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Title: Effect of cryogenic treatment on tensile behavior of case carburized steel-815M17

Abstract

The crown wheel and pinion represent the most highly stressed parts of a heavy vehicle; these are typically made of 815M17 steel. The reasons for the frequent failure of these components are due to tooth bending impact, wear and fatigue. The modern processes employed to produce these as high, durable components include cryogenic treatment as well as conventional heat treatment. It helps to convert retained austenite into martensite as well as promote carbide precipitation. This paper deals with the influence of cryogenic treatment on the tensile behavior of case carburized steel 815M17. The impetus for studying the tensile properties of gear steels is to ensure that steels used in gears have sufficient tensile strength to prevent failure when gears are subjected to tensile or fatigue loads, and to provide basic design information on the strength of 815M17 steel. A comparative study on the effects of deep cryogenic treatment (DCT), shallow cryogenic treatment (SCT) and conventional heat treatment (CHT) was made by means of tension testing. This test was conducted as per ASTM standard designation E 8M. The present results confirm that the tensile behavior is marginally reduced after cryogenic treatment (i.e. both shallow and deep cryogenic treatment) for 815M17 whenmore » compared with conventional heat treatment. Scanning electron microscopic (SEM) analysis of the fracture surface indicates the presence of dimples and flat fracture regions are more common in SCT specimens than for CHT and DCT-processed material.« less

Authors:
 [1];  [2];  [2];  [2];  [3]
  1. Department of Mechanical Engineering, Anna University, Sardar Patel Road, Chennai-600 025 (India). E-mail: benzlee@annauniv.edu
  2. Department of Mechanical Engineering, Anna University, Sardar Patel Road, Chennai-600 025 (India)
  3. Department of Production Engineering, Madras Institute of Technology, Chrompet, Anna University, Chennai-600 044 (India)
Publication Date:
OSTI Identifier:
21003558
Resource Type:
Journal Article
Resource Relation:
Journal Name: Materials Characterization; Journal Volume: 58; Journal Issue: 5; Other Information: DOI: 10.1016/j.matchar.2006.06.019; PII: S1044-5803(06)00214-2; Copyright (c) 2006 Elsevier Science B.V., Amsterdam, The Netherlands, All rights reserved; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; AUSTENITE; CARBIDES; FATIGUE; FRACTURES; GEARS; HEAT TREATMENTS; MARTENSITE; MATERIALS TESTING; SCANNING ELECTRON MICROSCOPY; STEELS; TENSILE PROPERTIES

