GJB 10306-2021

Specification for precision castings of oriented cylindrical superalloy turbine guide blades for aeroengines (English Version)

Standard No.

GJB 10306-2021

Language

Chinese, Available in English version

Release Date

2021

Published By

Military Standard of the People's Republic of China-General Armament Department

Latest

GJB 10306-2021

Introduction

Interpretation of core technical specifications

Technical Dimensions	DZ404 Alloy	DZ640M Alloy	JG4010 Alloy
Service Temperature Limit	980℃	980℃	1100℃
Endurance Strength (MPa)	205@980℃	83@980℃	55@1100℃
Grain control requirements	Columnar crystal deviation ≤20° Divergence ≤30°

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Quality inspection system

Standardize the establishment of a three-level inspection system: Raw material inspection (alloy ingot composition) → process inspection (grain growth monitoring) → finished product inspection (X-ray + fluorescent penetration). Taking DZ404 alloy as an example, there are 16 test items, including:

• Chemical composition detection: 11 analysis methods of HB 5220 series are adopted
• Low-magnification grain detection: columnar crystal width is required to be ≤30% of chord width
• Microporosity control: ≤1.0% in area A, ≤3.0% in other areas

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Special process control

The specification makes clear requirements on directional solidification equipment:

1. Vacuum directional solidification process must be adopted (vacuum degree ≤5×10?2Pa)
2. Temperature gradient control: ≥80℃/cm (blade body area)
3. Solidification rate: 3-6mm/min (adjusted according to alloy grade)

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Implementation suggestions

Risk link	Control measures	Detection method
Recrystallization defect	Heat treatment temperature deviation ≤10℃	HB 7782 metallographic method
Inner cavity residue	Core sintering temperature ≥1600℃	Industrial CT scan

GJB 10306-2021 history

• 2021 GJB 10306-2021 Specification for precision castings of oriented cylindrical superalloy turbine guide blades for aeroengines