فولادهای زنگ نزن آستنیتی نیکل پایین Low Nickel Austenitic Stainless Steels

Low Nickel Austenitic Stainless Steels 

فولادهای  زنگ نزن آستنیتی نیکل پایین

ABSTRACT

The most common grades of stainless steel are 304 and 316, which are particularly popular because  their austenitic microstructure results in an excellent combination of corrosion resistance, mechanical  and physical properties and ease of fabrication.  The austenitic structure is the result of the addition of approximately 8-10% nickel. Nickel is not alone  in being an austenite former; other elements that are used in this way are manganese, nitrogen,  carbon and copper. 

 

اثرات نیتروژن و مس بر فولاد زنگ نزن آستنیتی

Effects of N and Cu on the precipitation and the creep life

of 316 L austenitic stainless steel at 650 °C

اثرات نیتروژن و مس بر رسوب و عمر خزشی فولاد زنگ نزن آستنیتی 316L در دمای650 سانتیگراد

ABSTRACT

N and Cu were incorporated in 316L austenitic stainless steel in order to improve the creep life at 650 °C and 700 °C with a stress range of 100–250 MPa. An increased amount of N in solid solution strengthened the matrix and suppressed the coarsening of M23C6 precipitates, which improved the creep life. Low stresses allowed Cu-added alloys to rupture after the precipitation of the Cu-rich phase, which strengthens the matrix. Therefore, the addition of Cu enhanced the creep life only under low stresses while the positive effect of Cu was inconspicuous under high stresses.