In order to evaluate the deformation characteristics of spray formed superalloy GH742and determine the appropriate forging procedure of the alloy on this basis, the influenceof deformation temperature and strain rate ...In order to evaluate the deformation characteristics of spray formed superalloy GH742and determine the appropriate forging procedure of the alloy on this basis, the influenceof deformation temperature and strain rate on the ductility of spray formed GH742was investigated by using the Gleeble-3500 thermal-mechanical testing machine. It isshown that the forgeability of spray formed GH742 is better than conventional GH742by ingot metallurgy because of refined grain structure and enhanced chemical homo-geneity of spray formed GH742. In the temperature range of 1020 to 1100℃, theductility of spray formed GH742 is dependent on the deformation temperature and isincreased linearly in proportion to the increment of deformation temperature, whichis more than 40% at 1020℃ and more than 60% at the temperature between 1100and 1140℃. Furthermore, the results indicate the flow stress is affected considerablyby the deformation temperature and strain rate. In the temperature range of 1020 to1140℃, the maximum flow stress of spray formed GH742 increases with the incrementof strain rate and decreases with the increment of the deformation temperature.展开更多
基金supported by the National Hi-Tech.Research and Development Program of China(No.2002AA336100)
文摘In order to evaluate the deformation characteristics of spray formed superalloy GH742and determine the appropriate forging procedure of the alloy on this basis, the influenceof deformation temperature and strain rate on the ductility of spray formed GH742was investigated by using the Gleeble-3500 thermal-mechanical testing machine. It isshown that the forgeability of spray formed GH742 is better than conventional GH742by ingot metallurgy because of refined grain structure and enhanced chemical homo-geneity of spray formed GH742. In the temperature range of 1020 to 1100℃, theductility of spray formed GH742 is dependent on the deformation temperature and isincreased linearly in proportion to the increment of deformation temperature, whichis more than 40% at 1020℃ and more than 60% at the temperature between 1100and 1140℃. Furthermore, the results indicate the flow stress is affected considerablyby the deformation temperature and strain rate. In the temperature range of 1020 to1140℃, the maximum flow stress of spray formed GH742 increases with the incrementof strain rate and decreases with the increment of the deformation temperature.
