Effect of low-temperature surface hardening by carburization on the fatigue behavior of AISI 316L austenitic stainless steel

Yawei Peng, Zhe Liu, Chaoming Chen, Jianming Gong, Marcel A. J. Somers

Research output: Contribution to journalJournal articleResearchpeer-review

Abstract

The influence of low-temperature gaseous carburization on the fatigue behavior of AISI 316 L austenitic stainless steel was investigated. Tension-compression axial fatigue tests were performed under ambient conditions on untreated and carburized AISI 316 L. The results show that the carburized AISI 316 L has a 22% higher endurance limit compared to untreated AISI 316 L. Fractography investigations with scanning electron microscope (SEM) reveal that for the untreated AISI 316 L fatigue cracks initiate at the surface regardless of the applied stress level. For the carburized AISI 316 L fatigue cracks initiate at the surface for relatively high-level stresses; for relatively low-level stresses fatigue cracks initiate at inclusions beyond the carburized case. After carburization, the ductility in the outmost 10 μm of the carburized case has significantly reduced, leading to micro-crack occurrence during fatigue tests and associated relaxation of compressive residual stress in this region. Beyond this surface-adjacent region, no evident stress relaxation occurs due to the enhanced yield strength of the carburized case. The enhanced fatigue performance is mainly ascribed to the compressive residual compressive stress profile introduced by the carbon-concentration profile over the case. Moreover, solid solution strengthening by interstitially dissolved carbon contributes to improve the fatigue performance.
Original languageEnglish
Article number138524
JournalMaterials Science and Engineering A
Volume769
Number of pages9
ISSN0921-5093
DOIs
Publication statusPublished - 2020

Keywords

  • Austenitic stainless steel
  • Low-temperature carburization
  • Fatigue behavior
  • Residual stress relaxation

Cite this

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title = "Effect of low-temperature surface hardening by carburization on the fatigue behavior of AISI 316L austenitic stainless steel",
abstract = "The influence of low-temperature gaseous carburization on the fatigue behavior of AISI 316 L austenitic stainless steel was investigated. Tension-compression axial fatigue tests were performed under ambient conditions on untreated and carburized AISI 316 L. The results show that the carburized AISI 316 L has a 22{\%} higher endurance limit compared to untreated AISI 316 L. Fractography investigations with scanning electron microscope (SEM) reveal that for the untreated AISI 316 L fatigue cracks initiate at the surface regardless of the applied stress level. For the carburized AISI 316 L fatigue cracks initiate at the surface for relatively high-level stresses; for relatively low-level stresses fatigue cracks initiate at inclusions beyond the carburized case. After carburization, the ductility in the outmost 10 μm of the carburized case has significantly reduced, leading to micro-crack occurrence during fatigue tests and associated relaxation of compressive residual stress in this region. Beyond this surface-adjacent region, no evident stress relaxation occurs due to the enhanced yield strength of the carburized case. The enhanced fatigue performance is mainly ascribed to the compressive residual compressive stress profile introduced by the carbon-concentration profile over the case. Moreover, solid solution strengthening by interstitially dissolved carbon contributes to improve the fatigue performance.",
keywords = "Austenitic stainless steel, Low-temperature carburization, Fatigue behavior, Residual stress relaxation",
author = "Yawei Peng and Zhe Liu and Chaoming Chen and Jianming Gong and Somers, {Marcel A. J.}",
year = "2020",
doi = "10.1016/j.msea.2019.138524",
language = "English",
volume = "769",
journal = "Materials Science and Engineering: A - Structural Materials: Properties, Microstructure and Processing",
issn = "0921-5093",
publisher = "Elsevier",

}

Effect of low-temperature surface hardening by carburization on the fatigue behavior of AISI 316L austenitic stainless steel. / Peng, Yawei; Liu, Zhe; Chen, Chaoming; Gong, Jianming; Somers, Marcel A. J.

In: Materials Science and Engineering A, Vol. 769, 138524, 2020.

Research output: Contribution to journalJournal articleResearchpeer-review

TY - JOUR

T1 - Effect of low-temperature surface hardening by carburization on the fatigue behavior of AISI 316L austenitic stainless steel

AU - Peng, Yawei

AU - Liu, Zhe

AU - Chen, Chaoming

AU - Gong, Jianming

AU - Somers, Marcel A. J.

PY - 2020

Y1 - 2020

N2 - The influence of low-temperature gaseous carburization on the fatigue behavior of AISI 316 L austenitic stainless steel was investigated. Tension-compression axial fatigue tests were performed under ambient conditions on untreated and carburized AISI 316 L. The results show that the carburized AISI 316 L has a 22% higher endurance limit compared to untreated AISI 316 L. Fractography investigations with scanning electron microscope (SEM) reveal that for the untreated AISI 316 L fatigue cracks initiate at the surface regardless of the applied stress level. For the carburized AISI 316 L fatigue cracks initiate at the surface for relatively high-level stresses; for relatively low-level stresses fatigue cracks initiate at inclusions beyond the carburized case. After carburization, the ductility in the outmost 10 μm of the carburized case has significantly reduced, leading to micro-crack occurrence during fatigue tests and associated relaxation of compressive residual stress in this region. Beyond this surface-adjacent region, no evident stress relaxation occurs due to the enhanced yield strength of the carburized case. The enhanced fatigue performance is mainly ascribed to the compressive residual compressive stress profile introduced by the carbon-concentration profile over the case. Moreover, solid solution strengthening by interstitially dissolved carbon contributes to improve the fatigue performance.

AB - The influence of low-temperature gaseous carburization on the fatigue behavior of AISI 316 L austenitic stainless steel was investigated. Tension-compression axial fatigue tests were performed under ambient conditions on untreated and carburized AISI 316 L. The results show that the carburized AISI 316 L has a 22% higher endurance limit compared to untreated AISI 316 L. Fractography investigations with scanning electron microscope (SEM) reveal that for the untreated AISI 316 L fatigue cracks initiate at the surface regardless of the applied stress level. For the carburized AISI 316 L fatigue cracks initiate at the surface for relatively high-level stresses; for relatively low-level stresses fatigue cracks initiate at inclusions beyond the carburized case. After carburization, the ductility in the outmost 10 μm of the carburized case has significantly reduced, leading to micro-crack occurrence during fatigue tests and associated relaxation of compressive residual stress in this region. Beyond this surface-adjacent region, no evident stress relaxation occurs due to the enhanced yield strength of the carburized case. The enhanced fatigue performance is mainly ascribed to the compressive residual compressive stress profile introduced by the carbon-concentration profile over the case. Moreover, solid solution strengthening by interstitially dissolved carbon contributes to improve the fatigue performance.

KW - Austenitic stainless steel

KW - Low-temperature carburization

KW - Fatigue behavior

KW - Residual stress relaxation

U2 - 10.1016/j.msea.2019.138524

DO - 10.1016/j.msea.2019.138524

M3 - Journal article

VL - 769

JO - Materials Science and Engineering: A - Structural Materials: Properties, Microstructure and Processing

JF - Materials Science and Engineering: A - Structural Materials: Properties, Microstructure and Processing

SN - 0921-5093

M1 - 138524

ER -