Effects of cryogenic treatment on microstructure and wear resistance of Fe-0.35C-6.3Cr martensitic steel

Masoud Sehri, Hamid Ghayour, Kamran Amini, Masaab Naseri, Habib Rastegari, Vahid Javaeri

Abstract


The study is conducted to determine the effect of quenching and tempering processes on microstructural evolutions and abrasive properties of medium carbon-high chromium steel. For this purpose, Austenitizing was performed at the temperatures of 1000 °C for 15 min followed by oil quenching. To determine the optimum tempering temperature, tempering temperatures were selected in the temperature ranges of 350-600 °C. The samples cryogenically treated immediately after quenching in liquid nitrogen (-196 °C) for 24 hrs. Dry sand/rubber wheel test were used to evaluate the wear resistance properties. Microstructural observation, fractography and retain austeninte was evaluated by optical and scanning electron microscopy and X-ray diffraction analysis. The results show that the best wear resistance can be obtained at the tempering temperature of 500°C, due to the reduction of tendency to micro-cracking, decrease in internal stresses and improvement of impact energy. . Observation of the worn surfaces revealed that the wear mechanisms after tempering at 450°C are combination of abrasive, adhesive and fatigue wear. However, abrasive wear is the only active wear mechanism for specimen tempered at 500 °C. In addition, wear resistance of deep cryogenically treated sample was significantly increased (about 25%) by the removal of retained austenite and formation of uniform fine carbides distribution in the matrix.

Keywords


Heat treatment, Deep cryogenic, Microstructure, Wear resistant, Martensitic steel

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DOI: http://dx.doi.org/10.12776/ams.v24i2.1037

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