Structure, Mechanical Properties and Features of Crack Growth Micromechanism of Maraging Steel Obtained by Hybrid Additive CMT Surfacing

IF 0.6 4区材料科学 Q4 METALLURGY & METALLURGICAL ENGINEERING

Metal Science and Heat Treatment Pub Date : 2024-06-29 DOI:10.1007/s11041-024-01022-4

M. Yu. Simonov, D. N. Trushnikov, Yu.D. Shchitsyn, E. A. Krivonosova, S. D. Neulybin, G. S. Shaimanov, A. O. Artyomov, M. F. Kartashev

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Abstract

The effect of heat treatment (quenching and aging) on the structure and mechanical characteristics of maraging steel Cr12Ni9Mo2Si (EP659A) obtained using a hybrid CMT surfacing technology consisting in multilayer cold metal transfer and layer-by-layer deformation hardening is investigated. Metallographic analysis of the samples is carried out using light and scanning electron microscopes. The local elemental composition of the surfacing is determined. Tensile tests at 20°C and impact tests at 20 and –100°C are performed. The micromechanisms of crack growth and their special features are investigated. The effect of structural segregation of the material during the CMT with deformation without heat treatment is detected. It is shown that the structural segregation in the surfaced layer disappears after the heat treatment; the strength characteristics and the impact toughness increase, and the elongation decreases slightly. The micromechanism of crack growth after the surfacing followed by heat treatment changes from a mixed viscous-quasi-brittle one to a viscous one. To obtain a set of high mechanical characteristics at room and negative temperatures in the material synthesized by CMT surfacing with interlayer forging, it is recommended to carry out a heat treatment involving water quenching from 940°C for 45 min and aging at 520°C for 240 min.

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混合添加剂 CMT 堆焊马氏体时效钢的结构、力学性能和裂纹生长微观机制特征

研究了热处理（淬火和时效）对采用多层冷金属转移和逐层变形硬化混合 CMT 堆焊技术获得的马氏体时效钢 Cr12Ni9Mo2Si (EP659A) 的结构和机械特性的影响。使用光学显微镜和扫描电子显微镜对样品进行了金相分析。确定了堆焊的局部元素组成。在 20°C 下进行了拉伸试验，在 20°C 和 -100°C 下进行了冲击试验。研究了裂纹生长的微观机制及其特点。检测了未经热处理的 CMT 变形过程中材料结构偏析的影响。结果表明，热处理后表面层的结构偏析消失；强度特性和冲击韧性增加，伸长率略有下降。堆焊热处理后裂纹生长的微观机制从粘-准-脆混合型转变为粘型。为了使通过 CMT 堆焊和层间锻造合成的材料在室温和负温条件下具有较高的机械性能，建议进行热处理，包括从 940°C 水淬 45 分钟和在 520°C 时效 240 分钟。

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来源期刊

Metal Science and Heat Treatment 工程技术-冶金工程

CiteScore

1.20

自引率

16.70%

发文量

102

审稿时长

4-8 weeks

期刊介绍： Metal Science and Heat Treatment presents new fundamental and practical research in physical metallurgy, heat treatment equipment, and surface engineering. Topics covered include: New structural, high temperature, tool and precision steels; Cold-resistant, corrosion-resistant and radiation-resistant steels; Steels with rapid decline of induced properties; Alloys with shape memory effect; Bulk-amorphyzable metal alloys; Microcrystalline alloys; Nano materials and foam materials for medical use.