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首页> 外文期刊>Materials Science and Engineering >Effects of hot-pack rolling process on microstructure, high-temperature tensile properties, and deformation mechanisms in hot-pack rolled thin Ti-44Al-5Nb-(Mo, V, B) sheets
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Effects of hot-pack rolling process on microstructure, high-temperature tensile properties, and deformation mechanisms in hot-pack rolled thin Ti-44Al-5Nb-(Mo, V, B) sheets

机译：热装轧制工艺对热轧薄Ti-44Al-5Nb-（Mo，V，B）薄板的组织，高温拉伸性能和变形机制的影响

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摘要

Thin Ti-44Al-5Nb-1Mo-2V-0.2B alloy sheets were processed under different pack-rolling process directly from HIPed ingot in (alpha + beta) phase region. The corresponding microstructure evolution, deformation mechanisms, and high-temperature tensile properties were systematically studied. As the pack-rolling progressed and thickness of plates is reduced, the microstructure was characterized by elongated lamellar colonies with B2 + equiaxed gamma grains at colony boundaries, that transformed into nano-lamella colonies along with gamma platelets within B2 grains. The nano-lamella colonies were divided by a number of alpha mechanical twins and deformation bands. During the initial stage of rolling, mechanical twins, continuous, and discontinuous dynamic recrystallization of gamma were the primary deformation mechanisms in the multi-phase microstructure. When the total rolling reduction was 74%, alpha 2 phase dominated the deformation instead of gamma. Two kinds of straight HAGBs with similar to 60.6 degrees - 65.5 degrees and similar to 71.0 degrees - 72.7 degrees formed in pairs in alpha 2 colonies indicating the presence of twin boundaries and shear bands, respectively. While both the as-rolled alloys were produced via 4 and 6 rolling passes, exhibited high performance at 800 degrees C with ultimate tensile stress and ductility of similar to 600 MPa and 60%-70%, respectively. Nano-lamellae, nanoscale DRX grains, and omega precipitation in B2 grains at colony boundaries contributed positively to the high-temperature tensile properties.
机译：Ti-44Al-5Nb-1Mo-2V-0.2B薄合金板是直接在（α+β）相区中通过HIP铸锭在不同的压延轧制工艺下加工的。系统地研究了相应的微观组织演变，变形机理和高温拉伸性能。随着包装轧制的进行和板厚度的减小，显微组织的特征是在菌落边界处带有B2 +等轴的γ晶粒的细长片状菌落，然后随着B2晶粒内的γ血小板转变为纳米薄片菌落。纳米薄片菌落被许多α机械孪生和变形带分开。在轧制初期，机械孪晶，γ的连续和不连续动态再结晶是多相组织中的主要变形机制。当总轧制减少量为74％时，α2相占主导地位，而不是伽玛。在α2菌落中成对形成了两种近似于60.6度-65.5度和类似于71.0度-72.7度的直链HAGB，分别表明存在孪晶边界和剪切带。虽然两种铸态合金都是通过4次和6次轧制生产的，但在800℃时表现出很高的性能，极限拉伸应力和延展性分别接近600 MPa和60％-70％。纳米片，纳米级DRX晶粒和B2晶粒在菌落边界处的欧米茄沉淀对高温拉伸性能产生积极影响。

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