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首页> 外文会议>World Conference on Titanium v.1; 20030713-20030718; Hamburg; DE >Titanium Alloy Billet Processing for Low Ultrasonic Noise
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Titanium Alloy Billet Processing for Low Ultrasonic Noise

机译：钛合金钢坯加工，可降低超声波噪声

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摘要

Acoustic behavior, microstructure, microtexture, and mechanical properties will be reported on several alpha-beta titanium alloys which have been processed for low ultrasonic noise. Titanium alloy billets exhibiting low levels of backscattered ultrasonic noise can be made by assuring that the scattering acoustic entities are less than about 1/10 the interrogating ultrasonic wavelength. For alpha-beta titanium alloys, acoustic scattering arises from colonies of alpha particles sharing a common crystallographic c-axis. Colony sizes - up to a few mm -are comparable with a 5 Mhz or 10 MHz acoustic wave in titanium. Alpha-beta titanium alloy billets can be produced experimentally with microstructures substantially free of crystallographic texture at scales less than about 10μm. This is achieved by multi-axial forging in the alpha plus beta phase field at conditions of temperature, strain, and strain-rate to achieve the processes of dynamic recrystallization, globularization and superplastic forming. The two-phase microstructure retards grain-growth during processing. Billets up to 250-mm diameter and 400-mm length have been produced by this approach.
机译：声学行为，微观结构，微观结构和机械性能将在几种经处理以降低超声波噪声的α-β钛合金上报道。可以通过确保散射声学实体小于询问超声波长的大约1/10来制成表现出低水平反向散射超声噪声的钛合金坯料。对于α-β钛合金，声散射是由共享共同的晶体学c轴的α颗粒菌落引起的。菌落的大小（可达几毫米）可与5 Mhz或10 MHz的钛声波相媲美。可以通过实验生产具有基本上没有晶体织构的微观结构且尺寸小于约10μm的α-β钛合金坯料。这是通过在温度，应变和应变率条件下在α加β相场中进行多轴锻造来实现动态再结晶，球化和超塑性成形的过程而实现的。两相组织阻碍了加工过程中的晶粒长大。通过这种方法已经生产出直径达250毫米，长度达400毫米的钢坯。

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