PDF
Full
Outline
The surface of 38CrMoAl steel was processed by ion nitriding at 560 ℃ with the mixture of nitrogen and argon as nitrogen source. After that, the friction and wear property of 38CrMoAl steel was studied. The results show that as the N2 volume fraction in the mixed gas increases, the thickness of nitrided layer increases, and the surface hardness of the nitrided layer increases first and then decreases. By adjusting the volume fraction of N2 in the mixed gas, the number of active nitrogen atoms can be changed, thus leading to the change in the phase composition of the nitrided layer. With N2 and Ar in a volume ratio of 2∶3, γ′-Fe4N phase is the major phase and ε-Fe2-3N phase is the minor phase in the nitrided sample. With N2 and Ar in a volume ratio of 3∶2, the nitrided layer has ε-Fe2-3N phase as the major phase andγ′-Fe4N as the minor phase. Compared with the substrate material, the ion-nitrided sample has a smaller friction coefficient and higher wear-resistance. With N2 and Ar in a volume ratio of 3∶2, the ion-nitrided sample has its compound layer in a thickness of 21.4 μm, and its average friction coefficient up to 0.26, presenting good wear resistance. The mechanisms of friction and wear include fatigue, abrasion and oxidation.
PDF
70
32
| 科 Family | 属数 Number of genus | 种数 Number of species | 占总种数比例 Percentage of total species (%) | 属 Genus | 种数 Number of species | 占总种数比例 Percentage of total species (%) |
|---|---|---|---|---|---|---|
| 鹅膏菌科Amanitaceae | 2 | 11 | 5.26 | 鹅膏菌属 Amanita | 10 | 4.78 |
| 小菇科 Mycenaceae | 2 | 12 | 5.74 | 丝盖伞属 Inocybe | 5 | 2.39 |
| 多孔菌科 Polyporaceae | 8 | 14 | 6.70 | 蜡蘑属 Laccaria | 5 | 2.39 |
| 红菇科 Russulaceae | 3 | 23 | 11.00 | 小皮伞属 Marasmius | 6 | 2.87 |
| 小菇属 Mycena | 11 | 5.26 | ||||
| 光柄菇属 Pluteus | 5 | 2.39 | ||||
| 红菇属 Russula | 17 | 8.13 | ||||
| 栓菌属 Trametes | 5 | 2.39 |
关闭全屏
No. 86 Xueyuan South Road, Haidian District, Beijing
010-62199257
qkjq@cast.org.cn
Copyright © 2025 China Association for Science and Technology. All rights reserved. For all open access content, the relevant licensing terms apply.
Sponsored by the Office of the Leading Group for Cybersecurity and Informatization of CAST, and supported by Science and Technology Review Publishing House
