中国有色金属学报(英文版)
Transactions of Nonferrous Metals Society of China
| Vol. 10 No. 3 June 2000 |
hardness of alloy718①
（1. School of Materials Science and Engineering, Harbin Institute of Technology, Harbin 150001, P.R.China
2. Korea Institute of Machinery and Materials, 66 Sangnamdong,Changwon, Kyungnam 641-010, Korea）
Abstract:The precipitation and grain growth behavior during isothermal treatment of hot-extruded alloy 718 was investigated. It is found that the hardness of the hot-extruded alloy 718 increases with holding time at 600~700℃, but slightly decreases at 800℃. When the exposure temperature reaches above 900℃, a rapid decrease in hardness of alloy 718 occurs before the holding time of 0.3 h. Above theδsolvus temperature,γ′andγ″phases are dissolved directly into the matrix withoutδprecipitation, resulting in a rapid grain growth.
Key words: precipitation; grain growth; superalloys; isothermal treatment
