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用MM2型磨损试验机,在实验室条件下,对热浸渗铝和热渗铝复合渗硼试样进行了耐磨性的对比试验,并采用扫描电镜对磨损后的形貌进行观察分析.结果表明,在干摩擦条件下,热浸渗铝复合渗硼较单独热浸渗铝具有更好的耐磨性能.热浸渗铝的磨损机制以粘着磨损为主;而热浸渗铝复合渗硼以磨粒磨损为主要机制,同时伴有粘着磨损. 相似文献
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渗硼低碳钢在热浸镀锌液中的耐蚀性 总被引:2,自引:0,他引:2
低碳钢渗硼后,由于渗层中的FeB与Fe2B化合物在锌液中具有较低的浸润性,隔断与铁与锌之间的反应,经不同表面处理和保护方法的对比试验和结果表明,低碳钢渗硼处理优于其它方法,可适用于锌锅及电热管等热浸锌锌中的耐蚀保护。 相似文献
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LUO Xin-min LI Dian-kai WANG Lan CHEN Kang-min Jiangsu University Zhenjiang Jiangsu P.R.China 《材料热处理学报》2004,25(5)
DIFFUSION treatment could eliminate the porous inthe hot-dipped aluminum layers and promote thecombination of the profile with the matrix.On the otherhand,boron atoms could decrease the brittleness of theferro-aluminum alloyed layer.More luckily,thetemperature range for boronizing is consistent with thatfor diffusion treatment.Therefore,complex boronizingwas carried out on the hot-dip aluminized steels bydiffusion-treating at high temperature in order to furtherraise wear-resistance,anti-ox… 相似文献
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目的通过研究热浸镀铝温度和时间对35Cr Mo钢镀层的影响,从而优化工艺,获得优良的铝合金镀层。方法设置5组温度梯度(700~780℃)和5个时间节点(90~450 s),对35Cr Mo钢进行热浸镀铝工艺研究,制备35Cr Mo钢热浸镀铝镀层。利用SEM观察镀层的组织形貌及其合金元素组成等,并通过显微硬度计测定镀层的厚度。结果热浸镀铝时,钢基体和铝液发生一系列冶金反应,钢镀层明显分为合金层和纯铝层。在720~760℃条件下,浸镀180~360 s时,镀层质量良好,分布均匀,厚度适宜,且没有孔洞、裂纹和漏镀现象。SEM线扫数据表明,铝层和合金层的元素构成和相对比值并不会随工艺参数的变化而改变。在180~450 s之间浸镀时,合金层的显微硬度值均能达到750 HV以上。结论在热浸镀过程中,温度和时间对镀层的厚度、组织和力学性能的影响显著,通过优化热浸镀铝工艺参数,可以改善镀层的质量。 相似文献
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稀土对低碳钢热浸渗铝扩散系数的影响 总被引:1,自引:0,他引:1
研究了热浸渗铝液中添加微量稀土元素对低碳钢热浸渗铝时铝的扩散系数的影响,结果表明,稀土元素能增大铝原子的扩散激活能,降低铝原子的扩散系数。 相似文献
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Roumiana S. Petrova Naruemon Suwattananont Veljko Samardzic 《Journal of Materials Engineering and Performance》2008,17(3):340-345
In this study the wear resistance, corrosion resistance, and oxidation resistance of boronized metallic alloys were investigated.
Thermochemical treatment was performed by powder pack boronizing process at temperature 850-950 °C for 4 h. Saw-tooth morphology
and smooth interface microstructures were observed with an optical microscope; microhardness was measured across the coating
depth. The phases present in the boron coatings depend on the substrate material. High-temperature oxidation resistance was
investigated and it was found that boron coating on ferrous alloys can resist temperatures up to 800 °C. The corrosion resistance
of the boronized samples was improved and the corrosion rate was calculated for boronized and plain specimens. Wear testing
was conducted by following the procedures of ASTM G99, ASTM D2526, and ASTM D4060. The obtained experimental results revealed
that boronizing significantly improves the wear-resistance, corrosion-resistance, and oxidation resistance of metallic alloys.
This article was presented at Materials Science & Technology 2007, Automotive and Ground Vehicles symposium held September
16-20, 2007, in Detroit, MI. 相似文献