Accession Number:

ADA222105

Title:

Microstructural Development in HSLA-100 Steel Weld Metals

Descriptive Note:

Annual progress rept. no. 1

Corporate Author:

PENNSYLVANIA STATE UNIV UNIVERSITY PARK

Personal Author(s):

Report Date:

1990-01-01

Pagination or Media Count:

38.0

Abstract:

Light microscopy, scanning electron microscopy SEM and transmission electron microscopy TEM have been employed to examine the decomposition of austenite in high-strength low alloy 100 steels. The as-received plate had been quenched and tempered and low magnification imaging suggested that the microstructure comprised lath martensite and granular bainite. However, at higher magnifications, much of the so-called granular bainite was found to consist of equiaxed ferrite which contained pools of austenite andor martensite. The tempering treatment yielded fine dispersions of epsilon-copper, with both the lath martensite and the granular bainite. Finally, the occasional observation of interphase precipitation in association with ferrite suggests that the proeutectoid ferrite reaction had initiated prior to quenching from the austenizing temperature. For samples which had been reaustenitized and ice-water quenched, the microstructure consisted primarily of lath martensite although some granular bainite also observed. Slow furnace cooling from the austenitic range yielded an equiaxed grain structure which could be designated as granular bainite.

Subject Categories:

  • Metallurgy and Metallography

Distribution Statement:

APPROVED FOR PUBLIC RELEASE