دراسة تأثير المعاملات الحرارية الكيميائية السطحية على الخواص الميكانيكية لفولاذ (40 Cr)‎

Abstract EN

This work deals with improvement of the mechanical properties of low alloy steel (DIN 40 Cr) using surface thermochemical heat treatments, Carbonizing, Nitriding, and Carbonitriding.

Carborizing processes were performed at 900–950 Cº for 3hrs.

Nitriding processes were performed at 570Cº for 1.5 hrs.

Carbonitriding processes were performed at 840 Cº for 3hrs.

Some specimens were oil quenched at 860 Cº followed by tempering at 500 Cº.

The microstructure, tensile, hardness, and impact tests were measured.

The results showed that Carbonizing, Nitriding, and Carbonitriding processes caused improvement of mechanical properties of low alloy steel.

However specimens that were subject to quenching and tempering had better mechanical properties than specimen that were subject to carbonizing, Nitriding, and carbonitriding.