An investigation on the microstructure and mechanical properties of quenched and tempered SS440C martensitic stainless steel

A. A. Salih, Mohd. Zaidi Omar, J. Syarif, Zainuddin Sajuri

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Abstract

440C steel is a high- carbon martensitic stainless steel with excellent mechanical properties. This paper describes the relative effect of various austenitizing temperature and tempering temperature on the microstructure and mechanical properties of 440C martensitic stainless steel. Solution treatment was carried out at 1150°C for 1 hr, followed by reheat at 1100°C and 30 minute holding. Then, tempered at various temperatures for 1 hr. In the As-quenched sample the microstructure contains undissolved carbide M 7C 3 with retained austenite in a matrix of un-tempered martensite while as the austenitizing temperature increase, the size of the austenite grain also increases with decrease in the mechanical properties. Hardness test found out that tempering at 500°C resulted in maximum hardness value of 564HV. However, the hardness of the as-quenched sample was 765HV. Tensile test at 500°C tempering temperature showed Y.S of 2100MPa and UTS of 2178MPa. As comparison, the as-quenched sample showed Y.S of 1300MPa and UTS 1507MPa. It is believed that secondary hardening phenomenon occurred while tempering and influence the value of hardness and tensile strength of the 440C steel.

Original languageEnglish
Pages (from-to)119-123
Number of pages5
JournalInternational Journal of Mechanical and Materials Engineering
Volume7
Issue number2
Publication statusPublished - 2012

Fingerprint

Martensitic stainless steel
Tempering
Mechanical properties
Microstructure
Hardness
Steel
Austenite
Temperature
Martensite
Carbides
Hardening
Tensile strength
Carbon

Keywords

  • 440C
  • Hardness
  • Tempered martensite
  • Tempering

ASJC Scopus subject areas

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

Cite this

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abstract = "440C steel is a high- carbon martensitic stainless steel with excellent mechanical properties. This paper describes the relative effect of various austenitizing temperature and tempering temperature on the microstructure and mechanical properties of 440C martensitic stainless steel. Solution treatment was carried out at 1150°C for 1 hr, followed by reheat at 1100°C and 30 minute holding. Then, tempered at various temperatures for 1 hr. In the As-quenched sample the microstructure contains undissolved carbide M 7C 3 with retained austenite in a matrix of un-tempered martensite while as the austenitizing temperature increase, the size of the austenite grain also increases with decrease in the mechanical properties. Hardness test found out that tempering at 500°C resulted in maximum hardness value of 564HV. However, the hardness of the as-quenched sample was 765HV. Tensile test at 500°C tempering temperature showed Y.S of 2100MPa and UTS of 2178MPa. As comparison, the as-quenched sample showed Y.S of 1300MPa and UTS 1507MPa. It is believed that secondary hardening phenomenon occurred while tempering and influence the value of hardness and tensile strength of the 440C steel.",
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AU - Salih, A. A.

AU - Omar, Mohd. Zaidi

AU - Syarif, J.

AU - Sajuri, Zainuddin

PY - 2012

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N2 - 440C steel is a high- carbon martensitic stainless steel with excellent mechanical properties. This paper describes the relative effect of various austenitizing temperature and tempering temperature on the microstructure and mechanical properties of 440C martensitic stainless steel. Solution treatment was carried out at 1150°C for 1 hr, followed by reheat at 1100°C and 30 minute holding. Then, tempered at various temperatures for 1 hr. In the As-quenched sample the microstructure contains undissolved carbide M 7C 3 with retained austenite in a matrix of un-tempered martensite while as the austenitizing temperature increase, the size of the austenite grain also increases with decrease in the mechanical properties. Hardness test found out that tempering at 500°C resulted in maximum hardness value of 564HV. However, the hardness of the as-quenched sample was 765HV. Tensile test at 500°C tempering temperature showed Y.S of 2100MPa and UTS of 2178MPa. As comparison, the as-quenched sample showed Y.S of 1300MPa and UTS 1507MPa. It is believed that secondary hardening phenomenon occurred while tempering and influence 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 relative effect of various austenitizing temperature and tempering temperature on the microstructure and mechanical properties of 440C martensitic stainless steel. Solution treatment was carried out at 1150°C for 1 hr, followed by reheat at 1100°C and 30 minute holding. Then, tempered at various temperatures for 1 hr. In the As-quenched sample the microstructure contains undissolved carbide M 7C 3 with retained austenite in a matrix of un-tempered martensite while as the austenitizing temperature increase, the size of the austenite grain also increases with decrease in the mechanical properties. Hardness test found out that tempering at 500°C resulted in maximum hardness value of 564HV. However, the hardness of the as-quenched sample was 765HV. Tensile test at 500°C tempering temperature showed Y.S of 2100MPa and UTS of 2178MPa. As comparison, the as-quenched sample showed Y.S of 1300MPa and UTS 1507MPa. It is believed that secondary hardening phenomenon occurred while tempering and influence the value of hardness and tensile strength of the 440C steel.

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KW - Tempering

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