METALLURGICAL FACTORS INFLUENCING THE MAGNETIC ANALYSIS OF SURFACE HARDENED AND TEMPERED STEEL.
Abstract
An electron microscope study of microstructural changes induced by progressive tempering of carburized, oil quenched, refrigerated (-100 F) and unrefrigerated 1/8 - x 3/4 - x 3/4 -in. specimens of H-8620 steel showed a significant magnetic change to accompany the appearance of percarbides in martensite plates while retained austenite and residual stress have remained unchanged. Retained austenite was found to influence magnetic measurements. Distributions from surface into core were determined for retained austenite and residual stress resulting from 1650 F, 1 1/2 hour carburizing (soild) followed by oil quenching, brine quenching, oil quenching and refrigerating at -100 F, and liquid nitrogen quenching for both 1/8 - and 1/4 - in. thick specimens. All attempts to effect residual stress relaxation by exposure to a magnetic field were unsuccessful. (Author)
Document Details
- Document Type
- Technical Report
- Publication Date
- Oct 01, 1963
- Accession Number
- AD0422662
Entities
People
- Edward L. Bartholomew Jr.
Organizations
- University of Connecticut