Effects of Co and Al Contents on Cryogenic Mechanical Properties and Hydrogen Embrittlement for Austenitic Alloys
- Conference date: 22-26 September 2003
- Location: Anchorage, Alaska (USA)
The effects of Co and Al content on ambient and cryogenic mechanical properties, microstructure and hydrogen embrittlement of a high strength precipitate‐strengthened austenitic alloy (Fe‐Ni‐Cr‐Mo system) had been investigated with temperature range from 293K to 77 K. Hydrogen embrittlement tests were conducted using the method of high pressure thermal hydrogen charging. It was found that increasing Co content can cause increasing in ambient and cryogenic ductility, but has less effect on ultimate tensile strength. When Co content is 9.8%, obvious decrease was found in cryogenic yield strength. Increasing Al content can result in decreasing ambient and cryogenic ductility and severe hydrogen embrittlement, but slight increase in cryogenic yield strength. Increasing Co content, reducing Al content, and decreasing test temperature tend to decrease the hydrogen embrittlement tendency for the alloys. This work showed that the alloy with composition of Fe‐31%Ni‐15%Cr‐5%Co‐4.5%Mo‐2.4%Ti‐0.3%Al‐0.3%Nb‐0.2%V has the superior cryogenic mechanical properties and lower hydrogen embrittlement tendency, is a good high strength cryogenic hydrogen‐resistant material.
- Mechanical properties
- High pressure
- Materials properties
- Microstructural properties
- Stress strain relations
- Thermal conduction
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