The influence of Low Temperature Carburizing (LTC) on the room- and high-temperature dry sliding tribological behaviour of AISI 316L was investigated and discussed along with microstructural modifications of the carburized layer (expanded austenite or S-Phase). The wear tests were carried out by a ball-on-disk testing device at temperatures up to 600°C, by using alumina balls as the counterface material. The significant hardness increase induced by the LTC treatment, due to S-phase formation, significantly enhanced the tribological behaviour of the AISI 316L at room temperature. However, the wear resistance of the LTC-treated steel strongly decreased with increasing temperature, becoming comparable to that of the untreated AISI 316L already at 150 °C. This tribological behaviour was related to the microstructural modification and consequent hardness decrease of LTC-treated surfaces exposed to high temperature. Themal stability of the S-phase was studied by static annealing in the temperature range 150-600 °C for 2 hrs. As shown by X-Ray Diffraction (XRD), temperature increase leads to carbon diffusion from the S phase to the matrix, with consequent weakening of the surface hardened layer. The high temperature involved in the sliding tests and further frictional heating induced by the tribological contact, contributes to enhance this phenomenon.

Rotundo, F., Ceschini, L., Martini, C., Montanari, R., Varone, A. (2014). High temperature tribological behaviour and microstructural modifications of the low-temperature carburised AISI 316L austenitic stainless steel. SURFACE & COATINGS TECHNOLOGY, 258, 772-781 [10.1016/j.surfcoat.2014.07.081].

High temperature tribological behaviour and microstructural modifications of the low-temperature carburised AISI 316L austenitic stainless steel

MONTANARI, ROBERTO;Varone, A.
2014-01-01

Abstract

The influence of Low Temperature Carburizing (LTC) on the room- and high-temperature dry sliding tribological behaviour of AISI 316L was investigated and discussed along with microstructural modifications of the carburized layer (expanded austenite or S-Phase). The wear tests were carried out by a ball-on-disk testing device at temperatures up to 600°C, by using alumina balls as the counterface material. The significant hardness increase induced by the LTC treatment, due to S-phase formation, significantly enhanced the tribological behaviour of the AISI 316L at room temperature. However, the wear resistance of the LTC-treated steel strongly decreased with increasing temperature, becoming comparable to that of the untreated AISI 316L already at 150 °C. This tribological behaviour was related to the microstructural modification and consequent hardness decrease of LTC-treated surfaces exposed to high temperature. Themal stability of the S-phase was studied by static annealing in the temperature range 150-600 °C for 2 hrs. As shown by X-Ray Diffraction (XRD), temperature increase leads to carbon diffusion from the S phase to the matrix, with consequent weakening of the surface hardened layer. The high temperature involved in the sliding tests and further frictional heating induced by the tribological contact, contributes to enhance this phenomenon.
2014
Pubblicato
Rilevanza internazionale
Articolo
Esperti anonimi
Settore ING-IND/21 - METALLURGIA
English
Con Impact Factor ISI
High temperature dry sliding, AISI 316L; Low Temperature Carburizing, ball-on-disk, XRD, Raman spectroscopy
Rotundo, F., Ceschini, L., Martini, C., Montanari, R., Varone, A. (2014). High temperature tribological behaviour and microstructural modifications of the low-temperature carburised AISI 316L austenitic stainless steel. SURFACE & COATINGS TECHNOLOGY, 258, 772-781 [10.1016/j.surfcoat.2014.07.081].
Rotundo, F; Ceschini, L; Martini, C; Montanari, R; Varone, A
Articolo su rivista
File in questo prodotto:
File Dimensione Formato  
High temperature tribological behaviour.pdf

solo utenti autorizzati

Licenza: Non specificato
Dimensione 3.44 MB
Formato Adobe PDF
3.44 MB Adobe PDF   Visualizza/Apri   Richiedi una copia

I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.

Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/2108/97446
Citazioni
  • ???jsp.display-item.citation.pmc??? ND
  • Scopus 26
  • ???jsp.display-item.citation.isi??? ND
social impact