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Structure and properties control of carbon alloys cast blanks produced by aluminothermic method with following heat treatment
IOP Conference Series: Materials Science and Engineering Pub Date : 2020-12-01 , DOI: 10.1088/1757-899x/971/2/022053
V V Predein , O N Komarov , S G Zhilin

Casting production with aluminothermic method is one of the mainstream lines of production process designing and improvement in foundry practices. Cast blanks production methods based on thermite mixtures application provide economic benefits due to machinery and steel production plants waste (ferrous and non-ferrous chip scrap and scale) usage. Alloys resulting from exothermal reaction are used for cast blanks production. For minimization of expenses coming from power consumption, the oncoming cast blanks properties correction is conducted at initial stages to put them into operation immediately after production, which is achieved by adding fillers in charge materials to decrease reaction’s heating effect or by external heat supply. In some cases reaction’s high intensity and temperature lead to difficulties in final properties foreseeing therefore affecting the formation of repairable and irrepairable defects. Cast blanks with irrepairable defects are used as charge materials in further recasting in traditional melting units, which increases metal waste processing efficiency and non-wastefulness. Cast blanks with repairable defects are a subject to further processing. E.g., in case of chemical and structural inhomogeneity, high-rate internal stress, cast blanks are a subject to complex heat treatment, that allows bringing properties to the required level. Annealing is applied to achieve better homogeneity compared to as-cast condition. After heat treatment cast blanks contain granular pearlite or ferrite with various inclusions. It’s been established that high rates of alloying aluminium increase the high-carbon steels hardening temperature. After 1000C hardening the samples have martensite structure with hardness index up to 628 HBW.



中文翻译:

铝热法后处理热处理碳合金铸坯的组织和性能控制

铝热法铸造生产是生产工艺设计和铸造实践改进的主流路线之一。由于使用了机械和钢铁生产厂的废料(黑色和有色金属屑废料和氧化皮),因此基于铝热剂混合物的铸坯生产方法可带来经济效益。由放热反应得到的合金用于铸坯的生产。为了最大程度地降低功耗所产生的费用,即将进行的铸坯性能校正会在初始阶段进行,以使其在生产后立即投入运行,这是通过在装料中添加填料以降低反应的加热效果或通过外部供热来实现的。在某些情况下,反应的高强度和高温会导致最终性能难以预见,因此影响了可修复和不可修复缺陷的形成。具有无法修复的缺陷的铸坯在传统的熔化设备中用作进一步重铸的装料,从而提高了金属废物的处理效率和无浪费性。具有可修复缺陷的铸坯需要进一步处理。例如,在化学和结构不均匀,高内部应力的情况下,铸坯需要进行复杂的热处理,从而使性能达到所需的水平。与铸态相比,退火可实现更好的均匀性。热处理后的铸坯包含粒状珠光体或铁素体,以及各种杂质。已经确定,高合金化的铝含量会增加高碳钢的淬火温度。1000C硬化后,样品具有马氏体结构,硬度指数高达628 HBW。

更新日期:2020-12-01
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