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首页> 外文期刊>Wear: an International Journal on the Science and Technology of Friction, Lubrication and Wear >Development and characterization of a wear resistant bainite/martensite ductile iron by combination of alloying and a controlled cooling heat-treatment
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Development and characterization of a wear resistant bainite/martensite ductile iron by combination of alloying and a controlled cooling heat-treatment

机译：合金化与控制冷却热处理相结合的耐磨贝氏体/马氏体球铁的研制与表征

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摘要

In this paper, a bainite/martensite (B/M) dual-phase ductile iron was fabricated by combining alloying and a controlled cooling heat-treatment. The microstructure, the mechanical properties and the wear performance were investigated and discussed. The ductile iron containing 3.2-3.8 wt.% carbon was alloyed with 2.5-3.0 wt.% manganese and 2.5-3.0 wt.% silicon. In general, manganese is no more than 0.7 wt.% and silicon <2.5 wt.% in commercial grade lower-bainite ductile irons. So, manganese contained in the ductile iron in this work is several times higher, and silicon slightly higher. In order to control the phase transition in the ductile iron during the heat-treatment, its continuous cooling transformation (CCT) curve was determined. The controlled cooling heat-treatment process was determined according to the CCT curve, which included three stages. The first stage was water quenching of the sample rapidly from the austenization temperature to a temperature below 350℃ in a few minutes. The second stage was heat preservation of the sample from the spraying end temperature to 200℃ in 2 h. The last stage was air cooling of the sample from 200℃ to RT. According to the analysis using be scanning electron microscope (SEM) and the X-ray diffraction (XRD), the matrix of the ductile iron had a microstructure of bainite, martensite and a little retained austenite. The hardness and impact toughness of the heat-treated ductile iron were HRC 51.5 and 21.7 J/cm{sup}2, respectively. The high values of the hardness and toughness were attributed to (1) the refined structure, (2) the presence of B/M dual-phase and (3) the presence of retained austenite. The impact abrasive wear resistance of the B/M ductile iron was observed to be comparable with that of a high chrome cast iron, and twice that of Mn13 steel.
机译：本文通过合金化和控制冷却热处理相结合的方法制备了贝氏体/马氏体（B / M）双相球墨铸铁。研究和讨论了组织，力学性能和磨损性能。将含3.2-3.8重量％碳的球墨铸铁与2.5-3.0重量％的锰和2.5-3.0重量％的硅合金化。通常，在工业级下贝氏体球墨铸铁中锰含量不超过0.7重量％，硅含量＜2.5重量％。因此，在这项工作中，球墨铸铁中所含的锰要高出几倍，而硅则要高一些。为了控制球墨铸铁在热处理过程中的相变，确定了其连续冷却转变（CCT）曲线。根据CCT曲线确定了受控的冷却热处理过程，该过程包括三个阶段。第一阶段是在几分钟内将样品从奥氏体化温度快速水淬至350℃以下的温度。第二阶段是在2小时内将样品从喷涂结束温度保温到200℃。最后一步是将样品从200℃空气冷却至室温。根据使用扫描电子显微镜（SEM）和X射线衍射（XRD）进行的分析，球墨铸铁的基体具有贝氏体，马氏体和少量残留奥氏体的微观结构。热处理球墨铸铁的硬度和冲击韧性分别为HRC 51.5和21.7 J / cm {sup} 2。硬度和韧性的高值归因于（1）精炼的结构，（2）B / M双相的存在和（3）残余奥氏体的存在。观察到B / M球墨铸铁的冲击耐磨性可与高铬铸铁媲美，是Mn13钢的两倍。

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