Transactions of Materials and Heat Treatment

Title：Preparation process and microstructure properties of high-temperature resistant nickel-based alloy pipe fittings

Authors： Du Zhanjiang1 2 Cong Xiangzhou1 2 Sun Liming1 2 Peng Xiankuan1 2

Unit： 1.Beijing Guodian Futong Science and Technology Development Co. Ltd. 2.NARI Group Corporation/State Grid Electric Power Research Institute

KeyWords： ultra supercritical units C-HRA-1 high-temperature resistant nickel-based alloy pipe fittings heat treatment microstructure properties

ClassificationCode：TG319

year,vol(issue):pagenumber：2024,49(8):67-72

Abstract：

In order to explore the production process and material properties for pipe fittings of new high-temperature resistant nickel-based alloy materials,taking C-HRA-1 high-temperature resistant nickel-based alloy as the raw material, the hot pressed elbows and bent pipe with a diameter of Φ89 mm× 20 mm were trial produced, and the chemical composition of the material was tested. Then, the applied force and forming process were preliminarily determined by numerical simulation, and the sound velocity of the material was measured for the subsequent measurement of wall thickness. Furthermore, the heat treatment process was formulated, and the various data of raw material and elbow in solid solution state and solid solution+aging state were compared. The results show that the appearance, mechanical properties, hardness, metallography and non-destructive testing indicators of the material meet the designed technical requirements. The results of mass production indicate that the heating temperature before hot pressing is around 1100 ℃, and the furnace is taken out as quickly as possible to control the temperature drop as little as possible. The solution treatment temperature is about 1140 ℃, and the aging treatment temperature is about 800 ℃. The insulation time is determined based on the external size, wall thickness and other dimensions of the pipe fittings, and the water cooling is conducted as quickly as possible.

Funds：

作者简介：杜占江(1988-)，男，硕士，高级工程师 E-mail：dzjtianjin@126.com

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