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《Transactions of Materials and Heat Treatment》 2010-05
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Effect of carbide evolution on thermal-stability in Nb-microalloyed hot work steel

CHEN Ying-wei,WU Xiao-chun,SONG Wen-wen,MIN Yong-an(College of Materials Science and Engineering,Shanghai University,Shanghai 200072,China)  
The morphology,size and variation of carbide in Nb-microalloyed hot die steel SDH8Nb were analyzed and its temper resistance was investigated by means of TEM,EDS,3DAP and thermal-stability test.The experimental results show that the thermal-stability of SDH8Nb steel is better than that of H13 steel.In SDH8Nb steel,the carbides are mainly composed of rod carbide Mo2 C after quenching and tempering and some carbides of chromium and vanadium are also observed.Niobium is mainly dissolved in matrix and only a few of Nb carbides is found in SDH8Nb steel after quenching and tempering,contributing to a great solution strengthening.During long time aging at 620℃,NbC carbides depressively precipitate from the matrix in the SDH8Nb steel,improving its thermal stability.
【Fund】: 国家科技支撑计划课题(2007BAE51B04)
【CateGory Index】: TG142.45
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