Njira Zapamwamba Zochizira Kutentha Kwambiri Zopangira Zopangira | Shangdong Yueheng

Chithandizo cha kutentha chimayang'anira zokhala ndi magwiridwe antchito kuphatikiza moyo wa kutopa (mlingo wa L10), kukana kuvala, komanso kukhazikika kwa mawonekedwe. Kupanga kwamakono kumafunikira ± 3 ° C kuwongolera kutentha ndi Kuthekera kwa CPK≥1.33. Kutsatira koyambira: Spheroidizing Annealing → Kuthetsa → Kutentha Kwambiri → Kukhazikika.

1.Spheroidizing Annealing

Cholinga: Chotsani kupangira ma carbide network (≤Grade 2), pangani pearlite yofanana ndi spheroidized (carbide spheroidization ≥90%, m'mimba mwake 0.2-0.6μm), kuuma 179-207 HB. Njira ziwiri za protocol:

• Gawo 1: 790±10°C × 2-4h austenitization (kusungunuka kwa carbide)
• Gawo 2: 710 ± 10 ° C × 4-6h kuzizira pang'onopang'ono (≤20 ° C / h) mpaka 650 ° C, ankalamulira kuzirala pamapindikiraimalepheretsa mvula ya carbide

Zofunika kwambiriKukula kwambewu 7-8 (ASTM E112)

2.Quenching Njira

Kusamba kwa mchere (BaCl₂:KCl=3:1) kapena mpweya woteteza (N₂-CH₃OH, kafukufuku wa okosijeni ≤0.5%):

• GCr15 zitsulo: 845 ± 5 ° C × nthawi chinthu (khoma makulidwe × 0.8-1.2 min/mm)
• Kuzizira kinetics: 800→500°C kuzirala ≥45°C/s (peŵani kupanga ferrite), kuzizira pang'onopang'ono pansi pa 300°C
• Cholinga: Cryptocrystalline martensite (> 95%, kutalika kwa singano ≤0.02mm) + kusunga austenite (<5%)

3.Low-Kutentha Kutentha

150-180°C × 2-4h (±3°C) mkati mokakamiza convection mpweya ng'anjo:

• ε-Fe₂.₄C mvula mu martensite, kuuma 61-65 HRC
• Kuwola kwa Austenite:> 80% (XRD yotsimikizika)
• Chitsanzo chothandizira kupsinjika maganizo: σ_residual=σ_initial×e^(-0.02t) (t mu maola)

4.Njira Zapadera & Zatsopano

• Kudziletsa: 230±10°C kusamba mchere × 2h → m'munsi bainite (58-62 HRC, KCV≥50J/cm²)
• Deep Cryo: -70°C × 4h (kupopera kwa nayitrogeni wamadzimadzi), austenite→martensite kusintha>95%
• Kusintha kwa Laser: kutalika kwa 1064nm kumapanga kuya kwa 0.3mm, ↑40% kukhudzana ndi kutopa

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