The effect of forging texture and machining parameters on the fatigue performance of titanium alloy disc components
The effect of forging texture and machining parameters on the fatigue performance of titanium alloy disc components
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DOI：
10.1016/j.ijfatigue.2020.105949
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发表时间：
2021-01-01
影响因子：
6
通讯作者：
Jackson, M.
中科院分区：
文献类型：
--
作者：
Fernandez, Daniel Suarez;Wynne, B. P.;Jackson, M.
研究了Ti-6Al-2SN-4Zr-6Mo锻造圆盘的疲劳失效机理：锻造和机械加工对疲劳的影响是解耦的。四点弯曲疲劳试验方法能够在圆盘周边的多个位置研究裂纹的萌生和扩展特性。不同位置的疲劳性能差异(接近60%)以及裂纹的萌生和扩展行为与上游锻造过程中形成的异质结晶织构有关。研究发现，无论切割速度如何，下游加工工艺都能延长疲劳寿命。然而，即使在机械加工后，锻造阶段固有的环向疲劳不均匀仍然很明显。
The Mechanisms of fatigue failure in Ti-6Al-2Sn-4Zr-6Mo forged discs are investigated: the effects of forging and machining operations on fatigue are decoupled. A four-point bend fatigue testing approach enabled the crack initiation and propagation characteristics to be studied at multiple locations around the disc periphery. Fatigue performance variation (of similar to 60%) at different positions, and crack initiation and propagation behaviour were linked to the heterogeneous crystallographic texture developed during upstream forging. Downstream machining processes were found to increase fatigue life, regardless of the cutting speed. However, circumferential fatigue heterogeneity, inherent from the forging stage was still evident even after machining.