ABSTRACT Cold deformation is an effective approach for enhancing the strength of many metallic materials. Efforts continue to be expended to improve existing processes for manufacturing non-quenched and tempered steel for industrial applications. This study investigates the treatment of non-quenched and tempered steel fasteners via cold drawing deformation and recovery treatment to achieve improved microstructural and mechanical properties. The results, which were measured using optical microscopy, scanning electron microscopy, transmission electron microscopy, tensile tests, and Charpy impact tests, demonstrated that a sample subjected to cold drawing deformation and subsequent recovery treatment exhibited increased σb, σ0.2, ε, and impact absorption energy compared to a sample subjected to cold drawing deformation alone. These enhanced properties were attributable to stable sub-grains as well as fine, uniformly dispersed precipitates which formed during recovery treatment. This study demonstrates that a combination of cold drawing deformation and recovery treatment is an effective technique for producing non-quenched and tempered steel fasteners of superior microstructural and mechanical properties.

中文翻译：

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冷拔和恢复以改善非调质钢紧固件的显微组织和机械性能

摘要 冷变形是提高许多金属材料强度的有效途径。继续努力改进用于制造工业应用的非调质钢的现有工艺。本研究调查了通过冷拔变形和恢复处理对非调质钢紧固件进行处理，以提高显微组织和机械性能。使用光学显微镜、扫描电子显微镜、透射电子显微镜、拉伸试验和夏比冲击试验测量的结果表明，经受冷拔变形和随后恢复处理的样品表现出增加的 σb、σ0.2、ε 和与单独经受冷拉伸变形的样品相比，冲击吸收能。这些增强的性能归因于稳定的亚晶粒以及在恢复处理过程中形成的细小、均匀分散的沉淀物。本研究表明，冷拔变形和恢复处理相结合是生产具有优异显微结构和机械性能的非调质钢紧固件的有效技术。