Effects of heat treatment and chemical composition on microstructure and mechanical properties of hadfield steels

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2003

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Alyaz, Serhat

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The aim of this thesis is to investigate the effects of Mn content and alloying additions such as Cr and Mo, and various heat treatment procedures on both microstructure and mechanical properties of austenitic manganese (Hadfield) steels. For this purpose, steels with two different Mn content were considered (12-14 Mn, 16-18 Mn). First, five different heat treatment procedures were applied to the as-cast 12-14 Mn specimens to decide the procedure resulting the optimum tensile properties. Then, the specimens having various amounts of Mn, Cr and Mo were cast and heat-treated to investigate the effect of alloy modifications on austenitic manganese steels. Optical and scanning electron microscopies were used for microstructural investigation. To determine the mechanical properties, tensile tests and hardness tests were carried out. In addition to correlation between microstructure and mechanical properties, ultrasonic velocity measurements were also done. The results show that both composition and heat treatment affect the performance of hadfield steels extensively, and these changes also affect the propogation velocity of the ultrasonic waves.

Subject Keywords

Manganese steel, Austenitic manganese steel, Mechanical property, Ultrasound velocity

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http://etd.lib.metu.edu.tr/upload/2/776526/index.pdf
https://hdl.handle.net/11511/13551

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Graduate School of Natural and Applied Sciences, Thesis

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Citation Formats

S. Alyaz, “Effects of heat treatment and chemical composition on microstructure and mechanical properties of hadfield steels,” M.S. - Master of Science, Middle East Technical University, 2003.