机械能助渗铝工艺与渗层性能研究  

Aluminizing Process Aided by Mechanical Energy and Properties of Aluminized Case

作　　者：王吉会[1] 张兴华[1] 张跃[1] 

机构地区：[1]天津大学材料科学与工程学院,天津300072

出　　处：《热处理》2010年第6期22-25,共4页Heat Treatment

摘　　要：研究了机械能助渗铝的温度、时间和活性剂含量对渗铝层形貌、厚度、结构、硬度和耐蚀性等性能的影响,并与传统的粉末渗铝进行了比较。试验结果表明,机械能助渗铝层表面呈颗粒状,渗铝层由Fe2Al5相和少量的Fe3Al相组成,硬度达988 HV。在400~700℃、2~4 h的范围内机械能助渗铝,渗层厚度随渗铝温度的升高和渗铝时间的延长而明显增大。渗铝层的耐蚀性随渗铝温度的升高而提高,但随渗铝时间的延长呈现出先提高后降低的趋势,由600℃、3 h工艺获得的渗铝层的耐蚀性最好。采用机械能助渗铝工艺,尤其是较低温度（450~650℃）和较短时间（2.5~4.5 h）获得的渗层的厚度明显大于传统的粉末渗铝层。The surface morphology,thickness,structure,hardness and corrosion resistance of mechanical energy aided aluminized case which was prepared by different aluminizing temperatures,times at temperatures and activator contents were investigated,and compared with that of aluminized case prepared by a powder procedure.The results show that mechanical energy aided aluminized case presents a granular pattern and consists of Fe2Al5 phase and a small amount of Fe3Al phase,with its hardness being as high as 988 HV.The thickness of mechanical energy aided aluminized case will increase with the rise of aluminizing temperature or the prolongation of time at temperature in the range of 400 to 700 ℃ or 2 to 4 h.The corrosion resistance of aluminized case will enhance with the rise of aluminizing temperature,but will firstly increase then decrease with the prolongation of aluminizing time.The aluminized case prepared by aluminizing at 600 ℃ for 3 h has the best corrosion resistance.The aluminized case prepared by the mechanical energy aided aluminizing techniques,especially at lower temperature of 450 to 650 ℃ and shorter time of 2.5 to 4.5 h,will be obviously thicker than aluminized case prepared by conventional powder aluminizing method.

关 键 词：机械能助渗铝 粉末渗铝 组织 性能 

分 类 号：TG156.86[金属学及工艺—热处理]