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Title: Effect of precipitated austenite on the fracture of a ferritic cryogenic steel. [Fe-8Ni-2Mn-0. 1Ti]

Abstract

The effect of precipitated austenite on the fracture of an Fe-8Ni-2Mn-0.1Ti steel was investigated. To understand the effect an attempt was made to correlate the microstructure, mechanical properties, and the fracture surface appearance of specimens heat treated to contain austenite or be austenite-free. The fracture surfaces were quantitatively studied using a 3D imaging technique in the SEM. It was found that the presence of austenite had a beneficial influence on mechanical properties by lowering the DBTT. Part of this decrease was found to be due to the austenite gettering deleterious elements off the grain boundaries. Specimens that contained precipitated austenite were also found to have a smaller median facet size, when fractured in a brittle transgranular mode, than specimens with no austenite. The decrease in DBTT and change in fracture surface appearance is related to the austenite transforming to martensite of a different variant than the matrix which effectively grain refines the steel and raises the cleavage stress.

Authors:
Publication Date:
Research Org.:
Lawrence Berkeley Lab., CA (USA)
OSTI Identifier:
6755560
Report Number(s):
LBL-17910
ON: DE84014604
DOE Contract Number:  
AC03-76SF00098
Resource Type:
Technical Report
Resource Relation:
Other Information: Portions are illegible in microfiche products. Thesis
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; FERRITIC STEELS; FRACTURE PROPERTIES; NICKEL STEELS; AUSTENITE; CRACK PROPAGATION; DUCTILE-BRITTLE TRANSITIONS; MECHANICAL PROPERTIES; MICROSTRUCTURE; SURFACES; TRANSITION TEMPERATURE; ALLOYS; CARBON ADDITIONS; CRYSTAL STRUCTURE; IRON ALLOYS; IRON BASE ALLOYS; NICKEL ALLOYS; PHYSICAL PROPERTIES; STEELS; THERMODYNAMIC PROPERTIES; 360103* - Metals & Alloys- Mechanical Properties

Citation Formats

Frear, D R. Effect of precipitated austenite on the fracture of a ferritic cryogenic steel. [Fe-8Ni-2Mn-0. 1Ti]. United States: N. p., 1984. Web.
Frear, D R. Effect of precipitated austenite on the fracture of a ferritic cryogenic steel. [Fe-8Ni-2Mn-0. 1Ti]. United States.
Frear, D R. Tue . "Effect of precipitated austenite on the fracture of a ferritic cryogenic steel. [Fe-8Ni-2Mn-0. 1Ti]". United States.
@article{osti_6755560,
title = {Effect of precipitated austenite on the fracture of a ferritic cryogenic steel. [Fe-8Ni-2Mn-0. 1Ti]},
author = {Frear, D R},
abstractNote = {The effect of precipitated austenite on the fracture of an Fe-8Ni-2Mn-0.1Ti steel was investigated. To understand the effect an attempt was made to correlate the microstructure, mechanical properties, and the fracture surface appearance of specimens heat treated to contain austenite or be austenite-free. The fracture surfaces were quantitatively studied using a 3D imaging technique in the SEM. It was found that the presence of austenite had a beneficial influence on mechanical properties by lowering the DBTT. Part of this decrease was found to be due to the austenite gettering deleterious elements off the grain boundaries. Specimens that contained precipitated austenite were also found to have a smaller median facet size, when fractured in a brittle transgranular mode, than specimens with no austenite. The decrease in DBTT and change in fracture surface appearance is related to the austenite transforming to martensite of a different variant than the matrix which effectively grain refines the steel and raises the cleavage stress.},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = {1984},
month = {5}
}

Technical Report:
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