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《Acta Metallurgica Sinica》 2014-04
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EFFECT OF TEMPERING TEMPERATURE ON CARBIDE AND MECHANICAL PROPERTIES IN A Fe-Cr-Ni-Mo HIGH-STRENGTH STEEL

WEN Tao;HU Xiaofeng;SONG Yuanyuan;YAN Desheng;RONG Lijian;Institute of Metal Research,Chinese Academy of Sciences;  
The variation of carbides with tempering temperature in a Fe-Cr-Ni-Mo high-strength steel and their effect on mechanical properties are investigated by means of TEM and three-dimensional atom probe(3DAP).The results show that there mainly appear M3C and M7C3when tempering temperature is rather low(400 ℃),the former is thick with a length of about 1 μm and the latter is fine and the length is less than 200 nm,and M is composed of Fe,Cr and Mn.Tempering at 500 and 600 ℃,the amount of carbide increases gradually,and there appear M2C and M6C types of carbide which are both less than 200 nm in length,simultaneously M3C becoming fine or disappear.When tempering temperature further increases to 650 ℃,besides M2C there also appears MC type of carbide.The size of both M2C and MC are less than 100 nm,meanwhile the amount of carbide decreases.The M of M2C,M6C and MC is a combination mainly of Cr,Mo and V.The strength of the Fe-Cr-Ni-Mo high-strength steel gradually reduces with increasing tempering temperature,but the downtrend of strength is rather small when tempering temperature is in the range of 500~600 ℃,owing to secondary hardening induced by the appearance of Vcarbide.In short,the high-strength steel could obtain better combination of strength and impact toughness after tempering at about 530~600 ℃.
【Fund】: 国家自然科学基金重大研究计划资助项目91226204~~
【CateGory Index】: TG156.5
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