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表面纳米化预自理对低碳钢气体渗氮行为的影响
Effects of Surface Nanocrystallization Pre-treatment on Gas Nitriding Behavior of Mild Steel
查看参考文献11篇
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文摘
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研究了表面喷丸纳米化预处理对气体渗氮行为的影响。利用低碳钢试样单面表面超声喷丸纳米化处理，另一面保持原始晶粒，在460 ℃、500 ℃、560 ℃、640 ℃四种温度不同时间气体渗氮，通过金相观察和X射线衍射法测定渗氮层的厚度和种类。对比发现在560 ℃以下渗氮时，经过表面喷丸纳米化预处理：可以提高扩散系数D和气-固传递系数β，降低氮势门槛值；使常规渗氮温度降低50 ℃左右或者渗氮时间缩短50%；使渗氮层厚度随渗氮时间增长在初期就符合抛物线规律x = At~（0.5）。640 ℃短时间渗氮时，表面纳米化预处理仍然可以起到一定的加速作用，但是随着渗氮时间的延长，表面纳米化预处理优势消失，甚至会阻碍渗层厚度的增长。 |
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其他语种文摘
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The effects of surface ultrasonic shot peening (SUSSP) nanocrystallization on gas nitriding were studied. The mild steel plates were SUSSP nanocrystallized on one side but the original coarse-grained condition on the opposite side. The relationship between the compound layer growth and nitriding time for two types of surface condition was obtained by gas nitriding at 460 ℃, 500 ℃, 560 ℃, 640 ℃ respectively with different nitriding times. The thickness of compound layer was determined by metallographic observation and the phases appeared on the top surface were identified by x-ray diffraction. When gas nitriding below 560 ℃, SUSSP nanocrystallization treatment could not only enhance both diffusion coefficient D and mass transfer coefficient β dramatically during the gaseous nitriding process but also reduce the threshold nitriding potential. With SUSSP pre-treatment, the nitriding rate can be accelerated so dramatically that nitriding time can be reduced to the half, or the conventional nitriding temperature could be reduced approximately 50 ℃. The growth of compound layer with nitriding time assumed parabolic relationship from the start of nitriding process as long as the sample surface was pre-treated by SUSSP. In the case of gaseous nitriding at 640 ℃, SUSSP pretreatment is still of some advantages to accelerating nitriding rate when nitriding time is shorter than 3 hours. With the further progress of nitriding, the advantage of SUSSP pretreatment wiel disappears and even on the contrary might slow nitride growth. |
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来源
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材料热处理学报
,2002,23(1):19-24 【核心库】
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关键词
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超声喷丸表面纳米化
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气体渗氮
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生长动力学
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地址
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1.
上海交通大学材料科学与工程学院, 上海, 200030
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LASMIS, University of Technology of Troyes, Troyes, 10000
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中国科学院金属研究所, 快速凝固非平衡合金国家重点实验室, 沈阳, 110015
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语种
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中文 |
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文献类型
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研究性论文 |
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ISSN
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1009-6264 |
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学科
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金属学与金属工艺 |
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文献收藏号
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CSCD:959725
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