Microstructure and phase precipitate behavior of Inconel 740H during aging

作者：Guo Yan^*; Li Tai jiang; Wang Cai xia; Hou Shu fang; Wang Bo han

来源：Transactions of Nonferrous Metals Society of China, 2016, 26(6): 1598-1606.

DOI：10.1016/S1003-6326(16)64266-8

• Inconel 740H
• aging
• microstructure
• phase precipitate

The microstructure and phase precipitate behavior and their effects on the room temperature hardness and impact toughness of Inconel 740H aged at 750 degrees C for 10000 h were investigated by SEM, TEM and mechanical analysis. The as-received alloy shows a low hardness value of HB 168 and a highest toughness value of 96 J. After an aging treatment at 800 degrees C for 16 h and cooled in air (standard heat-treated condition), fine gamma' phase particles precipitate within the grains and small carbide particles are located at the grain boundaries. The hardness increases to HB 304 and the impact toughness decreases to 15 J after standard heat treatment. A maximum hardness value of HB 331 is achieved for the alloy aged at 750 degrees C for 300 h. With increasing the aging time from 300 to 10000 h, a decrease of the hardness and toughness is observed along with an enhanced quantity of M23C6 particles and the coarsening of gamma' phase.

• 出版日期2016-6
• 单位西安热工研究院有限公司