Citation Formats

Bensely, A., Senthilkumar, D., Mohan Lal, D., Nagarajan, G., and Rajadurai, A. Effect of cryogenic treatment on tensile behavior of case carburized steel-815M17. United States: N. p., 2007. Web. doi:10.1016/j.matchar.2006.06.019.
Bensely, A., Senthilkumar, D., Mohan Lal, D., Nagarajan, G., & Rajadurai, A. Effect of cryogenic treatment on tensile behavior of case carburized steel-815M17. United States. doi:10.1016/j.matchar.2006.06.019.
Bensely, A., Senthilkumar, D., Mohan Lal, D., Nagarajan, G., and Rajadurai, A. Tue . "Effect of cryogenic treatment on tensile behavior of case carburized steel-815M17". United States. doi:10.1016/j.matchar.2006.06.019.
@article{osti_21003558,
title = {Effect of cryogenic treatment on tensile behavior of case carburized steel-815M17},
author = {Bensely, A. and Senthilkumar, D. and Mohan Lal, D. and Nagarajan, G. and Rajadurai, A.},
abstractNote = {The crown wheel and pinion represent the most highly stressed parts of a heavy vehicle; these are typically made of 815M17 steel. The reasons for the frequent failure of these components are due to tooth bending impact, wear and fatigue. The modern processes employed to produce these as high, durable components include cryogenic treatment as well as conventional heat treatment. It helps to convert retained austenite into martensite as well as promote carbide precipitation. This paper deals with the influence of cryogenic treatment on the tensile behavior of case carburized steel 815M17. The impetus for studying the tensile properties of gear steels is to ensure that steels used in gears have sufficient tensile strength to prevent failure when gears are subjected to tensile or fatigue loads, and to provide basic design information on the strength of 815M17 steel. A comparative study on the effects of deep cryogenic treatment (DCT), shallow cryogenic treatment (SCT) and conventional heat treatment (CHT) was made by means of tension testing. This test was conducted as per ASTM standard designation E 8M. The present results confirm that the tensile behavior is marginally reduced after cryogenic treatment (i.e. both shallow and deep cryogenic treatment) for 815M17 when compared with conventional heat treatment. Scanning electron microscopic (SEM) analysis of the fracture surface indicates the presence of dimples and flat fracture regions are more common in SCT specimens than for CHT and DCT-processed material.},
doi = {10.1016/j.matchar.2006.06.019},
journal = {Materials Characterization},
number = 5,
volume = 58,
place = {United States},
year = {Tue May 15 00:00:00 EDT 2007},
month = {Tue May 15 00:00:00 EDT 2007}
}
  • Cited by 5
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  • Systematic experiments were conducted on carburized 4320 steel to study thermal-induced transformation of austenite to bainite by measuring the volumetric transformation strains, up to about 210 C, thermal-induced transformation involved a diffusion-controlled reaction and therefore was time dependent. The mechanism is similar to that describe by the second stage of tempering. An Arhennius-type relation was used to model the kinetics of the reaction leading to a volume increase. A positive hydrostatic stress tended to increase the rate of transformation. The anisotropy of the transformation strains were proportional to the deviatoric stress.
  • The influence of the amount of retained austenite on short fatigue crack growth and wear resistance in carburized SAE 8620 steel was studied in this article. Different amounts of retained austenite in the microstructure of the carburized case were obtained through different heat treatment routes applied after the carburizing process. The wear tests were carried out using pin on disk equipment. After every 200 turns the weight loss was registered. Four point bend fatigue tests were carried out at room temperature, using three different levels of stress and R = 0.1. Crack length versus number of cycles and crack growthmore » rate versus mean crack length curves were analyzed. In both tests the results showed that the test pieces with higher levels of retained austenite in the carburized case exhibited longer fatigue life and better wear resistance.« less
  • The effects of aging temperature on the microstructural evolution and the tensile behavior of precipitation hardened martensitic steel were investigated. Microscopic analysis using transmission electron microscope (TEM) was combined with the microstructural analysis using the synchrotron X-ray diffraction (XRD) to characterize the microstructural evolution with aging temperature. Peak hardness was obtained by precipitation of the Ni{sub 3}Al ordered phase. After aging at temperature range from 420 to 590 °C, spherical Ni{sub 3}Al precipitates and ellipsoidal M{sub 23}C{sub 6} carbides were observed within laths and at lath boundaries, respectively. Strain hardening behavior was analyzed with Ludwik equation. It is observed thatmore » the plastic strain regimes can be divided into two different stages by a rapid increase in strain hardening followed by a comparatively lower increase. At the first strain hardening stage, the aged specimen exhibited higher strain hardening exponent than the as-quenched specimen, and the exponent in the aged specimen was not changed considerably with increasing aging temperature. It is revealed that the strain hardening exponents at the first and the second stages were associated with the Ni{sub 3}Al precipitates and the domain size representing the coherent scattering area, respectively. - Highlights: • All of aged specimen exhibited higher strain hardening exponent than the as-quenched specimen at the first stage. • The value of strain hardening exponent in the aged specimen was nearly constant with aging temperature. • Ni{sub 3}Al precipitation dominantly influenced to the increase of strain hardening exponent at the first strain hardening stage. • Domain size was associated with strain hardening exponent at the second strain hardening stage.« less