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Title: Crystallography of lath martensite and stabilization of retained austenite

TEM was used to study the morphology and crystallography of lath martensite in low and medium carbon steels in the as-quenched and 200/sup 0/C tempered conditions. The steels have microduplex structures of dislocated lath martensite and continuous thin films of retained austenite at the lath interfaces. Stacks of laths form the packets which are derived from different (111) variants of the same austenite grain. The residual parent austenite enables microdiffraction experiments with small electron beam spot sizes for the orientation relationships (OR) between austenite and martensite. All three most commonly observed ORs, namely Kurdjumov-Sachs, Nishiyama-Wassermann, and Greninger-Troiano, operate within the same sample.
Authors:
Publication Date:
OSTI Identifier:
6620798
Report Number(s):
LBL-15111
ON: DE83003714
DOE Contract Number:
AC03-76SF00098
Resource Type:
Technical Report
Resource Relation:
Other Information: Thesis. Portions of document are illegible
Research Org:
Lawrence Berkeley Lab., CA (USA)
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; CARBON STEELS; CRYSTALLOGRAPHY; MICROSTRUCTURE; AUSTENITE; ELECTRON DIFFRACTION; HEAT TREATMENTS; LATTICE PARAMETERS; MARTENSITE; MORPHOLOGY; TRANSMISSION ELECTRON MICROSCOPY; ALLOYS; CARBON ADDITIONS; COHERENT SCATTERING; CRYSTAL STRUCTURE; DIFFRACTION; ELECTRON MICROSCOPY; IRON ALLOYS; IRON BASE ALLOYS; MICROSCOPY; SCATTERING; STEELS 360102* -- Metals & Alloys-- Structure & Phase Studies