5-8 September 2022
Wyndham Grand Salzburg Conference Center
Europe/Vienna timezone

Influence of cold rolling and post annealing on low-temperature gaseous nitriding of meta-stable and nitrogen-stabilized 304 austenitic stainless steel

8 Sep 2022, 09:00
Room 2

Room 2

Oral Presentation Thermochemical treatment (carburizing, carbonitriding, nitrocarburizing, nitriding) SURFACE ENGINEERING




AISI 304 austenitic stainless steel plates were austenitized in Ar or solution nitrided in 0.5 bar N2 gas at 1150 °C for 2 h. Both austenitized and solution nitrided conditions were cold rolled to different engineering strains by 10‒70 % thickness reduction. The most heavily deformed coupons were subsequently annealed at various temperatures for up to 1 hour. Gaseous nitriding of the deformed and the annealed steels was performed in ammonia/hydrogen gas mixtures at atmospheric pressure at different temperatures: 430 °C and 460 °C. The nitrided case was characterized with X-ray diffraction analysis, reflected light microscopy, electron microscopy and hardness testing. The influence of microstructural features as grain size and the deformation mode by martensite/twin formation and/or dislocation generation and dislocation glide, on the development of the nitrided case and microstructure of the expanded austenite zone is discussed.

Speaker Country Denmark

Primary authors

Bo WANG (DTU) Konstantin V. WERNER (Technical University of Denmark) Matteo VILLA (Technical University of Denmark) Thomas CHRISTIANSEN (Technical University of Denmark (DTU), Department of Mechanical Engineering) Marcel SOMERS (Technical University of Denmark)

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