强流脉冲离子束辐照对316L不锈钢表面改性的实验研究  

EXPERIMENTAL RESEARCH ON THE SURFACE MODIFICATION OF 316L STAINLESS STEEL BY HIGH-INTENSITY PULSED ION BEAM

作　　者：王旭[1] 张俊善[1] 雷明凯[1] 

机构地区：[1]大连理工大学材料科学与工程学院,大连116024

出　　处：《金属学报》2007年第4期393-398,共6页Acta Metallurgica Sinica

基　　金：国家高技术研究发展计划资助项目2003AA305610

摘　　要：利用离子能量为300 keV、束流密度为200 A/cm^2、脉冲宽度为75 ns的混合离子束(70%H^++30%C^+)组成的强流脉冲离子束(HIPIB)对316L不锈钢进行了表面辐照处理,辐照次数分别为1,5,10次．采用SEM,XRD,TEM和EPMA分析辐照后试样表面形貌、表面层相组成和微观结构及元素分布的变化．结果表明,HIPIB辐照使试样表面光滑化,表面层晶粒细化、产生择优取向,杂质元素选择性烧蚀,电化学腐蚀性能明显提高由于HIPIB辐照引起的大应力和冲击波的影响,辐照后在深度达100μm表层内显微硬度提高,表面摩擦系数降低,表面抗磨损性能显著改善．随着辐照次数的增加,316L疲劳极限和蠕变断裂寿命延长,稳态蠕变速率降低．The surface of 316L stainless steel was treated by high-intensity pulsed ion beam （HIPIB） with mixed ion （70%H^＋ ＋30%C^＋） energy E=300 keV, current density J=200 A/cm^2, pulse numbers N=1, 5, 10, pulse duration τ=75 ns. The surface morphologies and phase constitutions in the near surface regions of original and treated specimens were analyzed with SEM, XRD and TEM. EPMA was used to study the distribution of elements on the irradiated specimens. It is found that the HIPIB irradiation can smooth the surface of the targets, reduce the grain size, induce （111） preferred orientation and selective ablation of impurities, which improved obviously the electrochemical corrosion resistance. The microhardness was increased in a depth range of up to 100 μm due to extremely high stresses and shock waves induced by the bombardment, so as to the friction coefficient of the irradiated surfaces was reduced and the wear resistance was improved significantly. HIPIB irradiation prolongates the fatigue limit and creep rupture life of 316L, simultaneity reduces the steady creep rate with increasing the oulse number.

关 键 词：强流脉冲离子束 316L不锈钢 表面改性 

分 类 号：TG142.71[一般工业技术—材料科学与工程]