钛因其强度高和密度小而成为发动机压气机和风扇的理想材料．但加工中，常在钛坯料中出现局部高氮和高氧含量的硬。缺陷，因这些缺陷区硬度高于周围基体材料，其力学性能也与基体材料不同，坯料锻造成喷气发动机部件时，会在此部位产生应力集中及裂纹．超声波对检测硬。夹杂是? Titanium is the ideal material for engine compressors and fans due to its high strength and low density. However, processing, often in the titanium billets appear in the local high nitrogen and high oxygen content of the hard. Defects, because these defects in the hardness of higher than the surrounding matrix material, its mechanical properties and the base material is different from the blank forged jet engine parts, will produce stress concentration and cracks in this area. Ultrasound to detect hard. Inclusion is?