Hubicki Rafał, Richert Maria, Wiewióra Marcel
Grupa Kęty S.A. S.A., str. Kościuszki 111, 32-650 Kęty, Poland.
AGH University of Science and Technology, str. Gramatyka 10, 30-067 Kraków, Poland.
Materials (Basel). 2020 May 17;13(10):2311. doi: 10.3390/ma13102311.
The paper concerns the effect of annealing time and temperature on the properties of the nitride layer on X37CrMoV51 tool steel used in the extrusion aluminium industry. Samples made from X37CrMoV51 steel were hardened and tempered, and then nitrided at 530 °C. After nitriding, the samples were annealed in a furnace at 470 °C for 8 h, 12 h, 24 h, 30 h and 60 h, and additionally for 20 h at 270 °C. The samples were tested for structure, hardness and abrasion immediately after nitriding and again after annealing. It was found that annealing the nitrided samples leads to degradation of the nitride layer, accounting for the decrease of hardness. The annealing of the samples at 470 °C, over 12 h causes a decrease in mean hardness value from 1176 HV to 1103 HV, and annealing the samples over 30 h at this temperature leads to a decrease in hardness to 964 HV. The changes in nitrogen content in the white (compound) and diffusion layers and the resulting consequences of changes in phase composition and properties were evaluated. Annealing over 30 h at 470 °C caused the white layer to disappear and the average nitrogen content in the diffusion layer to decrease to the level of about 5-6 at%.
本文研究了退火时间和温度对用于挤压铝工业的X37CrMoV51工具钢上氮化物层性能的影响。由X37CrMoV51钢制成的样品先进行淬火和回火，然后在530℃下进行氮化处理。氮化处理后，将样品在炉中于470℃分别退火8小时、12小时、24小时、30小时和60小时，另外还在270℃下退火20小时。在氮化处理后以及退火后立即对样品进行结构、硬度和耐磨性测试。结果发现，对氮化后的样品进行退火会导致氮化物层退化，这是硬度降低的原因。在470℃下对样品进行超过12小时的退火会使平均硬度值从1176 HV降至1103 HV，在此温度下对样品进行超过30小时的退火会使硬度降至964 HV。评估了白色（化合物）层和扩散层中氮含量的变化以及相组成和性能变化所产生的后果。在470℃下进行超过30小时的退火导致白色层消失，扩散层中的平均氮含量降至约5 - 6原子百分比的水平。
