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Microstructure and strength-ductility balance of pure titanium processed by cryogenic rolling at various rolling reductions

机译：用轧制减少冷冻轧制加工纯钛的微观结构和强度 - 延展性平衡

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摘要

In this study, we examined the microstructure and strength-ductility balance of pure Ti processed by cryogenic-temperature rolling (CTR) at various rolling reductions (RRs). The strength-ductility balance of the processed materials was evaluated by multiplying the yield strength by the fracture elongation, which were measured by tensile testing. Generally, the strength-ductility balance deteriorates as metallic materials are strengthened, but remarkably, CTR enhanced the strength-ductility balance while significantly strengthening pure Ti by adjusting the amount of RR. CTR formed numerous thin twins in the grains of the material with suppressed dislocation generation due to the increased twinning activity and relatively decreased slip activity at a low temperature, which cannot be achieved in typical processes performed at or above room temperature. This unique micro-structure enhanced the strength-ductility balance of the processed material by intensifying grain refinement and improving resistance to necking instability. However, the strength-ductility balance deteriorated when a large RR was imposed due to the significant changes in the microstructure as the deformation proceeded. Therefore, it is important to adjust the amount of RR for CTR to impart its exceptional ability. We discuss the effects of microstructural factors on the strength-ductility balance in terms of possible strengthening mechanisms and strain-hardening capacity. The present findings could guide the design of optimized CTR for the production of pure Ti plates or sheets with excellent tensile properties and extend their use in industrial applications.
机译：在这项研究中，我们在各种轧制减少（RRS）下，检查了通过低温轧制（CTR）处理的纯TI的微观结构和强度 - 延展性平衡。通过将屈服强度乘以裂缝伸长的屈服强度来评价加工材料的强度 - 延展性平衡，这通过拉伸试验测量。通常，随着金属材料的增强，强度 - 延展性平衡劣化，但显着地，CTR通过调节RR的量来显着强化纯TI的同时提高强度 - 延展性平衡。 CTR在材料的颗粒中形成了许多薄双胞胎，由于在低温下增加的孪晶活性和相对降低的滑移活性，这不能在室温下或高于室温下进行的典型方法中实现。这种独特的微结构通过强化晶粒细化和改善颈缩稳定性的抗性来增强加工材料的强度 - 延展性平衡。然而，由于变形的显着变化，当施加大的RR时施加大RR时，强度 - 延展性平衡。因此，重要的是要调整CTR的RR的量来赋予其特殊能力。我们讨论了微观结构因素对可能的强化机制和应变硬化容量方面的强度 - 延展性平衡的影响。本研究结果可以指导优化CTR的设计，用于生产具有优异的拉伸性能的纯Ti板或薄片，并在工业应用中延长它们。

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  • 来源
    《Materials Science and Engineering》 |2020年第4期|140328.1-140328.9|共9页
  • 作者

    Jong Woo Won; Seong-Woo Choi; Jae-Keun Hong; Byeong-Chan Suh; Jeong Hun Lee; Byung Je Kwak;

  • 作者单位

    Advanced Metals Division Korea Institute of Materials Science Changwon 51508 Republic of Korea;

    Advanced Metals Division Korea Institute of Materials Science Changwon 51508 Republic of Korea;

    Advanced Metals Division Korea Institute of Materials Science Changwon 51508 Republic of Korea;

    Advanced Metals Division Korea Institute of Materials Science Changwon 51508 Republic of Korea;

    Advanced Forming Process R&D Group Korea Institute of Industrial Technology Ulsan 44413 Republic of Korea;

    Advanced Forming Process R&D Group Korea Institute of Industrial Technology Ulsan 44413 Republic of Korea School of Mechanical Engineering Pusan National University Busan 46241 Republic of Korea;

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  • 原文格式 PDF
  • 正文语种 eng
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  • 关键词

    Titanium; Cryogenic deformation; Rolling; Twinning; Tensile properties;

    机译：钛;低温变形;滚动;孪生;拉伸性质;

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