CHEN Li
,
ZHOU Hong
,
ZHAO Yu
,
REN Luquan
钢铁研究学报(英文版)
The reticulate unsmoothed surfaces on HD die steel, which imitate the surface of soilburrowing animals (such as the dung beetle, earthworm, pangolin, and ant) are produced with various laser parameters. The characteristics (including width, depth, area ratio, and volume), microstructure, and hardness of the unsmoothed units are studied. At the same time, the wear resistance of the material with an unsmoothed surface is measured. The results show that the width and volume of the unit increase, the microstructure becomes coarser, the hardness decreases, and the wear resistance improves with the increase of the current intensity and pulse duration within a certain range. However, there is little difference between the extent to which the wear resistance of the material increases and the unsmoothed surface, when the current intensity and pulse duration increase to some extent. The wear resistance of the unsmoothed material under 300 A or 20 ms is better in the experiments. The improving extent of the wear resistance lies in a combination of the characteristics, microstructure, and hardness of the unsmoothed unit. An unsmoothed material with better properties can be processed if the laser parameters are well matched.
关键词:
microstructure;property;laser parameter;unsmoothed surface
CHEN Li
,
ZHOU Hong
,
ZHANG Zhihui
,
REN Luquan
钢铁研究学报(英文版)
The striations on the surface of 3Cr2W8V die steel were processed by laser. The microstructure, hardness, wear resistance and thermal fatigue behavior of the specimens processed by laser were measured. The appearance and mechanism of thermal fatigue crack propagation in the zone processed by laser were observed and discussed. The results show that the wear resistance and thermal fatigue resistance of materials processed by laser are all better than those of the unprocessed material. The processed zone by laser plays a role in baffling wearing process and crack propagation. The pilenail effect of processed zone is the main factor for improving the wear resistance and thermal fatigue resistance of material.
关键词:
laser processing;die steel;property
