ए 286 की लॉकिंग इन्सर्टची उष्णता उपचार प्रक्रिया काय आहे?

A286 की लॉकिंग इन्सर्टसाठी उष्णता उपचार प्रक्रियेमध्ये प्रामुख्याने दोन टप्पे असतात: उपाय उपचार आणि वृद्धत्व. विशिष्ट प्रक्रिया पॅरामीटर्स आणि पायऱ्या खालीलप्रमाणे आहेत:

1. उपाय उपचार
– तापमान श्रेणी: सामान्यतः, heating at 982°C (1800°F) for one hour, followed by rapid cooling. Some standards recommend holding at 899°C for two hours, followed by rapid cooling.
– Cooling Method: सामान्यतः, air cooling or oil quenching is used.
– Purpose: High-temperature heating dissolves carbides and nitrides in the alloy, resulting in a single-phase austenite structure, relieving processing stresses, and improving the toughness and ductility of the material.

2. Aging Treatment
– तापमान श्रेणी: 704-760°C (1300-1400°F).
– Holding Time: सामान्यतः 12-16 तास, followed by air cooling.

3. Special Treatment
– Double Aging: काही प्रकरणांमध्ये, a double aging treatment is performed. This involves holding at 704/760°C for 16 तास, then air cooling to 649°C, holding for another 8-12 तास, and finally air cooling. This treatment further improves notch cracking strength while maintaining a balance between toughness and hardness.
– Dimensional Change: After aging, the material will shrink slightly, approximately 0.001 in/in.

4. Precautions
– Temperature Control: The temperatures of the solution and aging treatments must be strictly controlled to ensure optimal material properties.
– Cooling Rate: The cooling rate after solution treatment has a significant impact on material properties. Rapid cooling helps achieve a fine grain structure, thereby improving toughness.
– Repeated Aging: काही प्रकरणांमध्ये, multiple aging treatments may be necessary to further optimize material properties.

Through this heat treatment process, the A286 key locking insert achieves excellent high-temperature strength, corrosion resistance, and good processing properties, meeting the application requirements of demanding fields such as aerospace.