2012•Heat treatment of metalsRequires access
Effect of tempering temperature on microstructure and impact toughness of WB36 piping steel
Gongye Xiao
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Abstract
Influence of tempering temperature on impact toughness of WB36 steel is investigated.The results of Charpy test show that the impact energy of WB36 steel increases with the tempering temperature increasing,but even the highest value fails to meet the requirements.After a close examination on microstructures and fracture surfaces,it is indicated that the main cause for the unsatisfactory impact energy is the inappropriate cooling rate of normalizing rather than tempering temperature.Therefore,adjusting the normalizing cooling rate for the purpose of obtaining a preferable microstructure is supposed to improve the impact toughness.