【摘要】 利用"Nadezhda-2"型强流脉冲电子束装置对1Cr18Ni9Ti不锈钢样品进行不同脉冲次数的电子束轰击处理,采用H-800型透射电子显微镜分别对5次和10次轰击处理的样品进行观察。结果表明,经5次轰击样品中存在板条马氏体组织和形变孪晶组织;经10次轰击样品中存在形变孪晶组织和层错四面体结构。对产生这些显微结构的分析表明,在面心立方结构(111)面内,沿[110]方向的Frank位错圈产生αa→αd+da反应生成层错四面体;在脉冲电子束作用下产生的快速加热和冷却速度是导致面心立方金属产生上述显微结构的主要原因。更多还原

【Abstract】 1Cr18Ni9Ti stainless steel samples were irradiated by high current pulsed electron beam with different numbers of pulses using Nadezhda-2 high current pulse electronic beam device.The samples treated with 5 and 10 shots were observed with H-800 transmission electron microscope respectively.The results show that lath martensite and deformation twins exist in 5 shots samples,and deformation twins and stacking fault tetrahedron appear in 10 shots samples.Inside(111)of fcc metal structure,the Frank dislocation loop generates the reaction of αa→αd+da along direction and form the stacking fault tetrahedron.The rapid heating and cooling caused by pulse electronic beam are the main reason to form the above-mentioned microstructure in fcc metal.更多还原