The Effect of Austenitizing Conditions on the Anisotropic Embrittlement of ESR (Electroslag Remelted) 4340 Steel.
Abstract
The effect of austenitizing conditions on the anisotropic embrittlement of electroslag remelted (ESR) 4340 steel were studied. Increasing austenitzing of temperature from 1550 F to 1750 F had little or no effect on the strength and toughness of ESR melted 4340 steel. Decreasing the quench rate from 1000 F per minute to 500 F per minute had no effect on the strength and toughness. Decreasing the quench rate from 500 F per minute to 100 F per minute had a significant effect on Charpy V-notch toughness. Lower Charpy V-notch toughness associated with the quench rate of 100 F per minute was due to the presence of bainite in the microstructure. The presence of bainite had a small effect on a slow blend fracture toughness. Plate anisotropy was very small in the plane of the plate (longitudinal versus transverse). Properties normal to the plane of the plate were affected drastically. Charpy V-notch toughness was decreased as much as 56% over the values obtained in the longitudinal direction. Reduction in area of the mild notch tensile specimen was decreased as much as 64% in the through-thickness direction when compared to the longitudinal direction. Inclusion clusters were primarily alumina with some calcium present. In all the tests conducted, there was no evidence for anisotropic embrittlement of this material (i.e., intergranular fracture).
Document Details
- Document Type
- Technical Report
- Publication Date
- Oct 01, 1986
- Accession Number
- ADA175278
Entities
People
- A. D. Wilson
- E. G. Hamburg