Method for casting large-scale K403 high-temperature alloy die for isothermal forging

Abstract

The invention belongs to a casting technology and relates to a method for casting a large-scale die for isothermal forging by using K403 high-temperature alloy. The method for casting the large-scale K403 high-temperature alloy die for isothermal forging comprises the following steps of: designing a casting drawing according to a die requirement, and determining a machining allowance, a casting comprehensive shrinkage rate, a gating system and the position and the size of a dead head; manufacturing a sand mold and drying, preparing a raw material according to alloy chemical components, and smelting and pouring; pouring the casting and keeping in a vacuum state for at least 20 minutes, and discharging and cooling; keeping cooling after discharging and opening a box after finishing solidification; and reducing the temperature of the casting of which the casting head is cleaned step by step, and discharging. By the method, the thermal stress is reduced effectively, cracks and breakage can be prevented, the quality of the die can be improved and the service life of the die can be prolonged by strictly controlling the individual components such as carbon, zirconium and the like and subsequent cooling and cleaning processes, and improving the process, so the method has great actual application value.

Description

technical field [0001] The invention belongs to casting technology and relates to a method for casting a large mold for isothermal forging by using K403 superalloy. Background technique [0002] With the rapid development of aviation and aerospace technology, the requirements for material performance are getting higher and higher, and the size of structural parts is getting larger and larger. Fully tap the potential of materials to manufacture super-large structural parts, especially super-large structural parts with a length and width of more than 2000mm. Structural components are also increasingly necessary. [0003] In the manufacturing process of large structural parts, isothermal forging has great advantages in providing high-performance, super-large, and low-cut forgings. During isothermal forging, the mold must be heated to a temperature close to the temperature at which the forging starts. Titanium alloy isothermal forging requires a mold temperature of 930°C-950°C....

AI Technical Summary

Problems solved by technology

In fact, due to the differences in the various components of K403, the use of general casting methods to manufacture isothermal forging molds will have a greater impact on the phase composition of K403 superalloys, and even produce unfavorable δ phases. During the process, the crack and fracture tendency of the mold is very serious, which leads to the scrapping of the mold and huge economic losses