光子学报, 2020, 49 (4): 0414004, 网络出版: 2020-04-24  

激光冲击690高强钢位错组态与晶粒细化的实验研究 下载: 647次

Experimental Study on Dislocation Configuration and Grain Refinement of 690 High Strength Steel Treated by Laser Shock Processing
作者单位
1 南通大学 机械工程学院, 江苏 南通 226019
2 南通理工学院 机械工程学院, 江苏 南通 226002
3 香港理工大学 机械工程系, 香港 100077
4 南通中远海运船务工程有限公司, 江苏 南通 226006
5 江苏大学 流体机械工程技术研究中心, 江苏 镇江 212013
摘要
为研究激光冲击材料内部位错组态和晶粒细化的关系,用脉冲激光对690高强钢试样进行了冲击强化处理,采用扫描电镜和透射电镜分别获得了冲击后试样的扫描电子显微像和透射电子显微像、高分辨电子显微像,并对高分辨电子显微像进行快速傅里叶逆变换,从位错组态角度建立了激光冲击690高强钢晶粒细化模型.结果表明,690高强钢试样经功率密度为5.09 GW/cm2的激光冲击加载后,其材料内部位错增殖、表层晶粒细化,截面晶粒尺寸大小分布在80~200 nm;析出相与基体保持半共格关系,基体中分布着众多刃型位错、位错偶以及扩展位错等缺陷,其中位错偶是由带割阶的螺型位错运动形成;通过由位错、扩展位错、空位等构成的几何位错界面扩展交汇把原始大晶粒分割成细小晶粒;激光冲击690高强钢晶粒细化模型可以描述激光冲击690高强钢位错运动主导的晶粒细化过程.
Abstract
In order to study the relationship between dislocation configuration and grain refinement in materials treated by laser shock processing, 690 high-strength steel was impact-strengthened by pulsed laser. The scanning electron microscopy, transmission electron microscopy and high resolution transmission electron microscopy images of the sample treated by laser shock processing were obtained using scanning electron microscopy and transmission electron microscopy. The inverse fast Fourier transform was performed on the high resolution transmission electron microscopy image, and a grain refinement model of 690 high strength steel treated by laser shock processing was established from the perspective of dislocation configuration. The results show that after the 690 high-strength steel was loaded by laser shock with a power density of 5.09 GW/cm2, the internal dislocations of the material are proliferated and the surface grains are refined, with grain size ranging between 80 nm and 200 nm (cross section). The precipitation phase maintains a semi-coherent relationship with the matrix, and many defects such as edge dislocations, dislocation couples and extended dislocations are distributed in the matrix, among which the dislocation couples are formed by the screw dislocation motion with cut order. The geometrical dislocation interfaces' extension and intersection divides the original large crystal grains into fine grains, which consists of dislocations, extended dislocations, vacancies, etc.The grain refinement model of 690 high strength steel treated by laser shock processing can describe the grain refinement process dominated by the dislocation movement of 690 high strength steel.

曹宇鹏, 杨聪, 施卫东, 花国然, 李彬, 李荣. 激光冲击690高强钢位错组态与晶粒细化的实验研究[J]. 光子学报, 2020, 49(4): 0414004. Yu-peng CAO, Cong YANG, Wei-dong SHI, Guo-ran HUA, Bin LI, Rong LI. Experimental Study on Dislocation Configuration and Grain Refinement of 690 High Strength Steel Treated by Laser Shock Processing[J]. ACTA PHOTONICA SINICA, 2020, 49(4): 0414004.

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