稀土催渗对机械研磨316L不锈钢渗铝工艺的影响  

Effect of Rare Earths Elements and Surface Mechanical Activation Treatment on the Aluminizing Process for 316L Stainless Steels

作　　者：宋月鹏[1,2] 刘自平[1] 陈义祥[2] 李江涛[2] 杨增朝[2] 贺刚[2] 凌云汉[3] 

机构地区：[1]山东农业大学机械与电子工程学院,山东泰安271018 [2]中国科学院理化技术研究所,北京100190 [3]清华大学材料学院,北京100084

出　　处：《稀土》2016年第2期107-112,共6页Chinese Rare Earths

基　　金：国际热核聚变实验堆(ITER)计划专项(2013GB110005);山东省自主创新专项(2013CXC90201);山东省现代农业产业技术体系-水果创新团队专项;博士后基金项目(201203101;2013M531636);山东农业大学农业大数据项目(75007)

摘　　要：采用粉末包埋法渗铝,研究了稀土催渗对机械研磨316L不锈钢渗铝工艺的影响,并对渗铝层进行了显微组织及成分分布的研究,结果表明,稀土元素及机械研磨对316L不锈钢渗铝过程有显著的促进作用,当渗铝剂内稀土含量3%-5%,机械研磨时间8 h时,渗铝效果最好,获得的渗铝层组织致密、成分呈梯度变化,硬度提高。并对其作用机制进行了分析研究,机械研磨可使表面晶粒破碎细化,组织结构缺陷增多,大尺寸稀土原子的渗入,又引起表面缺陷密度增殖,铝原子获得更多的扩散通道而起到催渗作用。The aluminized coating on 316 L stainless steels was prepared by pack cementation. The effects of rare earths（RE） elements and surface mechanical activation treatment（SMAT） on the process of aluminizing were studied. Microstructure and components distribution of aluminizing layer were also investigated. The results indicated that RE and SMAT can stimulate the aluminizing process. Optimum parameters were obtained as RE addition in agent with 3% - 5% mass fraction and SMAT for samples with 8 hours. The aluminized layer we obtained is compact and ingredients gradient change and hardness increase. Effect mechanism of RE and SMAT on the aluminizing process was also investigated. The grains on the surface of 316 L stainless steel samples can be broken under the shot peening of grinding balls in the process of SMAT,resulting in more and more defects such as dislocation,grain boundaries and so on. Jumbo size RE atoms can permeate into the matrix following these defects＇ channel,which propagates the defects density. Amount of permeation channels into matrix of aluminium atoms will be formed and the promotion roles of RE and SMAT was so explored.

关 键 词：机械研磨 稀土催渗 渗铝 316L不锈钢 

分 类 号：TG156[金属学及工艺—热处理] TG176[金属学及工艺—金属学]