Numerical Simulation of Hot Extrusion Process of GH3625 Alloy Tubes
In order to obtain GH3625 superalloy seamless pipe, the GH3625 superalloy seamless pipe with Φ28 × 5.5 mm was developed through short-flow hot extrusion forming and cold rolling molding process. And a comprehensive evaluation to the microstructure and mechanical properties for GH3625 superalloy seamless pipe was conducted. The results show that hollow tube has been successfully extruded the GH3625 superalloy tube with Φ43 × 9.5 mm under the condition of fixed extrusion speed of 50 mm/s, preheating temperature of 1150 °C and extrusion ration of 7.4. The alloy tube is composed of a small amount of deformation twin and a large number of equiaxed crystal mixed crystal structure, the average grain size is about 8.6, and the tensile strength at room temperature and elongation at break are 771 MPa and 52.33%, respectively, and have good cold working performance and mechanical properties. The performance of GH3625 superalloy seamless pipe after cold rolling and annealing is in accordance with ASTM-B163-04 international standard.
KeywordsGH3625 alloy Hot extrusion Numerical simulation Orthogonal experiment
This study was funded by the National Natural Science Foundation of China (No. 51661019), The Science and Technology Projects of Gansu Province (No. 145RTSA004), the State Key Laboratory of Advanced Processing and Recycling of Nonferrous Metals, Lanzhou University of Technology.
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