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Acciaio bifasico
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ISBN10: 6200757674
ISBN13: 9786200757678
Publisher: Edizioni Sapienza
Published: Jul 26 2025
Pages: 80
Weight: 0.26
Height: 0.19 Width: 6.00 Depth: 9.00
Language: Italian
ISBN13: 9786200757678
Publisher: Edizioni Sapienza
Published: Jul 26 2025
Pages: 80
Weight: 0.26
Height: 0.19 Width: 6.00 Depth: 9.00
Language: Italian
Questo lavoro presenta la caratterizzazione microstrutturale e la valutazione delle proprietà meccaniche di un acciaio con diverse microstrutture bifasiche, ottenute mediante tempra da un acciaio ferritico-perlitico di grado LNE 500. La sua regione intercritica e le fasi esistenti, in funzione della temperatura, sono state determinate dal software THERMOCALC. Con questi risultati, i campioni sono stati temperati a partire da diverse temperature per ottenere varie frazioni volumetriche di ferrite e martensite. La caratterizzazione microstrutturale è stata effettuata mediante metallografia qualitativa e quantitativa. Le proprietà meccaniche sono state determinate mediante prove di durezza, impatto e trazione uniassiale, che hanno fornito parametri quali la tensione di snervamento, il limite di resistenza alla trazione e l'allungamento totale e uniforme, oltre all'esponente di incrudimento e al coefficiente di resistenza dell'acciaio trattato. I risultati hanno mostrato che i trattamenti termici di tempra hanno prodotto microstrutture diverse. La maggiore presenza della fase martensitica contribuisce a migliorare le proprietà meccaniche dell'acciaio temprato, come la durezza, l'energia assorbita dall'impatto e la resistenza meccanica senza perdita di duttilità .
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