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Microstructures and Mechanical Properties of Austempering SUS440 Steel Thin Plates

Department of Materials Science and Engineering, National Cheng Kung University, Tainan 701, Taiwan
Author to whom correspondence should be addressed.
Academic Editor: Hugo F. Lopez
Metals 2016, 6(2), 35;
Received: 30 November 2015 / Revised: 11 January 2016 / Accepted: 30 January 2016 / Published: 15 February 2016
SUS440 is a high-carbon stainless steel, and its martensite matrix has high heat resistance, high corrosion resistance, and high pressure resistance. It has been widely used in mechanical parts and critical materials. However, the SUS440 martempered matrix has reliability problems in thin plate applications and thus research uses different austempering heat treatments (tempering temperature: 200 °C–400 °C) to obtain a matrix containing bainite, retained austenite, martensite, and the M7C3 phase to investigate the relationships between the resulting microstructure and tensile mechanical properties. Experimental data showed that the austempering conditions of the specimen affected the volume fraction of phases and distribution of carbides. After austenitizing heat treatment (1080 °C for 30 min), the austempering of the SUS440 thin plates was carried out at a salt-bath temperature 300 °C for 120 min and water quenching was then used to obtain the bainite matrix with fine carbides, with the resulting material having a higher tensile fracture strength and average hardness (HRA 76) makes it suitable for use as a high-strength thin plate for industrial applications. View Full-Text
Keywords: stainless steel; austempering; bainite; mechanical properties stainless steel; austempering; bainite; mechanical properties
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Chen, C.-Y.; Hung, F.-Y.; Lui, T.-S.; Chen, L.-H. Microstructures and Mechanical Properties of Austempering SUS440 Steel Thin Plates. Metals 2016, 6, 35.

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