
Proceedings ArticleDOI
Development of a damage tolerant microstructure for inconel 718 turbine disc material
TL;DR: A modified heat treatment for Inconel 718 has been developed in this article, which is a result of tailoring the microstructure to obtain the optimum combination of grain size, grain boundary structure and matrix precipitate morphology.
Journal ArticleDOI
Effect of boron and carbon on the fracture toughness of IN 718 superalloy at room temperature and 650 °C
TL;DR: In this paper, the effect of B and C microadditions on the fracture toughness of IN 718 superalloy was investigated at room temperature (RT) and at 650 °C.
Journal ArticleDOI
Effect of microstructural constituents on mechanical properties and fracture toughness of Inconel 718 with anomalous deformation behavior at 650 °C
TL;DR: In this article, the Inconel 718 superalloy was subjected to five different heat treatment schedules to develop five different microstructures for studying the effect of γ', γ'' and δ phases on mechanical properties of IN-718 at room temperature and 650°C.
Journal ArticleDOI
Effects of irradiation on the fracture toughness of fbr structural materials
D.J. Michel,R.A. Gray +1 more
TL;DR: In this paper, the elastic-plastic fracture toughness of fast neutron irradiated reactor structural materials was investigated at 427 °C using a single-specimen compliance test method, which included Alloy 718, Type 308 weldment, 20% cold worked Type 316 stainless steel and annealed Types 304 and 316 steels.