Orthogonal preferred;  Boronizing agent;  Low temperature

On the basis of the preliminary selection of the osmotic agent, the optimal formula of the low-temperature boronizing agent was developed by orthogonal test optimization. Through metallographic analysis and microhardness determination, the microstructure and hardness distribution of the low-temperature boronized layer were analyzed. The results show that the orthogonal test can effectively reduce the number of tests and obtain the best osmotic formula. The low-temperature boronizing agent can better achieve low-temperature boronizing, the boronizing layer is comb-shaped, dense and loose pores, and there is no obvious transition zone and no obvious carbon-rich area in the boride front. The microhardness gradient of the boronized layer is relatively gentle, and the combination of the permeable layer and the matrix is better.