A Study of the Microstructural Basis for the Strength and Toughness Properties of As-Quenched and Quenched and Tempered High Copper HSLA-100 Steel
Abstract
This report discusses a program for the use of high copper HSLA-100 steel as a replacement for HY-130 in ship construction. The characterization of the microstructure of this highly weldable high copper HSLA-100 steel is extremely important to this program. In the present work, optical, scanning, scanning electron and transmission electron microscopy were employed to analyze and characterize the microstructural basis for the mechanical properties off as- quenched and quenched and tempered high copper HSLA-100 steel in form of 19.05 mm plate. The as-quenched and samples aged at 538 C and 621 C were examined in great detail. In the as-quenched condition the microstructure consisted of small packets of highly dislocated lath martensite containing autotempered iron carbides with small amounts of retained austenite present as thin films (200-300 A in width) at lath boundaries. The best combination of strength and toughness occurred in the sample aged at 538 C. Contributing to these desirable characteristics was the recovery of the dislocation substructures, the precipitation of coherent BCC copper precipitates (12-20 A in size) further precipitation (FeM)3C.
Document Details
- Document Type
- Technical Report
- Publication Date
- Dec 01, 1991
- Accession Number
- ADA245151
Entities
People
- Harvey A. Winters
Organizations
- Naval Postgraduate School