Abstract: In order to predict possible structural cracking of titanium equipment after fire, constant temperature heating experiments were conducted to simulate post-fire environment, and mechanical properties and metallographic structure of TA2 under different cooling methods after high temperature treatment were studied. The results show that when heating temperature is lower than TA2 phase transition temperature, mechanical properties of samples will decline as heating temperature increases and time prolongs. When it exceeds that of TA2 phase transition, they tend to be stable. But when heating time exceeds 60 min, plasticity decreases due to high temperature, and sample breaks early when it is stretched. In addition, water-cooled treatment can make metallurgical structure of TA2 more regular than air-cooled one. So when a fire occurs around the titanium equipment, fire accident should be suppressed within a short time and equipment should be cooled as soon as possible to reduce probability of secondary accidents caused by equipment rupture.

Key words: industrial pure titanium (TA2), after fire, mechanical properties, safety prediction, metallographic structure