Recent advances in the deformation processing of titanium alloys
Recent advances in the deformation processing of titanium alloys
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DOI：
10.1361/105994903322692466
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发表时间：
2003-12-01
影响因子：
2.3
通讯作者：
Bhat, RB
中科院分区：
文献类型：
--
作者：
Tamirisakandala, S;Vedam, BV;Bhat, RB
钛（Ti）合金是用于航空航天以及非航空航天工业中的几个关键应用的专用材料，并且需要大量的变形处理来成形这些材料，由于微观结构的复杂性，这带来了许多挑战。本文讨论了钛合金变形加工的一些最新进展以及在设计和优化制造工艺时将材料行为信息与模拟方案相结合的有用性。讨论主要集中在最重要的合金Ti-6Al-4V上，并对关键参数（例如，氧含量、起始微观结构、温度和应变速率）对热加工期间的变形行为的影响。这些研究是非常有用的，不仅为获得控制的微观结构，但也设计复杂的多步加工序列，以生产无缺陷的组件。应变诱导孔隙（SIP）是钛合金加工过程中的一个严重问题，科学认识的提高有助于寻求避免SIP的优雅解决方案。本文介绍了一种新的钛合金微结构转化的高速加工技术，它比传统的低速加工方法有许多优点。本文分析了最近开发的几种经济型α + β和β钛合金（即Ti-5.5Al-1Fe、Ti-10 V-2Fe-3Al、Ti-6.8Mo-4.5Fe-1.5Al和Ti-10 V-4.5Fe-1.5Al）的热加工行为，并论证了加工图在优化这些合金的工艺参数和设计热加工制度方面的有用性。用少量硼改性的钛合金正在成为替代需要高比强度和刚度的结构部件的潜在候选者。讨论了Ti-B合金变形加工过程中的微观组织机制以及与其加工相关的问题。
Titanium (Ti) alloys are special-purpose materials used for several critical applications in aerospace as well as non-aerospace industries, and extensive deformation processing is necessary to shape-form these materials, which poses many challenges due to the microstructural complexities. Some of the recent developments in the deformation processing of Ti alloys and usefulness of integrating the material behavior information with simulation schemes while designing and optimizing manufacturing process schedules are discussed in this paper. Discussions are primarily focused on the most important alloy, Ti-6Al-4V and on developing a clear understanding on the influence of key parameters (e.g., oxygen content, starting microstructure, temperature, and strain rate) on the deformation behavior during hot working. These studies are very useful not only for obtaining controlled microstructures but also to design complex multi-step processing sequences to produce defect-free components. Strain-induced porosity (SIP) has been a serious problem during titanium alloy processing, and improved scientific understanding helps in seeking elegant solutions to avoid SIP. A novel high-speed processing technique for microstructural conversion in titanium has been described, which provides several benefits over the conventional slow-speed practices. The hot working behavior of some of the affordable alpha + beta and beta titanium alloys being developed recently-namely, Ti-5.5Al-1Fe, Ti-10V-2Fe-3Al, Ti-6.8Mo-4.5Fe-1.5Al, and Ti-10V-4.5Fe-1.5Al-has been analyzed, and the usefulness of the processing maps in optimizing the process parameters and design of hot working schedules in these alloys is demonstrated. Titanium alloys modified with small additions of boron are emerging as potential candidates for replacing structural components requiring high specific strength and stiffness. Efforts to understand the microstructural mechanisms during deformation processing of Ti-B alloys and the issues associated with their processing are discussed.