模具钢回火脆性4Kh4N5М4F2

O. Sydorchuk, O. Bykov, A. P. Pozniy
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引用次数: 0

摘要

给出了结构钢牌号4Kh4N5М4F2热处理后的研究结果。在“Fe-C”体系中形成固体取代溶液时,晶体结构参数“a”的最大值与450-500℃回火脆性的表现有关。建立了所研究钢的晶体结构特性与复杂的物理力学性能之间的联系。马氏体晶格基本单元参数««的最大值(a = 0.28848 nm)反映了α-固溶体的最大饱和度,增加了晶格的抗变形能力,提高了回火马氏体的硬度(可达56 HRC),改变了物理结构敏感值(比电导率增加到0,200 Om•mm2/m),提高了抗拉强度。降低冲击强度(可达15 J/cm2),并在450-500℃的温度下增加脆性。证明了AK7ch铝合金在运行过程中不达到脆性温度(460℃以上)的情况下,使用基体(钢4Kh4N5М4F2,不使用锻造技术)进行热变形的可能性。关键词:模具钢,晶体结构,热处理,物理力学性能。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Tempering brittleness of die steel 4Kh4N5М4F2
The results of research of structural steel brand 4Kh4N5М4F2 after heat treatment are given. Manifestations of tempering brittleness at a temperature of 450-500 °C, associated with the maximum value of the parameter «a» of the crystal structure during the formation of a solid substitution solution in the system "Fe-C". The connection between the peculiarities of the crystal structure of the studied steel and the complex of physical and mechanical properties is established. The maximum value of the parameter «а» (a = 0.28848 nm) of the elementary cell of martensite crystal lattice reflects the maximum saturation of the α-solid solution, which increases the resistance of the crystal lattice to deformation, increase the hardness of tempering martensite (up to 56 HRC), change the physical structure sensitive value (increase in specific conductivity to 0,200 Om•mm2/m), increase the tensile strength, reduce the impact strength (up to 15 J/cm2) and increase the brittleness at temperatures of 450-500 °C. The possibility of using matrices (steel 4Kh4N5М4F2, without forging technology) for hot deformation of aluminum alloy AK7ch, which during operation does not reach the temperature of brittleness (above 460 ºC), is demonstrated. Keywords: die steel, crystal structure, heat treatment, physical and mechanical properties.
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