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首页> 外文期刊>ISIJ international >Heat Treatment Effect on the Microstructure and Tribological Behaviour of a High Chromium Cast Iron with 0.5% of Niobium
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Heat Treatment Effect on the Microstructure and Tribological Behaviour of a High Chromium Cast Iron with 0.5% of Niobium

机译：热处理对高铬铸铁的微观结构和摩擦学行为，0.5％铌

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摘要

A high chromium cast iron (HCCI) with 0.5%Nb was subjected to destabilization heat treatments (950°C, 1000°C, and 1050°C) for 2 hours. Specimens were characterized by optical and scanning electron microscope (SEM). It was found coarser secondary carbides as the temperature treatment increased. Niobium carbides were found agglomerated in petal-like and blade-like forms. Abrasion tests using a Dry Rubber Wheel Abrasion Tester (DRWAT) were carried out. Results indicated that the wear resistance was proportional to the matrix microhardness, the 1000°C and 1050°C temperatures presented the best wear resistance. SEM images have shown wear by plastic deformation preferentially on the matrix. The worn surfaces were scanned by a contact profilometer. Specimens which had more removed material presented a higher average roughness (S_(a) ). Also, the average roughness (S_(a) ), maximum values of peaks (S_(p) ) and pits (S_(v) ) tended to be lower as the temperature of the heat treatment increased. This can be related to the plastic deformation caused by the wear. The presence of pits was predominant on the worn surfaces.
机译：将具有0.5％NB的高铬铸铁（HCCI）进行稳定的热处理（950℃，1000℃，1050℃）2小时。通过光学和扫描电子显微镜（SEM）的特征是标本的特征。随着温度处理的增加，它被发现较粗糙的二次碳化物。发现碳化铌以花瓣状和叶片形式凝聚。进行使用干橡胶轮磨损测试仪（DRWAT）的磨损试验。结果表明，耐磨性与基质微硬度成比例，1000℃和1050℃温度呈现最佳耐磨性。 SEM图像在基质上优先通过塑性变形显示磨损。用接触轮廓仪扫描破旧的表面。具有更多除去材料的样品呈现较高的平均粗糙度（ s_（a））。此外，平均粗糙度（ s_（a）），峰值的最大值（ s_（p））和凹坑（ s_（v））倾向于降低作为热处理的温度增加。这可以与磨损引起的塑性变形有关。凹坑的存在在磨损的表面上是主要的。

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