Investigation of microstructures and properties of 440C martensitic stainless steel

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Abstract

440C steel is a high-carbon martensitic stainless steel with excellent mechanical properties. This paper describes the effect of heat treatments on microstructures and mechanical properties of 440C steel. Solution treatment was carried out at 1150°C and 60 minutes holding, followed by tempering process at 660°C with various holding time. In the as-quenched sample, SEM and EDX revealed existence of M7C3 carbides within the martensitic structures. While after tempering, M23C6 carbides were identified along with M7C3 carbides. Hardness tests found out that tempering at 30 minutes resulted in maximum hardness value of 49HRC. However, the hardness of the as-quenched sample was 43HRC. Tensile tests at this tempering time showed YS of 368MPa and UTS of 1044MPa. As comparison, the as-quenched sample showed YS of 124MPa and UTS of 517MPa. It is believed that secondary hardening phenomenon occurred while tempering and influenced the value of hardness and tensile strength of the 440C steel.

Original languageEnglish
Pages (from-to)123-126
Number of pages4
JournalInternational Journal of Mechanical and Materials Engineering
Volume4
Issue number2
Publication statusPublished - 2009

Fingerprint

Martensitic stainless steel
Tempering
Steel
Microstructure
Hardness
Carbides
Mechanical properties
Hardening
Energy dispersive spectroscopy
Tensile strength
Carbon
Heat treatment
Scanning electron microscopy

Keywords

  • Hardness
  • Microstructures
  • Secondary hardening
  • Tempering

ASJC Scopus subject areas

  • Mechanical Engineering
  • Mechanics of Materials
  • Materials Science(all)

Cite this

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title = "Investigation of microstructures and properties of 440C martensitic stainless steel",
abstract = "440C steel is a high-carbon martensitic stainless steel with excellent mechanical properties. This paper describes the effect of heat treatments on microstructures and mechanical properties of 440C steel. Solution treatment was carried out at 1150°C and 60 minutes holding, followed by tempering process at 660°C with various holding time. In the as-quenched sample, SEM and EDX revealed existence of M7C3 carbides within the martensitic structures. While after tempering, M23C6 carbides were identified along with M7C3 carbides. Hardness tests found out that tempering at 30 minutes resulted in maximum hardness value of 49HRC. However, the hardness of the as-quenched sample was 43HRC. Tensile tests at this tempering time showed YS of 368MPa and UTS of 1044MPa. As comparison, the as-quenched sample showed YS of 124MPa and UTS of 517MPa. It is believed that secondary hardening phenomenon occurred while tempering and influenced the value of hardness and tensile strength of the 440C steel.",
keywords = "Hardness, Microstructures, Secondary hardening, Tempering",
author = "Salleh, {S. H.} and Omar, {Mohd. Zaidi} and J. Syarif and Ghazali, {Mariyam Jameelah} and Shahrum Abdullah and Zainuddin Sajuri",
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T1 - Investigation of microstructures and properties of 440C martensitic stainless steel

AU - Salleh, S. H.

AU - Omar, Mohd. Zaidi

AU - Syarif, J.

AU - Ghazali, Mariyam Jameelah

AU - Abdullah, Shahrum

AU - Sajuri, Zainuddin

PY - 2009

Y1 - 2009

N2 - 440C steel is a high-carbon martensitic stainless steel with excellent mechanical properties. This paper describes the effect of heat treatments on microstructures and mechanical properties of 440C steel. Solution treatment was carried out at 1150°C and 60 minutes holding, followed by tempering process at 660°C with various holding time. In the as-quenched sample, SEM and EDX revealed existence of M7C3 carbides within the martensitic structures. While after tempering, M23C6 carbides were identified along with M7C3 carbides. Hardness tests found out that tempering at 30 minutes resulted in maximum hardness value of 49HRC. However, the hardness of the as-quenched sample was 43HRC. Tensile tests at this tempering time showed YS of 368MPa and UTS of 1044MPa. As comparison, the as-quenched sample showed YS of 124MPa and UTS of 517MPa. It is believed that secondary hardening phenomenon occurred while tempering and influenced the value of hardness and tensile strength of the 440C steel.

AB - 440C steel is a high-carbon martensitic stainless steel with excellent mechanical properties. This paper describes the effect of heat treatments on microstructures and mechanical properties of 440C steel. Solution treatment was carried out at 1150°C and 60 minutes holding, followed by tempering process at 660°C with various holding time. In the as-quenched sample, SEM and EDX revealed existence of M7C3 carbides within the martensitic structures. While after tempering, M23C6 carbides were identified along with M7C3 carbides. Hardness tests found out that tempering at 30 minutes resulted in maximum hardness value of 49HRC. However, the hardness of the as-quenched sample was 43HRC. Tensile tests at this tempering time showed YS of 368MPa and UTS of 1044MPa. As comparison, the as-quenched sample showed YS of 124MPa and UTS of 517MPa. It is believed that secondary hardening phenomenon occurred while tempering and influenced the value of hardness and tensile strength of the 440C steel.

KW - Hardness

KW - Microstructures

KW - Secondary hardening

KW - Tempering

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