DIE STEEL 4Х4Н5М4Ф2 (WITHOUT FORGING TREATMENT) FOR HOT DEFORMATION OF ALUMINUM ALLOY

О. Sydorchuk
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Abstract

Purpose. Production of steel with controlled austenitic transformation during operation of the 4Х4Н5М4Ф2 grade (without forging treatment) using the technology of electroslag remelting and establishing optimal modes of heat treatment (annealing, quenching and tempering). Production of tools (matrices) from 4Х4Н5М4Ф2 steel (without forging treatment) for hot deformation of aluminum alloy at operating temperatures below the critical point A1. Research methods. Metallographic analysis of experimental die steels 4Х4Н5М4Ф2 (without forging treatment) and forged 4Х5МФ1С: study of metal structure; determination of specific resistance; determination of tensile strength; determination of hardness and impact strength. Results. The results of research on the optimization of heat treatment modes (quenching and tempering) of 4Х4Н5М4Ф2 steel (without forging treatment) are given. Adjusted chemical composition (4Х4Н5М4Ф2) and optimized mode of heat treatment of steel, which allowed to increase heat resistance up to a temperature of 650 °С. The tempering temperature of steel (475±25 °С) at which irreversible temper brittleness occurs is established. Experimental and industrial tests of steel 4Х4Н5М4Ф2 (without forging treatment) for hot deformation of AK7ч aluminum alloy are presented. It is shown that compared to forged steel H13 (an analogue of 4Х5МФ1С), which is used at one of the Chinese enterprises, the experimental steel has practically the same resistance . Scientific novelty. In the process of partial recrystallization (incomplete annealing at a temperature of 750±20 °C) of 4Х4Н5М4Ф2 steel (without forging treatment), a spheroidized carbide component is formed, which leads to an improvement in the mechanical processing of the workpiece for the manufacture of matrices. Practical value. The possibility of using steel with an adjustable austenitic transformation during operation of the 4Х4Н5М4Ф2 grade (without forging treatment) is shown for a wide range of operating temperatures of hot deformation: copper-nickel (at an operating temperature above the critical point A3) and aluminum alloy (at an operating temperature below the critical point A1) with increased service life compared to forged steel 4Х5МФ1С.
用于铝合金热变形的模具钢4Х4Н5М4Ф2(未经锻造处理)
目的。利用电渣重熔技术,建立最佳热处理模式(退火、淬火、回火),生产4Х4Н5М4Ф2级(未经锻造处理)运行过程中可控奥氏体相变的钢。用4Х4Н5М4Ф2钢(未经锻造处理)生产工具(基体),用于在低于临界点A1的工作温度下对铝合金进行热变形。研究方法。实验模具钢的金相分析4Х4Н5М4Ф2(未经锻造处理)和锻造4Х5МФ1С:金属组织的研究;比电阻的测定;抗拉强度测定;硬度和冲击强度的测定。结果。给出了4Х4Н5М4Ф2钢(未经锻造处理)热处理方式(淬火和回火)的优化研究结果。调整化学成分(4Х4Н5М4Ф2)和优化钢的热处理方式,这使得耐热性提高到650°С。确定了发生不可逆回火脆性的钢的回火温度(475±25°С)。介绍了ak7铝合金热变形用4Х4Н5М4Ф2钢(未经锻造处理)的试验和工业试验。结果表明,与中国某企业使用的锻造钢H13 (4Х5МФ1С类似物)相比,实验钢具有几乎相同的阻力。科学的新奇。4Х4Н5М4Ф2钢(未经锻造处理)在局部再结晶(750±20℃温度下的不完全退火)过程中,形成球化的碳化物成分,从而改善了工件的机械加工,用于制造基体。实用价值。使用具有可调奥氏体相变的钢在4Х4Н5М4Ф2级(未经锻造处理)运行期间的可能性显示在热变形的广泛工作温度范围内:铜镍(在高于临界点A3的工作温度下)和铝合金(在低于临界点A1的工作温度下)与锻造钢相比使用寿命更长4Х5МФ1С。
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