A study on Solid Nitriding
Date Issued
2006
Date
2006
Author(s)
Chen, Chih-Chieh
DOI
zh-TW
Abstract
In order to understand the characteristics of solid nitriding, and the feasibility of method applied to steels such as SUS304, JAC1 and SACM645, we heated steel samples in the nitriding powder of a given amounts. The powder would generate active nitrogen that permeated into the steel surface. The purpose of the article was to study the influences of nitriding temperature, nitriding time and composition of the steel on the nitriding depth, the distribution of hardness, the microstructure, and the corrosion-resistance to hot aluminum liquid of the nitriding layer. In addition, the effect of solid nitriding was compared with Gas nitriding. The results were summarized as follows:
1.The solid nitriding could be performed with steels of SUS304, JAC1 and SACM645. SUS304 was the best, JAC1 was the second and SACM645 was the third on the hardening effect of nitriding.
2.The best surface hardness and hardened depth could be obtained for the nitriding time of 12 ~ 15 hours. The surface hardness and hardened depth would not increase significantly for the nitriding time over 15 hours.
3.SUS304 could be nitrided by the nitriding powder at 450℃. Because the low nitriding temperature was not easy to produce white layer and deformation, this method could be applied to the precision machine parts. However, it took more time to get an obvious nitriding layer.
4.In order to gain an effective surface hardness and thick hardening depth, the temperature range from 500℃ to 550℃ was the optimal temperature for the solid nitriding.
5.Steel after solid nitriding could have better corrosion resistance to aluminum liquid. Besides, the corrosion resistance was the best for the steel nitrided at 550℃.
6.The complicated workpiece performed solid nitriding could obtain a more uniform hardening layer than traditional gas nitriding.
7.The solid nitriding was inferior to the traditional gas nitriding on hardening effect, but the solid nitrided layer had better toughness. This feature could improve the brittleness of the gas nitrided layer.
Keywords: Solid nitriding, Gas nitriding, Corrosion-resistance test
Subjects
固體粉末滲氮法
氣體滲氮法
融蝕試驗
Solid nitriding
Gas nitriding
Corrosion-resistance test
Type
thesis
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