Microstructure Evolution and Strengthening Mechanism of Regenerated Brass Alloy under Fe-Mn Control during Cold Drawing

IF 3.3 3区材料科学 Q2 MATERIALS SCIENCE, MULTIDISCIPLINARY Metals and Materials International Pub Date : 2024-08-01 DOI:10.1007/s12540-024-01754-1

Xiang Li, Baozhong Ma, Chengyan Wang, Yongqiang Chen

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Abstract

Fe from raw materials and processing are inevitably introduced in the direct regeneration process of brass alloys from scrap copper, which may significantly affect the cold working performance of regenerated brass. Developing regenerated brass alloys that can be used for cold drawing under large deformation amounts remains a challenge. In this paper, the regenerated brass alloy wire was prepared by the method of Fe-Mn in-situ control casting and hot extrusion. The plasticity of regenerated brass was significantly improved during cold drawing after Fe-Mn microalloying control. The direct single pass ultimate cold working rate can reach 42% and the yield strength, tensile strength, total elongation, and hardness were 635 MPa, 649 MPa, 3.5%, and 181.2HV, respectively. Cold drawing wires showed good torsional resistance. The evolution of microstructure and properties of regenerated brass during cold drawing was studied, and the strengthening mechanism was determined. Work hardening induced by dislocation strengthening is the dominant strengthening mechanism. In the cold drawing process, the α phase of the FCC structure and the β phase of the BCC structure form a good coordination between soft and hard domains. The accumulation of dislocation introduced in the cold drawing process, the synergistic effect of the sliding mechanism, and the nanotwin deformation mechanism ensure the ideal cold drawing performance of the regenerated brass.

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冷拔过程中铁锰控制下再生黄铜合金的显微组织演变和强化机理

在利用废铜直接再生黄铜合金的过程中，不可避免地会引入原材料和加工过程中产生的铁，这可能会严重影响再生黄铜的冷加工性能。开发可用于大变形量冷拔的再生黄铜合金仍是一项挑战。本文采用铁锰原位控制铸造和热挤压的方法制备了再生黄铜合金线材。在控制铁锰微合金化后，再生黄铜在冷拔过程中的塑性得到了显著改善。直接单程极限冷加工率可达 42%，屈服强度、抗拉强度、总伸长率和硬度分别为 635 MPa、649 MPa、3.5% 和 181.2HV。冷拔钢丝具有良好的抗扭性。研究了冷拔过程中再生黄铜微观结构和性能的演变，并确定了其强化机理。位错强化引起的加工硬化是主要的强化机制。在冷拔过程中，FCC 结构的 α 相和 BCC 结构的 β 相在软域和硬域之间形成了良好的协调。冷拉过程中引入的位错累积、滑动机制和纳米孪晶变形机制的协同作用确保了再生黄铜理想的冷拉性能。

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来源期刊

Metals and Materials International 工程技术-材料科学：综合

CiteScore

7.10

自引率

8.60%

发文量

197

审稿时长

3.7 months

期刊介绍： Metals and Materials International publishes original papers and occasional critical reviews on all aspects of research and technology in materials engineering: physical metallurgy, materials science, and processing of metals and other materials. Emphasis is placed on those aspects of the science of materials that are concerned with the relationships among the processing, structure and properties (mechanical, chemical, electrical, electrochemical, magnetic and optical) of materials. Aspects of processing include the melting, casting, and fabrication with the thermodynamics, kinetics and modeling.