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| Analysis of aged microstructure and mechanical properties of tempaloy AA-1 |
| WANG Shuo，LIU Guang-xing，TAN Shu-ping |
| （Material Research Institute， Harbin Boiler Company Limited， Harbin 150046， Heilongjiang， China） |
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Abstract The relationship between the precipitation of M23C6 carbide and mechanical properties was investigated after the 650 ℃ aging process of Tempaloy AA-1. The microstructure and corresponding fracture surface under impact and tensile tests of the Tempaloy AA-1 with 0 ， 500 ， 1 000 ， 5 000 and 8 000 h aging duration were analyzed by scanning electron microscopy and transmission electron microscopy. The results show that the ocuurrence and distribution at grain boundary of M23C6 carbide were found， as the aging time of Tempaloy AA-1 increases. Due to the grain boundary strengthening， the Tempaloy AA-1 aged for 500 h showed a maximum yield strength and tensile strength. The obvious growth of M23C6 carbide at grain boundaries with increasing aging time to 8 000 h made grain boundary strengthening become weaken， resulting in a slight decrease of strength. There is no obvious reunion of M23C6 carbide after long time aging， as a result， the Tempaloy AA-1 material still has good ageing impact toughness. The good mechanical properties and impact toughness after aging is due to the good microstructure stability of Tempaloy AA-1 after long time aging.
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Received: 14 May 2015
Published: 06 January 2016
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2016, Vol. 51 
