催渗剂CeO_2对H13模具钢表面渗铝层组织及性能的影响

Effect of CeO_2 on Microscopic Structure and Properties of H13 Hot Die Steel

采用稀土氧化物CeO2作为催渗剂对H13钢进行粉末渗铝,并在相同条件下制备了未添加催渗剂时的渗铝试样作为对比。分析了渗铝试样的横截面形貌、渗层成分及物相、显微硬度,探讨了催渗剂CeO2的添加量对渗层深度的影响。结果表明:CeO2的添加量不超过0.7%时,随着CeO2添加量的增加,渗层厚度增大,具有明显的催渗作用;添加0.7%的CeO2时,渗层表面硬度较高,这归因于形成的Al5Fe2和AlFe金属间化合物以及CeO2的细晶强化作用。

In this investigation,an pack cementation process was conducted on an H13 steel,CeO2 was energizer.The sample without energizer was prepared and compared.The section microstructure,compositon of aluminized layer phase and microsturctrue of aluminized sample was analyzed and influence of content of CeO2 on deepth of anuminizing layer was discussed.The results show that when the CeO2 recruitment does not surpass 0.7%,along with CeO2 recruitment＇s increase,the thickness increases;When the CeO2 recruitment account for 0.7%,the surface hardness is higher,this attributes to grain refining strenthening of Al5Fe2 and the AlFe intermetallic compound as well as the CeO2.