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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640°C（相当于660°C）的纯NH3气体气氛中渗氮2小时，即高温气体渗氮（HTGN），然后在225°C下回火，可产生高性能的表面涂层，无脆性化合物（白色）层。该钢还进行了等离子渗氮以进行比较。对氮化和回火试样的成分、显微组织和显微硬度进行了检测，并对其摩擦学性能进行了研究。结果表明，as气体氮化层由FeN0组成的白色层组成。095相（氮化奥氏体）和白色层下方的扩散区。回火后，白层分解为纳米级（α-Fe+γ-Fe4N+残余奥氏体）贝氏体组织，硬度高达1150HV/25g。磨损试验结果表明，复合HTGN+回火产生的耐磨性和磨损系数分别比常规等离子渗氮产生的高和低。

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