A study of microstructure and properties of cast Fe-10Cr-1.5B alloy  

作　　者：Zhang Haibin Cen Qihong Fu Hanguang Lei Yongping Xing Jiandong 

机构地区：[1]School of Materials Science and Engineering, Beijing University of Technology [2]School of Materials Science and Engineering, National Engineering Research Center of Waste Resource Recovery, Kunming University of Science and Technology [3]State Key Laboratory for Mechanical Behavior of Materials, Xi’an Jiaotong University

出　　处：《China Foundry》2014年第3期185-190,共6页中国铸造（英文版）

基　　金：financially supported by the State Key Laboratory for Mechanical Behavior of Materials(No.20131302);the National Natural Science Foundation of China(Nos.51274016 and 51171073)

摘　　要：In the present study, the microstructure and mechanical properties of cast Fe-10Cr-1.5B（FCB） alloy after different heat treatments were studied. The results showed that the as-cast microstructure of FCB alloy consists of α-Fe, M（M=Cr, Fe, Mn）2（B, C） and M（M=Cr, Fe, Mn）7（C, B）3 type borocarbides, and small amounts of pearlite and austenite. After oil quenching treatment, metal matrix transformed into the martensite from the mixture of martensite, pearlite and austenite. There are many M（M=Cr,Fe,Mn）23（C,B）6 type borocarbide precipitates in the metal matrix, and eutectic borocarbide appears with an apparent disconnection and isolated phenomenon. When the quenching temperature reaches 1,050℃, the hardness of FCB alloy is the highest, but the change of quenching temperature has no obvious effect on impact toughness of FCB alloy. After tempering, the eutectic microstructure of FCB alloy appears with a ＂two links＂ trend. With the increase of tempering temperature, the hardness of FCB alloy decreases gradually and impact toughness increases gradually. Cast FCB alloy oil-quenched from 1,050℃ and tempered from 200℃ has excellent combined properties; its hardness and impact toughness are 61.5 HRC and 8.8 J·cm^-2 respectively.In the present study, the microstructure and mechanical properties of cast Fe-10Cr-1.5B(FCB) alloy after different heat treatments were studied. The results showed that the as-cast microstructure of FCB alloy consists of α-Fe, M(M=Cr, Fe, Mn)2(B, C) and M(M=Cr, Fe, Mn)7(C, B)3 type borocarbides, and small amounts of pearlite and austenite. After oil quenching treatment, metal matrix transformed into the martensite from the mixture of martensite, pearlite and austenite. There are many M(M=Cr,Fe,Mn)23(C,B)6 type borocarbide precipitates in the metal matrix, and eutectic borocarbide appears with an apparent disconnection and isolated phenomenon. When the quenching temperature reaches 1,050 oC, the hardness of FCB alloy is the highest, but the change of quenching temperature has no obvious effect on impact toughness of FCB alloy. After tempering, the eutectic microstructure of FCB alloy appears with a "two links" trend. With the increase of tempering temperature, the hardness of FCB alloy decreases gradually and impact toughness increases gradually. Cast FCB alloy oil-quenched from 1,050 oC and tempered from 200 oC has excellent combined properties; its hardness and impact toughness are 61.5 HRC and 8.8 J?cm-2 respectively.

关 键 词：Fe-Cr-B alloy solidification microstructure heat treatment mechanical property 

分 类 号：TG142.71[一般工业技术—材料科学与工程]