Comparative Fracture Toughness Testing of Cryogenic Alloys at Liquid Helium Temperature.
Abstract
Fracture behavior of the Fe-12Ni-0.25Ti alloy grain refined through thermal cycling was studied down to liquid helium temperature using a simple method of cryogenic fracture toughness testing. Comparison tests were also made with two other common cryogenic alloys. Ultrafine grained Fe-12Ni-0.25Ti alloy, which is 100% ferritic, behaved in a ductile manner similar to 304 austenitic steel. It was shown that the ductile-brittle transition temperature of the ferritic steel specimen can be suppressed below liquid helium temperature by grain refinement even in the presence of a sharp crack. Yield strength at liquid nitrogen temperature, and yield strength at liquid helium temperature were obtained. (Modified author abstract)
Document Details
- Document Type
- Technical Report
- Publication Date
- Aug 01, 1974
- Accession Number
- AD0786229
Entities
People
- J. W. Morris Jr.
- S. K. Hwang
- Sungho Jin
Organizations
- University of California, Berkeley