Effects of tempering on microstructure and hardness of mo-containing 25wt%Cr-2.4wt%C white cast irons
The nature of carbide precipitation during destabilisation and tempering treatments and its effects on microstructure and hardness of 25wt％Cr and 25wt％Cr-0.7vt％Mo irons has been studied. As-cast specimens were destabilised at 1000 ℃ for 4 hours, followed by forced air cooling to room temperature. The destabilised and air hardened specimens were tempered at temperatures of 350-600℃ for 4 hours. Microstructures were studied using XRD. OM. SEM and TEM. It was found that Mo addition may suppress the retained austenite during destabilisation heat treatment of the 25wt％Cr-2.4wt％C iron. Secondary hardening can be obtained for the Mo-containing 25wt％Cr-2.4vt％C iron by tempering at 350-500 C after destabilisation heat treatment. The maximum hardness of about 700 HV30 was obtained by tempering at 450 ℃. On the other hand, tempering at higher temperature range of 550-600 ℃ can reduce the hardness down to that obtained in the as-cast condition or lower.
high chromium cast iron destabilisation tempering microstructure hardness
Amporn Wiengmoon John T.H. Pearce Suttawan Imurai Torranin Chairuangsri
Department of Physics, Faculty of Science, Naresuan University, Phitsanulok, Thailand. 65000 National Metals & Materials Technology Centre, Patumthani, Thailand. 12120 Department of Physics,Faculty of Science, Chiang Mai University, Chiang Mai, Thailand,50200 Department of Industrial Chemistry,Faculty of Science, Chiang Mai University,Chiang Mai, Thailand, 5
国际会议
北京
英文
99-104
2012-10-23（万方平台首次上网日期，不代表论文的发表时间）