Metallurgical aspects of dispersion nitride hardening of high-carbon steel. Message 1. The effect of austenizing heating and tempering parameters on the phase redistribution of nitrogen and vanadium in steels

S. Shypytsyn, E. Isaeva, D. Lykhovey, T. Stepanova, N. Kiryakova
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Abstract

Systemic fundamental research for several decades at the FTIMS of the National Academy of Sciences of Ukraine and the accumulated experience of industrial application have shown that the technology of dispersion nitride hardening, which is based on the alloying of steels with nitrogen and vanadium, is a method of significantly improving the entire complex of physical, mechanical and operational properties of cast and deformed carbon, low-alloy and alloy steels of various functional purposes. The most significant advantage of the steels developed at the FTIMS of the National Academy of Sciences of Ukraine is a simultaneous significant increase in their static and cyclic strength, fracture toughness, thermal strength and heat resistance, wear resistance, annealing, weldability, reduction or complete elimination of the tendency to natural, deformation and warm embrittlement. Medium- and high-carbon pre-eutectoid and eutectoid steels of high strength and wear resistance are widely used in various fields of mechanical engineering. However, they are most widely used for railway wheels and rails. The reliability and operational resource of wheels and rails, which are in extremely harsh operating conditions, mainly determine the technical and economic performance indicators of railway transport. At the same time, existing relatively cheap non-alloyed and low-alloyed medium- and high-carbon wheel and rail steels no longer meet the modern requirements of increased speeds and load capacity of rolling stock. Keywords: carbon steels, dispersion nitride hardening, austenization, tempering, phase redistribution of nitrogen and vanadium.
高碳钢分散氮化淬火的冶金学问题。信息 1.奥氏体化加热和回火参数对钢中氮和钒相再分布的影响
乌克兰国家科学院 FTIMS 几十年的系统基础研究和积累的工业应用经验表明,基于氮和钒合金化钢的分散氮化淬火技术是一种显著改善各种功能的铸造和变形碳钢、低合金钢和合金钢的物理、机械和操作性能的方法。乌克兰国家科学院 FTIMS 开发的钢材的最大优点是同时显著提高其静态和循环强度、断裂韧性、热强度和耐热性、耐磨性、退火性、可焊性,减少或完全消除自然变形和热脆性趋势。具有高强度和耐磨性的中高碳共晶前钢和共晶钢被广泛应用于机械工程的各个领域。然而,它们最广泛地用于铁路车轮和钢轨。车轮和钢轨的运行条件极其恶劣,其可靠性和运行资源主要决定了铁路运输的技术和经济性能指标。同时,现有的相对廉价的非合金化和低合金化中碳和高碳车轮钢和钢轨钢已不能满足现代机车车辆提高速度和负载能力的要求。关键词:碳钢、分散氮化物硬化、奥氏体化、回火、氮和钒的相重新分布。
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