1 Scope
This specification specifies the requirements and assurance provision and delivery preparation of master superalloy of polycrystalline castings for aeroengine.
This specification is applicable to master superalloy of polycrystalline castings subjected to vacuum induction melting (alloy ingot hereinafter).
2 Normative references
The following documents contain provisions which, through reference in this text, constitute provisions of this specification. For dated reference, subsequent amendments to (excluding any corrigendum), or revisions of, any of these publications do not apply. However, parties to agreements based on this specification are encouraged to investigate the possibility of applying the most recent editions of the documents indicated below. For undated references, the latest edition of the normative document referred to applies.
GB/T 14265 General rule of chemical analysis for hydrogen, oxygen, nitrogen, carbon and sulfur in metallic materials
GJB 5404 series Analysis methods for trace elements in super alloys
HB 5143 Method for tensile test of metals at ambient temperature
HB 5150 Method for tensile durability test of metals at high temperature
HB 5195 Method for tensile test of metals at high temperature
HB 5220 series Methods for chemical analysis of superalloy
HB 5406 Test method for dross of cast superalloy ingots
HB/Z 131 Technical requirements for selecting raw materials for cast superalloys
HB/Z 205 Specification for test pieces in chemical analysis of steel and superalloys
HB/Z 209 Specification for test pieces in gas analysis of metallic materials
3 Requirements
3.1 Materials and smelting method
3.1.1 Raw materials
The raw materials used for smelting alloy ingots shall comply with HB/Z 131 and special technical documents of smelting process.
3.1.2 Smelting method
The alloy ingot shall be smelted in vacuum induction furnace, and the smelting process shall comply with the technical documents of special vacuum induction smelting process.
In case of major changes in smelting process and conditions, the prior consent of the buyer shall be obtained.
3.1.3 Return scraps
