Segregation Effects and the Toughness of High-Strength Steels.
Abstract
An account is given of previous research in the field of intergranular cohesion in steels. Recent research, particularly on the problems of temper embrittlement and overheating, is included. Transition temperature measurement is shown to be a suitable method of examining the susceptibility to embrittlement in as-quenched and quenched and lightly tempered materials. Tempering at 350C produces strong embrittlement which is considered to be due to the presence of 60ppm P. Embrittlement was not observed in the as-quenched condition and it is suggested that the tempering process is the critical stage. In the materials examined molybdenum appeared to reduce or eliminate embrittlement produced by tempering at 350C for up to 4 hours. In air-melted material (0.010%S) the effect of both austenitizing temperature and overheating on toughness was found to be small. In vacuum-melted material (0.007%S) austenitizing temperature produced a larger variation in the as-quenched toughness; this effect was reduced after tempering at 300C.
Document Details
- Document Type
- Technical Report
- Publication Date
- Oct 01, 1974
- Accession Number
- ADA006208
Entities
People
- John F. Knott
- John Q. Clayton
Organizations
- University of Cambridge