【摘要】 通过光学显微镜、洛氏硬度计等设备，分析了碳氮含量对4Cr16NiMo钢的微观组织、淬火温度、硬度以及耐点蚀性能的影响。结果表明，随着N含量增加到0.1%,4Cr16NiMo钢的最佳淬火温度由未添加氮的1070℃降低到1010℃,组织出现了明显的细化，最高硬度得到了提高。同时，加入氮可提高4Cr16NiMo钢的耐点蚀性能，且在一定范围内，氮含量越高，耐点蚀性能越强。在相同氮含量的基础上，降低0.1%的碳含量，硬度下降，淬火组织由隐晶马氏体变为板条马氏体，耐点蚀性能提高。因此通过对碳氮含量的调控，可有效降低4Cr16NiMo钢的淬火温度，提高其耐蚀性。更多还原

【Abstract】 Effect of carbon and nitrogen content on microstructure, quenching temperature, hardness and pitting resistance of 4 Cr16 NiMo steel was analyzed by means of optical microscope and Rockwell hardness tester. The results show that with the increase of N content to 0.1%, the optimum quenching temperature of the 4 Cr16 NiMo steel decreases from 1070 ℃ without nitrogen to 1010 ℃, the microstructure is obviously refined and the maximum hardness is improved. At the same time, adding nitrogen can improve pitting resistance of the 4 Cr16 NiMo steel, and in a certain range, the higher the nitrogen content, the stronger the pitting resistance. On the basis of the same nitrogen content, the carbon content decreases by 0.1%, the hardness decreases, the quenched microstructure changes from cryptocrystalline martensite to lath martensite, and the pitting resistance is improved. Therefore, by controlling the carbon and nitrogen content, the quenching temperature of the 4 Cr16 NiMo steel can be effectively reduced, and its corrosion resistance can be improved.更多还原