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热挤压对钛棒、钛合金棒等钛合金材料的性能影响分析

发布时间: 2019-06-16 16:51:05    浏览次数:

钛棒钛合金棒坯料的热导率低,在热挤压时会使表层与内层产生极大的温差,当挤压筒的温度为400度时,温差可达200~250度。在吸气强化和坯料断面有很大温差的共同影响下,坯料表面和中心的金属产生极不相同的强度性能和塑性性能,在挤压过程中就会造成很不均匀的变形,在表面层中产生大的附加拉应力,成为在挤压制品表面形成裂口和裂纹的根源。钛棒及钛合金棒制品的热挤压过程比铝合金、铜合金,甚至钢的挤压过程更为复杂,这是由钛棒及钛合金棒特殊的物理化学性能所决定的。

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