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齿轮采用碳氮共渗工艺,能提高表面强度和使用寿命。而齿轮表面含N量的高低,决定了热处理工艺的性能及齿轮表面强度。如果N含量过高,会产生显微组织缺陷,影响齿轮的使用寿命。N含量过低则会影响齿轮表面的强度。因此,如何正确测定齿轮表面的N含量对正确使用碳氮共渗工艺有着重要的意义。目前,对N含量的测定一般采用剥层试棒与同炉齿轮进行碳氮共渗淬火后,再经退火,然后进行剥层分析。在实际生产过程中,我们发现在同炉试棒中由于取样方法不同而N含量剥层分析结果也不一样。为此,我们进行了反复对比试验,摸索出分析结果更接近于产品实际N含量的检测方法。
Gear carbonitriding process, can improve the surface strength and service life. The gear surface with the level of N, determines the performance of heat treatment process and gear surface strength. If the N content is too high, there will be microstructure defects, affecting the service life of gear. N content is too low will affect the strength of the gear surface. Therefore, how to correctly determine the N content of the gear surface is of great significance to the correct use of carbonitriding process. At present, the determination of N content is generally used peel test rods with the same gear carbonitriding quenching, and then by annealing, and then peel analysis. In the actual production process, we found that in the same furnace test bars due to different sampling methods and N content of the peel analysis results are not the same. To this end, we conducted repeated comparative tests to explore the analysis results closer to the actual N content of the product testing methods.