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Title: Mechanisms of embrittlement during tempering of Cartech X-53 steel

Abstract

The effects of austenitizing and tempering heat treatments on the structure and properties of Cartech X-53 steel, a carburizing grade tool steel containing Mo and Cr among its alloying elements, have been investigated. The results of tensile and hardness testing show behavior typical of a secondary-hardening steel, but Charpy V-notch tests show increasing embrittlement with increasing tempering temperature in the range of 260C to 590C. Intergranular embrittlement was observed in the Charpy specimens double tempered at 540C and 590C and in specimens aged for 1000h at 260C, where extensive precipitation of M{sub 6}C (M=Fe,Mo) carbides along prior austenite grain boundaries was revealed by electron microscopy. Specimens double tempered at 370C and 480C did not show any intergranular fracture despite the presence of grain boundary carbides. The embrittlement observed at 370C is believed to be due to precipitation of carbides along martensite lath boundaries. Microstructural evidence of the embrittlement mechanisms is presented along with the mechanical data.

Authors:
;  [1]
  1. Army Materials and Mechanics Research Center, Watertown, MA (USA)
OSTI Identifier:
5442645
Report Number(s):
CONF-840909-
Journal ID: ISSN 0197-1689; CODEN: TMPSA
Resource Type:
Conference
Journal Name:
TMS (The Metallurgical Society) Paper Selection; (USA)
Additional Journal Information:
Journal Volume: 56; Conference: TMS-AIME fall meeting, Detroit, MI (USA), 16-20 Sep 1984; Journal ID: ISSN 0197-1689
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; CHROMIUM-MOLYBDENUM STEELS; EMBRITTLEMENT; CARBIDES; ELECTRON MICROSCOPY; FRACTURES; GRAIN BOUNDARIES; HARDNESS; HEAT TREATMENTS; MECHANICAL TESTS; MECHANICS; MICROSTRUCTURE; TEMPERATURE DEPENDENCE; TEMPERING; TENSILE PROPERTIES; CARBON COMPOUNDS; CRYSTAL STRUCTURE; FAILURES; MATERIALS TESTING; MECHANICAL PROPERTIES; MICROSCOPY; TESTING; 360103* - Metals & Alloys- Mechanical Properties

Citation Formats

Krzanowski, J E, and Fopiano, P J. Mechanisms of embrittlement during tempering of Cartech X-53 steel. United States: N. p., Web.
Krzanowski, J E, & Fopiano, P J. Mechanisms of embrittlement during tempering of Cartech X-53 steel. United States.
Krzanowski, J E, and Fopiano, P J. . "Mechanisms of embrittlement during tempering of Cartech X-53 steel". United States.
@article{osti_5442645,
title = {Mechanisms of embrittlement during tempering of Cartech X-53 steel},
author = {Krzanowski, J E and Fopiano, P J},
abstractNote = {The effects of austenitizing and tempering heat treatments on the structure and properties of Cartech X-53 steel, a carburizing grade tool steel containing Mo and Cr among its alloying elements, have been investigated. The results of tensile and hardness testing show behavior typical of a secondary-hardening steel, but Charpy V-notch tests show increasing embrittlement with increasing tempering temperature in the range of 260C to 590C. Intergranular embrittlement was observed in the Charpy specimens double tempered at 540C and 590C and in specimens aged for 1000h at 260C, where extensive precipitation of M{sub 6}C (M=Fe,Mo) carbides along prior austenite grain boundaries was revealed by electron microscopy. Specimens double tempered at 370C and 480C did not show any intergranular fracture despite the presence of grain boundary carbides. The embrittlement observed at 370C is believed to be due to precipitation of carbides along martensite lath boundaries. Microstructural evidence of the embrittlement mechanisms is presented along with the mechanical data.},
doi = {},
journal = {TMS (The Metallurgical Society) Paper Selection; (USA)},
issn = {0197-1689},
number = ,
volume = 56,
place = {United States},
year = {},
month = {}
}

Conference:
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