Research of modification influence on cracking resistance of cast iron in moulds

IF 0.6 Q4 METALLURGY & METALLURGICAL ENGINEERING
V. A. Gulevskiy, S. N. Tsurikhin, V. Gulevskiy, N. Miroshkin
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引用次数: 0

Abstract

The main feature of thermal mould work during its operation is presence of quick cyclically repeated one-side heats induced by liquid steel cast in a mould internal space, as well as consequent cooling processes (including the period after stripping of solidified ingot) [1–4]. A mould wall is subjected to thermal shock during ingot casting and solidification, which is accompanied by its thermal elastic and thermal plastic deformation (buckling). As a result, the high temperature gradient appeared in the mould wall, and essential temperature stresses are arisen; they reach the value of tensile strength of mould material, where gray cast iron is usually used. At the same time, the temperature effect of liquid steel leads to variation in the structure of metallic base, corrosion development, variation of thermal physical and mechanical properties, thermal fatigue of mould cast iron [5–9]. Multiple iterations of very intensive thermal effects on a mould (both on its construction and materials presented by cast iron) are considered as the main causes of its destruction and breakdown. The effect of thermal procedures on a mould can be assessed mostly correct only via joint analytical and experimental approach for solving this problem. Trustworthy description of the temperature field of mould wall is mandatory condition for determining the temperature effect of ingot on a mould; this is the main parameter of temperature stresses and variation of mechanical and thermal physical properties of material [10–12]. Overwhelming majority of the works manufacturing cast iron with spheroidal graphite uses the treatment technology in an open casting ladle with location of modifying additive on its bottom in the special cavity. This cavity is fenced by refractory barrier, and the process itself is known as SandwichVerfahren or “Sandwich process”. The methods of liquid cast iron processing are improved gradually [13–17]. Buckling investigation of the moulds for consumable electrodes in the process of vacuum arc remelting was conducted on the cast iron physical models in the form of hollow cylinders with internal diameter 22 mm, external diameter 32 mm and height 210 mm (scale 1:10) [18]. It is recognized at present time that computer-aided simulation of complicated tasks about heat exchange and stressed state of materials, dynamics of plastic appearances is often more acceptable than experimental investigations [19–22]. Research of modification influence on cracking resistance of cast iron in moulds
变质处理对模具用铸铁抗裂性影响的研究
热结晶器工作过程中的主要特征是存在由结晶器内部空间中的液态钢铸件引起的快速循环重复的单侧加热,以及随后的冷却过程(包括凝固钢锭剥离后的时间)[1-4]。结晶器壁在铸锭和凝固过程中受到热冲击,并伴随着热弹性和热塑性变形(屈曲)。结果,结晶器壁出现高温梯度,产生了本质温度应力;它们达到了通常使用灰铸铁的模具材料的抗拉强度值。同时,钢液的温度效应导致金属基体结构的变化、腐蚀发展、热物理力学性能的变化、模具铸铁的热疲劳[5-9]。模具上的多次非常强烈的热效应(包括其结构和铸铁材料)被认为是其破坏和击穿的主要原因。只有通过分析和实验相结合的方法来解决这个问题,才能评估热程序对模具的影响。模具壁温度场的可信描述是确定钢锭对模具温度影响的强制性条件;这是温度应力以及材料力学和热物理性能变化的主要参数[10-12]。绝大多数生产球墨铸铁的工厂都采用开放式钢包处理技术,改性添加剂位于特殊型腔的底部。这个空腔由耐火屏障围起来,这个过程本身被称为SandwichVerfahren或“三明治过程”。液态铸铁的加工方法正在逐步改进[13-17]。在内径22 mm、外径32 mm、高度210 mm(比例1:10)的空心圆柱体形式的铸铁物理模型上,对真空电弧重熔过程中消耗电极模具的屈曲进行了研究[18]。目前公认的是,计算机辅助模拟关于材料热交换和应力状态、塑性外观动力学的复杂任务通常比实验研究更容易接受[19-22]。变质处理对模具用铸铁抗裂性影响的研究
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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来源期刊
CIS Iron and Steel Review
CIS Iron and Steel Review METALLURGY & METALLURGICAL ENGINEERING-
CiteScore
2.50
自引率
12.50%
发文量
21
期刊介绍: “CIS Iron and Steel Review” is the only Russian metallurgical scientific-technical journal in English, publishing materials about whole spectrum of the problems, innovations and news of foreign iron and steel industry. The mission of this edition is to make foreign specialists aware about scientific and technical researches and development in iron and steel industry in the former USSR countries.
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