Grain Boundary Precipitation Treatment for Improving the High-Temperature Low-Cycle Fatigue Strength of SSS113M for VHTRs

1984 ◽  
Vol 66 (1) ◽  
pp. 69-74 ◽  
Author(s):  
Rikizo Watanabe
Keyword(s):  
High Temperature ◽  
Fatigue Strength ◽  
Grain Boundary ◽  
Low Cycle Fatigue ◽  
Cycle Fatigue ◽  
Precipitation Treatment ◽  
Boundary Precipitation ◽  
Grain Boundary Precipitation

scholarly journals High Temperature Low-cycle Fatigue Properties and Grain Boundary Configuration in an Austenitic Heat Resisting Steel

1983 ◽  
Vol 69 (1) ◽  
pp. 97-106 ◽  
Author(s):  
Masaru YAMAMOTO ◽  
Yasushi HORIUCHI ◽  
Ohmi MIYAGAWA ◽  
Dai FUJISHIRO
Keyword(s):  
High Temperature ◽  
Grain Boundary ◽  
Low Cycle Fatigue ◽  
Fatigue Properties ◽  
Cycle Fatigue

A Review of Haynes® 230 and Haynes 617 Alloys for High Temperature Gas Cooled Reactors

2007 ◽  
Author(s):  
Michael Katcher ◽  
Dwaine L. Klarstrom
Keyword(s):  
High Temperature ◽  
Fatigue Life ◽  
Fatigue Strength ◽  
Grain Boundary ◽  
Creep Strength ◽  
Thermal Fatigue ◽  
Low Cycle Fatigue ◽  
Carbide Precipitation ◽  
Cooling Rates ◽  
High Temperature Gas

HAYNES 230 and 617 alloys are competing for use on Generation IV, high temperature gas cooled reactor components because of their good high temperature creep strength in the temperature range of 760°C and 982°C and resistance to attack in the gas cooled reactor environment. A review of the metallurgy affecting the properties in each alloy is provided. It is shown that the grain size and carbide precipitation developed during manufacture affect short term and long term ductility, fatigue life, and creep strength. For example, 230 alloy has a finer grained structure which promotes fatigue strength with a slight sacrifice in creep strength. The 617 alloy has a coarser grain structure which provides slightly higher creep resistance while sacrificing some fatigue strength. Thermal aging also introduces gamma prime precipitation to 617 alloy in addition to grain boundary carbides. This, along with grain boundary oxidation, reduces the low cycle fatigue strength of 617 alloy compared to 230 alloy. Independent studies have shown that 230 alloy possesses higher resistance to thermal fatigue than 617 alloy. However, welds of both base metals with similar weld composition have about the same thermal fatigue life. Cooling rates from solution annealing temperatures during processing affect the ductility and creep strength of these alloys with the highest cooling rates preferred for retention of ductility and creep strength. Slow cooling rates promote carbide precipitation in the grain boundaries which reduces ductility and creep strength.

High Temperature Low-Cycle Fatigue of Friction Welded Joints-Type 304-304 Stainless Steel and Alloy 718-718 Nickel Base Superalloy

1993 ◽  
Vol 115 (1) ◽  
pp. 109-115
Author(s):  
T. Wakai ◽  
M. Sakane ◽  
M. Ohnami ◽  
K. Okita ◽  
Y. Fukuchi
Keyword(s):  
Stainless Steel ◽  
High Temperature ◽  
Fatigue Strength ◽  
Base Metal ◽  
Welded Joints ◽  
Low Cycle Fatigue ◽  
304 Stainless Steel ◽  
Alloy 718 ◽  
Cycle Fatigue ◽  
Type 304

This paper assesses the high-temperature low-cycle fatigue of the Type 304 stainless steel and Alloy 718 superalloy friction-welded joints. Strain controlled low-cycle fatigue tests for 304-304 and 718-718 friction-welded specimens were carried out at 923K in air to obtain the fatigue strength of the joints. These materials were selected as the cyclic hardening and softening materials, respectively. The 304-304 welded specimens showed inferior fatigue strength in comparison with the base metal while the 718-718 specimens exhibited fatigue strength equivalent to that of the base metal. The difference in the fatigue strength between the two materials is discussed from the viewpoint of the cyclic deformation behavior and strain reduction at weld interface.

Grain Boundary Control During High Temperature Low Cycle Fatigue

1995 ◽  
Vol 34 (3) ◽  
pp. 237-241 ◽  
Author(s):  
Sabine Weiß ◽  
Dirk Ponge ◽  
Günter Gottstein
Keyword(s):  
High Temperature ◽  
Grain Boundary ◽  
Boundary Control ◽  
Low Cycle Fatigue ◽  
Cycle Fatigue
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