【作者】 张俊宝； 刘玉亮； 宋洪伟； 吴杰； 史弼； 熊天英；

【Author】 Zhang Junbao Liu yuliang song Hongwei Wu JieShi Bi Xiong Tianying(Baosteel Technology Center,Baoshan Iron & Steel Co. ,Ltd. ,Shanghai,201900) ( Chinese Academy of Sciences,Shenyang, 110016)

【机构】 宝山钢铁股份有限公司技术中心； 中国科学院金属研究所；

【摘要】 利用超音速微粒轰击技术在GCr15钢表面制备了纳米晶表面层。采用TEM和纳米压痕技术等分析了表面纳米晶层的组织结构与力学性能。实验结果表明,表面是由分布均匀的纳米级铁素体和纳米级渗碳体晶粒构成的复合纳米结构。表面平均晶粒尺寸为10 nm。随着深度的增加,晶粒尺寸逐渐增大。表面纳米压痕硬度高达12.5 GPa,超过基体硬度的4倍,随着深度增加硬度迅速降低。表面层弹性模量没有明显变化,与基体相近。更多还原

【Abstract】 Nano-crystallization surface on GCr15 steel was obtained by ultrasonic participate peening treatment. TEM and nano-indentation techniques were used to analysis microstructure and mechanical properties. Experimental results show that nano-crystallization surface is a composite structure composed by homogeneous dispersing nanosized ferrite grains and nanosized cementite grains. Average diameter of grains on nano-crystallization surface is about 10 nm, and gradually increases as depth far to surface increases. Nanoindentation hardness of nano-crystallization surface is high up to 12.5 GPa, which is more than 4 times of the matrix, and drops sharply as depth far to surface increases. Modulus of nano-crystallization surface is much close to the matrix.更多还原