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一、直接腐蚀法、保护氧化法和渗碳法对比为排除多余因素的干扰,全部试样取在同一炉号的同一根棒材上,彼此邻接。直接腐蚀法为930±10℃保温3小时后水冷。除30CrMnSi再经500±10℃1.5小时回火外,其余钢号均不回火。腐蚀剂均可用1%海鸥洗涤剂的饱和苦味酸水溶液。保护氧化法的保护剂为石墨粉,也是930±10℃保温3小时后水冷。然后对观察面进行倾斜打磨和抛
First, the direct corrosion method, the protection of oxidation and carburizing contrast to rule out the interference of excess factors, all the samples taken in the same heat number of a bar, adjacent to each other. Direct corrosion method for 930 ± 10 ℃ after 3 hours of water cooling. In addition to 30CrMnSi 500 ± 10 ℃ 1.5 hours after tempering, the rest of the steel are not tempered. Etchants are available 1% seagull detergent saturated picric acid solution. Protective agent for the protection of oxidation of graphite powder, also 930 ± 10 ℃ for 3 hours after the water-cooled. Then tilt the observation surface and throw