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用金相、扫描电镜及电。探针等方法对9Cr18及1Cr18Ni9Ti二种不锈钢经真空热处理后的表面状况进行分析。结果表明:在一定的真空条件下(950～1200℃,真空度为10~(-3)～10~(-4)乇)加热,因选择氧性化而在不锈钢表面形成一层不连续的氧化膜,随着加热温度升高,已形成的氧化膜又会消失。同时,当不锈钢真空加热到高于某临界温度,由于表面合金元素一铬的逸(?),形成贫铬层,使钢的耐蚀性变差。水文同时观察了不锈钢在实际生产中的真空炉中加热后的表面状况,观察表明:影响不锈钢真空热处理表面质量的因素是很多的。
Metallography, scanning electron microscopy and electricity. Probes and other methods of 9Cr18 and 1Cr18Ni9Ti two stainless steel vacuum heat treatment after the surface conditions were analyzed. The results show that under certain vacuum conditions (950-1200 ℃, vacuum degree of 10 -3 to 10 -4 Torr), the surface of the stainless steel is formed with a discontinuous Oxide film, with the heating temperature, the oxide film has disappeared. Meanwhile, when the stainless steel is heated to a vacuum above a certain critical temperature, a chromium-depleted layer is formed due to the depletion of chromium in the surface alloying element, which deteriorates the corrosion resistance of the steel. Hydrology at the same time observed the stainless steel in the actual production of vacuum furnace heating surface conditions, the observation shows that: There are many factors that affect the surface quality of stainless steel vacuum heat treatment.