强磁场下退火温度对Fe-0.36C合金铁素体转变的影响  

Influence of annealing temperature on the ferrite transformation in Fe-0.36C alloy under a high magnetic field

作　　者：王守晶[1] 赵骧[1] 左良[1] 

机构地区：[1]东北大学材料各向异性和织构教育部重点实验室,沈阳110004

出　　处：《材料与冶金学报》2008年第3期192-195,共4页Journal of Materials and Metallurgy

基　　金：国家自然科学基金资助(No:50325102)

摘　　要：采用12T强磁场热处理装置研究了强磁场下不同奥氏体化温度退火对高纯Fe-0.36C合金先共析铁素体组织形貌的影响.结果表明:强磁场能够显著抑制针状铁素体的形成,并使先共析铁素体晶粒沿磁场方向伸长且呈链状排列.这是由于强磁场增加的相变驱动力克服了由界面能和退磁场能构成的相变阻力所致.随奥氏体化温度升高,先共析铁素体晶粒沿磁场方向伸长程度逐渐减弱,针状铁素体面积分数增加,这是由于奥氏体晶粒粗大化而引起的退磁场能的被削弱程度降低所致.The influence of different austenized temperature on the morphology of proeutectoid ferrite in a high purity Fe-0. 36C alloy under a 12T high magnetic field has been studied. It is obvious from research results that high magnetic field could suppress the formation of needle - shaped ferrite, and the proeuteetoid ferrite grains were elongated along the magnetic field direction in a chain alignment. The reason is that the increased phase transformation driving force due to the high magnetic field could overcome the phase transformation resistance foroe of interface energy and demagnetization energy. With the increase of austenized temperature, the elongated degree of proeutectoid ferrlte grain along the magnetic field direction is weakened and the area fraction of needle - shaped ferrite is increased, which is caused by the decrease of the weakened degree of demagnetization energy originated from the austenitie grain coarsening.

关 键 词：强磁场 奥氏体化 铁碳合金 铁素体转变 

分 类 号：TG111.5[金属学及工艺—物理冶金]