铝合金化超高碳钢的球化工艺研究  

Spheroidizing Process of Ultra-high Carbon Steel with Addition of Al

作　　者：李红娟[1] 王宝奇[1] 宋晓艳[2] 郭素珍[1] 谷南驹[1] 

机构地区：[1]河北工业大学材料学院,天津300132 [2]北京工业大学材料学院,北京100022

出　　处：《金属热处理》2004年第9期46-49,共4页Heat Treatment of Metals

基　　金：河北省教委博士基金 ( 5 3 40 0 3 ) ;河北省自然科学基金项目 ( 5 0 0 0 2 3 )

摘　　要：在超高碳钢 (UHCS)中添加铝 ,利用成分不均匀奥氏体的加热控制 ,可以实现奥氏体在冷却过程中先共析碳化物在基体上弥散析出。这些弥散分布的碳化物颗粒在共析转变前的等温过程中长大 ,其尺寸由等温时间和等温温度控制。随后进行淬火和高温回火处理 ,得到了理想的球化组织。新的球化工艺为 870℃透烧 ,在 780℃等温保持 1 5h淬火 ,然后 6 5 0℃× 2h回火。该工艺与普通等温球化工艺相比 。The pro-eutectoid carbide particles precipitated dispersedly in the matrix during cooling from austeniting temperature by means of the addition of Al to ultra-high carbon steel and controlled heating of the austenite with inhomogenous carbon concentration.These fine carbide particles grew during isothermal before the eutectoid transformation and their sizes depended on isothermal time and temperature;the subsequent quenching and high-temperature tempering were followed to obtain good spheroidized microstructure.The steel treated with new spheroidizing technology,870℃ through heating,isothermally holding at 780℃ for 1.5h and quenching then tempering at 650℃ for 2h,achieved high ratio of σ _s/ σ _b than that treated with conventional isothermal spheroidizing technology.

关 键 词：超高碳钢 球化工艺 先共析碳化物 

分 类 号：TG142.3[一般工业技术—材料科学与工程]