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首先,在25MN快锻机上将TA5钛合金铸锭在β区开坯锻造为250 mm的方坯。然后,分别采用三种不同工艺锻造成?55 mm的棒材。在棒材上切取试样,试样经过800℃×90 min/AC热处理。通过金相显微镜观察了金相组织,扫描电镜进行了微区分析。着重分析了TA5钛合金内部空洞缺陷产生的原因及预防措施。结果表明:TA5钛合金变形温度低、变形量大是产生空洞缺陷的主要原因;弥散分布的硼化钛颗粒在TA5钛合金内部形成硬质点,当变形温度低、变形量大时,会在其周围形成微裂纹,进一步变形时也会在其周围形成空洞;TA5钛合金在锻造过程中应采用较高的加热温度和合适的变形量并严格控制终锻温度,这有利于避免在其内部产生空洞缺陷而造成材料报废。
First, the TA5 titanium alloy ingot was forged into a 250 mm billet in the β region on a 25MN fast forging machine. Then, three separate processes were used to forge a 55 mm bar. Cut the sample on the bar, the sample after 800 ℃ × 90 min / AC heat treatment. Metallography was observed by optical microscopy and scanning electron microscopy was used to analyze the microstructure. The reasons and preventive measures of the internal cavity defects in TA5 titanium alloy are emphatically analyzed. The results show that TA5 titanium alloy has low deformation temperature and large deformation, which is the main reason of void defects. The dispersed titanium carbide particles form hard point inside TA5 titanium alloy. When the deformation temperature is low and the deformation is large, The formation of micro-cracks around the further deformation will also be formed around the hole; TA5 titanium alloy forging process should be used in the higher heating temperature and the appropriate amount of deformation and strict control of the final forging temperature, which helps to avoid the internal Produce holes and defects caused by material scrapped.