论文部分内容阅读
用透射电镜和微区Ｘ射线衍射分析了落球冲击后高铬铸铁磨球皮下不同深度残余奥氏体形变和相变情况。发现不同深度发生形变和相变的程度是不同的，在磨球表面最大，随着深度增加形变和相变的程度减小。产生可观塑性变形的深度在５ｍｍ以内，而发生相变的深度可达１０ｍｍ。不同深度相变的机理不同。共晶碳化物在落球冲击下也能发生一定的塑性变形。最后分别讨论了显微组织变形和相变对磨球抗剥落破碎性能的影响。
The deformation and phase transformation of residual austenite at different depths of high chrome cast iron balls after falling ball impact were analyzed by transmission electron microscopy and micro-region X-ray diffraction. It is found that the degree of deformation and phase transformation at different depths is different. The maximum on the surface of the grinding ball decreases with the increase of depth. The depth of considerable plastic deformation is less than 5 mm, while the depth of phase change can reach 10 mm. The mechanism of phase transition at different depths is different. Eutectic carbides in the ball impact can also occur under certain plastic deformation. Finally, the effects of microstructure deformation and phase transformation on the anti-spalling and breaking properties of grinding balls were discussed respectively.