FRANÇAIS
A showcase of ÉTS researchers’ publications and other contributions
SEARCH

Simultaneous enhancement of strength and ductility in cryogenically treated AISI D2 tool steel

Ghasemi-Nanesa, Hadi and Jahazi, Mohammad. 2014. « Simultaneous enhancement of strength and ductility in cryogenically treated AISI D2 tool steel ». Materials Science and Engineering: A, vol. 598. pp. 413-419.
Compte des citations dans Scopus : 35.

[thumbnail of Jahazi M. 2014 9672 Simultaneous enhancement of strength and ductility.pdf]
Preview
PDF
Jahazi M. 2014 9672 Simultaneous enhancement of strength and ductility.pdf - Accepted Version
Use licence: Creative Commons CC BY-NC-ND.

Download (616kB) | Preview

Abstract

In this research, the effect of cryogenic treatment on microstructural evolution and mechanical properties enhancement of AISI D2 tool steel was investigated. Cryogenic treatment down to liquid nitrogen temperature (77 K) was added to the conventional heat treatment between hardening and tempering steps. Electron microscopy investigation showed higher volume fraction of fine carbides with average diameter below 1 μm indicating effective retardation in carbide coarsening process as a results of cryogenic treatment. A modification in types of carbides was also observed after cryogenic treatment. X-ray diffraction diagrams revealed transformation of retained austenite to martensite at cryogenic temperature. Weakening or removal of carbides peak in the X-ray diagram was considered as evidence of carbides different behavior at cryogenic temperature. Mechanical testing results indicated higher ultimate tensile strength, better ductility, and higher elastic modulus after cryogenic treatment. Analysis of stress–strain diagrams revealed different strain hardening behavior for cryogenically treated alloy when compared to the conventionally heat treated one. Fractography results confirmed strain hardening behavior and showed cleavage fracture for conventionally treated alloy but mixed cleavage–ductile fracture mode for cryogenically treated alloy. The improved mechanical properties after cryogenic treatment are interpreted in terms of the influence of higher volume fraction and uniform distribution of fine carbides in reducing the average active dislocations length and enhancement of the flow stress at any given plastic strain.

Item Type: Peer reviewed article published in a journal
Professor:
Professor
Jahazi, Mohammad
Affiliation: Génie mécanique
Date Deposited: 08 Jun 2015 12:01
Last Modified: 08 Sep 2024 19:11
URI: https://espace2.etsmtl.ca/id/eprint/9672

Actions (login required)

View Item View Item