RESEARCH ON INTERSTITIAL ALLOYING ELEMENTS IN THE MECHANICAL BEHAVIOR OF METALS
Abstract
A 9% Ni steel heat treated to obtain structures with 0, 3, and 13% austenite was used to investigate the influence of retained austenite on the H embrittlement phenomenon. Ductility was determined as a function of H concentration. The recovery of ductility by baking the hydrogenated specimens and the effect of transforming the H charged 13% austenite on the embrittlement were studied. The presence of retained austenite in the 9% Ni steel minimized the embrittling effects of H, but acted as a sink for H during baking treatments. Transformation of the 13% austenite after charging and baking caused additional embrittlement. Static loading at 400 F of hydrogenated K-monel, with an NTS of 260,000 psi, baked 5 min at 950 F indicated that this alloy is subject to delayed failure. Delayed failure by discontinuous crack propagation was observed in 300 m ultra-high-strength steel (.43% C, .89% Mn, 1.78% Si) sheet at various temperatures between 150 and 530 F. An effort is being made to ascertain the mechanism responsible for the existence of a fracture strength minimum as a function of time to rupture.
Document Details
- Document Type
- Technical Report
- Publication Date
- May 01, 1961
- Accession Number
- AD0259191
Entities
People
- C. Koch
- J. Destrez
Organizations
- Case Western Reserve University