Microstructure and mechanical properties of high copper HSLA-100 steel in 2-inch plate form

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microstructureme00suka.pdf (4.94 MB)
Authors
Suka, Akira
Subjects
Steel
High copper HSLA-100 steel
Mechanical property
Microstructure
Advisors
Fox, Alan G.
Date of Issue
1992-06
Date
June 1992
Publisher
Monterey, California. Naval Postgraduate School
Language
en_US
Abstract
The microstructure and mechanical properties of highly welda ble high copper HSLA-100 steel in two-inch (50 mm) plate form were investigated in this work. The mechanical property data showed that the steel in the as-quenched and aged conditions not only met the mechanical property specifications of the Navy for HSLA (HY) 100 steels but also satisfied the requirements for HY-130 steels. Optical, scanning and transmission electron microscope studies of the as-quenched plate indicated that the microstructure was a mixture of lath martensite/retained austenite and bainitic ferrite, which is typical of these steels. On aging this microstructure developed the tempered structures usually encountered in HSLA steels. This investigation concludes that: Increased copper HSLA steel meets all the mechanical property specifications of Navy HSLA-100 ksi yield strength steel regardless of heat treatment and plate thickness (up to 50 mm thickness). High copper HSLA-100 steel in 50 mm plate form can fulfill all the mechanical property requirements of Navy 130 ksi yield strength steel with an appropriate temper. The microstructures formed with various heat treatments are consistent with the HSLA-100 CCT diagram. Increasing copper in HSLA-100 steel also increases the toughness as well as the strength, though the dynamics of this process is not clear.
Type
Thesis
Description
URI
https://hdl.handle.net/10945/23957
Series/Report No
Department
Mechanical Engineering
Organization
Naval Postgraduate School (U.S.)
Identifiers
NPS Report Number
Sponsors
Funder
Format
54 p.
Citation
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Approved for public release; distribution is unlimited.
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