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首页> 外文期刊>Journal of Materials Engineering and Performance >Modification of Low-Alloy Steel Surface by High-Temperature Gas Nitriding Plus Tempering
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Modification of Low-Alloy Steel Surface by High-Temperature Gas Nitriding Plus Tempering

机译：通过高温气体氮化加回火改造低合金钢表面

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摘要

The low-alloy steel was nitrided in a pure NH3 gas atmosphere at 640 similar to 660 A degrees C for 2 h, i.e., high-temperature gas nitriding (HTGN), followed by tempering at 225 A degrees C, which can produce a high property surface coating without brittle compound (white) layer. The steel was also plasma nitriding for comparison. The composition, microstructure and microhardness of the nitrided and tempered specimens were examined, and their tribological behavior investigated. The results showed that the as-gas-nitrided layer consisted of a white layer composed of FeN0.095 phase (nitrided austenite) and a diffusional zone underneath the white layer. After tempering, the white layer was decomposed to a nano-sized (alpha-Fe + gamma'-Fe4N + retained austenite) bainitic microstructure with a high hardness of 1150HV/25 g. Wear test results showed that the wear resistance and wear coefficient yielded by the complex HTGN plus tempering were considerably higher and lower, respectively, than those produced by the conventional plasma nitriding.
机译：低合金钢在纯NH3气体气氛中氮化为640，类似于660℃，即高温气体氮化（HTGN），然后在225℃下回火，这可以产生高无脆化合物（白色）层的性能表面涂层。钢也是等离子体氮化以进行比较。研究了氮化和回火标本的组成，微观结构和显微硬度，并研究了其摩擦学行为。结果表明，天然气氮化层由由FEN0.095相（氮化奥氏体）组成的白色层和在白色层下方的扩散区组成。回火后，用高硬度为1150HV / 25g，将白色层分解成纳米大小（α-Fe +γ'-Fe4N +保留奥氏体）贝氏体微观结构。磨损试验结果表明，复杂HTGN加回火所产生的耐磨性和磨损系数分别比通过常规等离子体氮化产生的耐磨性和较低。

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