Fan Yi, Zhou Jian, Gu Jinbo, Chi Hongxiao, Ma Dangshen, Xie Guanli
Special Steel Department of Central Iron and Steel Research Institute (CISRI), Beijing 100081, China.
Materials (Basel). 2024 Jan 8;17(2):308. doi: 10.3390/ma17020308.
The effect of N content on the microstructure and wear resistance of 4Cr13 corrosion-resistant plastic mold steel were investigated by scanning electron microscopy, transmission electron microscopy, X-ray diffraction, and tribometer. The results showed that the influence mechanism of nitrogen on the hardness of the test steels responded to the changes in the quenching temperature. When the quenching temperature was below 1050 °C, the solid solution strengthening of N played a dominant role as a wear mechanism, and as the N content increased, the hardness of the steel increased. When the quenching temperature was higher than 1050 °C, N increased the residual austenite content, resulting in a decrease in hardness. The addition of N reduced the optimal quenching temperature of the test steels. The N addition promoted the transformation of large-sized MC to MC and fine CrN, resulting in an increase in the hardness of the test steels. The influence on the wear resistance of the experimental steels differed according to the varied N contents. The addition of 0.1% N delayed the precipitation of large- sized particles in the second phase, increased the hardness of the steel, and reduced the degree of wear. However, an excessive addition of N (0.18%) led to the excessive precipitation of the second-phase particles, and the second-phase particles then gradually flaked during the wear process and continued to participate in the wear process as third-body abrasives, reducing wear resistance.
通过扫描电子显微镜、透射电子显微镜、X射线衍射和摩擦磨损试验机，研究了氮含量对4Cr13耐蚀塑料模具钢组织和耐磨性的影响。结果表明，氮对试验钢硬度的影响机制与淬火温度的变化有关。当淬火温度低于1050℃时，氮的固溶强化作为一种磨损机制起主导作用，随着氮含量的增加，钢的硬度增加。当淬火温度高于1050℃时，氮增加了残余奥氏体含量，导致硬度降低。氮的加入降低了试验钢的最佳淬火温度。氮的加入促进了大尺寸MC向MC和细小CrN的转变，导致试验钢硬度增加。根据氮含量的不同，对试验钢耐磨性的影响也不同。加入0.1%的氮延迟了第二相中大尺寸颗粒的析出，提高了钢的硬度，降低了磨损程度。然而，过量添加氮（0.18%）导致第二相颗粒过度析出，第二相颗粒在磨损过程中逐渐剥落，并作为第三体磨料继续参与磨损过程，降低了耐磨性。
