The effect of water temperature on the hardness and impact strength of water quenched medium carb... more The effect of water temperature on the hardness and impact strength of water quenched medium carbon steel was investigated. Two medium carbon steel, 0.33 wt % C and 0.42 wt % C, were heated to 900 o C and quenched in water at temperatures ranging from 35 o C (room temperature) to 95 o C. The results showed that hardness was reduced by over 18% and impact strength was improved by over 50%. The hard martensite structure which usually makes quenched steels highly brittle and of low toughness was replaced by tempered martensite structures thereby impacting better mechanical properties in the steel. Water quenching is probably the oldest heat treatment process used by man to harden steel. It can be described as the rapid cooling of metal from the solution treating temperature, usually in the range of 845 o C to 870 o C for steels. Quenching is usually performed in order to prevent ferrite or pearlite precipitation and facilitate the formation of martensite or bainite, [1] . In the harden...
The effect of water temperature on the hardness and impact strength of water quenched medium carb... more The effect of water temperature on the hardness and impact strength of water quenched medium carbon steel was investigated. Two medium carbon steel, 0.33 wt % C and 0.42 wt % C, were heated to 900 o C and quenched in water at temperatures ranging from 35 o C (room temperature) to 95 o C. The results showed that hardness was reduced by over 18% and impact strength was improved by over 50%. The hard martensite structure which usually makes quenched steels highly brittle and of low toughness was replaced by tempered martensite structures thereby impacting better mechanical properties in the steel. Water quenching is probably the oldest heat treatment process used by man to harden steel. It can be described as the rapid cooling of metal from the solution treating temperature, usually in the range of 845 o C to 870 o C for steels. Quenching is usually performed in order to prevent ferrite or pearlite precipitation and facilitate the formation of martensite or bainite, [1] . In the harden...
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