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Effect of Direct Ageing Treatment on Stress-Rupture Properties of GH761 Alloy |
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| Authors: | YANG Shu-lin SUN Wen-ru LIU Fang GUO Shou-ren YANG Hong-cai HU Zhuang-qi |
| Affiliation: | 1. School of Materials and Metallurgy, Northeastern University, Shenyang 110004, Liaoning, China;Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016, Liaoning, China 2. Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016, Liaoning, China 3. School of Materials and Metallurgy, Northeastern University, Shenyang 110004, Liaoning, China |
| Abstract: | The effect of direct ageing treatment on microstrueture and stress-rupture properties of GH761 alloy was studied. Phosphorus was added to the tested alloy for its beneficial effect on stress-rupture life. It was found that the grain size of the tested alloy became much finer after direct ageing treatment, in comparison with the commercial GH761 alloy under standard heat treatment condition. The optimum direct ageing treatment has been determined as follows: 830 ℃× 4 h, air cooling 720 ℃× 24 h, air cooling. After such treatment, the higher stress-rupture prop-erties of the test alloy at 650 ℃, 690 MPa were obtained. The role of phosphorus is still effective under the condition of direct ageing treatment. |
| Keywords: | direct ageing treatment GH761 mechanical property precipitate |
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