Comparison of dry sliding wear behavior and microstructural properties of AISI 8620 steel after gas carburization, gas nitriding, and pack boronization surface treatments
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Tarih
2026
Dergi Başlığı
Dergi ISSN
Cilt Başlığı
Yayıncı
Walter De Gruyter Gmbh
Erişim Hakkı
info:eu-repo/semantics/closedAccess
Özet
AISI 8620 steel is used in gears and machine parts where surface wear resistance is important. The presented study focuses on different surface hardening treatments on microstructural properties and the dry sliding wear behavior of the AISI 8620 steel. The dry sliding wear test used a tribometer with constant wear test parameters according to ASTM G-99 standard. The microstructures were characterized by optical and scanning electron microscopy (SEM), energy-dispersive X-ray (EDX), and X-ray diffraction (XRD). The highest surface hardness (similar to 1,507 HV) occurs in the boronized sample, attributed to the hard, iron borides (FeB, Fe2B, Fe3B) layers. The minimum surface hardness (similar to 507 HV) is determined in nitrided samples. The maximum case hardening depth (similar to 0.90 mm) is obtained in nitrided samples, as the minimum value of case depth (similar to 0.1 mm) was found in boronized samples. The mean coefficient of friction was highest for nitrided (0.622) and lowest for boronized (0.367) samples. Boronizing also gave the minimum wear (1.705 mm3, 1 mg), compared with nitriding (13.5 mm3, 1.8 mg) and carburizing (43.57 mm3, 4.9 mg). The boronized samples exhibited the best wear properties. According to the optical profilometer results of worn samples; the carburized sample exhibits a broad and deep wear track (volume loss 43.57 mm3), indicating severe abrasive wear due to lower surface hardness, the boronized sample showed the narrowest and shallowest wear track (volume loss 1.705 mm3), because of superior wear resistance from the dense, hard iron boride layer while the nitrided sample having moderate wear depth and volume loss (13.5 mm3), indicating intermediate wear resistance attributed to a thinner, harder nitride layer providing moderate protection.
Açıklama
Anahtar Kelimeler
AISI 8620 steel, wear behavior, surface hardening, carburizing, nitriding, boronizing
Kaynak
Materials Testing
WoS Q Değeri
Q1
Scopus Q Değeri
Q2
Cilt
68
Sayı
1
