scholarly journals Environmental influences on high temperature fatigue strength and creep strength of Hastelloy XR.

1988 ◽  
Vol 37 (413) ◽  
pp. 185-190
Author(s):  
Kiyoshi HASEGAWA ◽  
Shozo OKAZAKI ◽  
Shozo MATSUDA
Keyword(s):  
High Temperature ◽  
Fatigue Strength ◽  
Creep Strength ◽  
Environmental Influences ◽  
High Temperature 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.

scholarly journals Notch Effect on High Temperature Fatigue Strength of 18-8 Stainless Steel

1964 ◽  
Vol 13 (131) ◽  
pp. 625-630 ◽  
Author(s):  
Tadakazu SAKURAI ◽  
Jun-ichi MASAKI ◽  
Toshio KITAMOTO
Keyword(s):  
Stainless Steel ◽  
High Temperature ◽  
Fatigue Strength ◽  
Notch Effect ◽  
High Temperature Fatigue
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