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Tensile properties of quenched and tempered martensitic alloys EP-823, HT-9, and 422 were evaluated at temperatures ranging from ambient to 600 °C as a function of three different tempering times. The results indicated that the yield strength, ultimate tensile strength, and the failure strength were gradually reduced with increasing temperature. The ductility parameters were enhanced at elevated temperatures due to increased plastic flow. However, the tempering time did not significantly influence these properties. The evaluation of the fracture surfaces by scanning electron microscopy revealed reduced cracking and dimpled microstructures, indicating enhanced ductility at higher testing temperatures.


Elevated temperatures; High temperatures; Martensite; Martensitic alloys; Scanning electron microscopy; Steel alloys – Fatigue; Steel alloys – Fracture; Steel alloys – Plastic properties; Tensile properties


Materials Science and Engineering | Mechanical Engineering | Mechanics of Materials | Metallurgy


Copyright 2005 ASM International. This paper was published in Journal of Materials Engineering and Performance, Vol. 14, Issue 2, pp. 212-218 and is made available as an electronic reprint with the permission of ASM International. One print or electronic copy may be made for personal use only. Systematic or multiple reproduction, distribution to multiple locations via electronic or other means, duplications of any material in this paper for a fee or for commercial purposes, or modification of the content of this paper are prohibited.

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