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不同渗碳状况对KHR45A钢渗碳动力学与微观组织影响分析

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摘要 本文利用电子天平、光学显微镜、扫描隧道显微镜和能谱仪对两种渗碳温度下经过不同渗碳时间后KHR45A裂解炉管材料的渗碳动力学、微观组织进行了特征研究和原因分析.结果显示:渗碳后,渗碳层区域初始枝晶间骨架状共晶碳化物结构转变为块状或者条状,晶界处的碳化物出现剥离。KHR45A的渗碳层出现了富Ni、Fe和贫Cr区,碳浓度与试样中心区域呈梯度分布造成炉管径向组织不均匀,对热疲劳和热冲击的敏感性增加。合金的非渗碳层区域析出了大量弥散的二次碳化物,碳化物的密度随其与试样表面距离的增加而降低。
作者 丁桂泉
出处 《特种设备安全技术》 2011年第6期1-3,共3页 Safety Technology of Special Equipment
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