Alloy 630 (17-7PH) steel plate exhibits distinctive hardening behavior through precipitation hardening (aging), which transforms its microstructure to achieve exceptional strength. Here's a detailed breakdown of its hardening performance:

I. Precipitation Hardening Mechanism

Solution Treatment (Condition A)

Heating to 1,040°C (1,900°F) dissolves alloying elements (e.g., aluminum, nickel) into austenite.

Rapid quenching (water/air) freezes this structure, forming a soft, ductile martensite (≤22 HRC).

Purpose: Prepare the material for forming or machining before hardening.

Aging (Precipitation Hardening)

Subsequent heating (aging) triggers the formation of nanoscale Ni₃Al precipitates within the martensitic matrix.

These precipitates impede dislocation movement, dramatically increasing strength and hardness.

II. Key Hardening Conditions & Properties

Condition	Aging Temperature	Tensile Strength (MPa)	Yield Strength (MPa)	Hardness (HRC)	Typical Applications
H900	470°C (880°F) × 1h	≥1,310	≥1,170	38–44	Aerospace fasteners, high-stress parts
H1025	510°C (950°F) × 1h	≥1,170	≥1,000	35–40	Springs, valves, structural components
H1150	595°C (1,100°F) × 4h	≥1,035	≥860	30–35	Welded s

 

 

 

 

 

 

 

 

 

 

 

 

 

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