Micromechanical Characteristics of the Surface Layer of Metastable Austenitic Steel after Frictional Treatment

2021 ◽  
Vol 122 (8) ◽  
pp. 800-806
Author(s):  
R. A. Savrai ◽  
Yu. M. Kolobylin ◽  
E. G. Volkova
Keyword(s):  
Surface Layer ◽  
Austenitic Steel ◽  
Metastable Austenitic Steel ◽  
Frictional Treatment ◽  
Micromechanical Characteristics

scholarly journals Surface layer hardening of metastable austenitic steel – Comparison of shot peening and cryogenic turning

2020 ◽  
Vol 9 (6) ◽  
pp. 16410-16422
Author(s):  
Hendrik Hotz ◽  
Benjamin Kirsch ◽  
Tong Zhu ◽  
Marek Smaga ◽  
Tilmann Beck ◽  
...  
Keyword(s):  
Surface Layer ◽  
Austenitic Steel ◽  
Shot Peening ◽  
Metastable Austenitic Steel ◽  
Surface Layer Hardening ◽  
Cryogenic Turning

scholarly journals Influence of surface morphology on the very high cycle fatigue behavior of metastable and stable austenitic Cr-Ni steels

2018 ◽  
Vol 165 ◽  
pp. 20008 ◽  
Author(s):  
Annika Boemke ◽  
Marek Smaga ◽  
Tilmann Beck
Keyword(s):  
Phase Transformation ◽  
Surface Layer ◽  
Surface Morphology ◽  
Austenitic Steel ◽  
Grain Refinement ◽  
Fatigue Testing ◽  
Testing Machine ◽  
Metastable Austenitic Steel ◽  
Steel Aisi ◽  
Cryogenic Turning

The present study investigates conventional and cryogenically turned specimens of metastable austenitic steel AISI 347 and stable austenitic steel AISI 904L in the VHCF regime. The cryogenic turning process includes cooling by CO2 snow and generates a surface layer on the specimens of metastable austenitic steel, which is characterized by a phase transformation from paramagnetic fcc - austenite to ferromagnetic bcc - martensite and grain refinement. The stable austenitic steel retains its purely austenitic structure after cryogenic turning, but also shows grain refinement in the surface layer. The specimens with different surface morphology were cyclically loaded at ambient temperature using an ultrasonic fatigue testing system developed and built at the authors’ institute. The testing machine operates at frequencies of approx. 20 kHz to achieve high numbers of load cycles within a reasonable time. To avoid self heating of the specimen, the tests were performed in pulse-pause mode. All specimens were tested with a load ratio of R = -1. During cyclic loading, the metastable austenitic steel partially transformed from paramagnetic fcc - austenite to ferromagnetic bcc - martensite, while no phase transformation could be detected in the stable austenitic steel.

STRUCTURE OF THE AUSTENITIC STEEL SURFACE LAYER SUBJECTED TO COMPRESSION PLASMA FLOWS IMPACT

2020 ◽  
Vol 24 (3) ◽  
pp. 211-225
Author(s):  
Nikolai N. Cherenda ◽  
Vladimir V. Uglov ◽  
Yu. V. Martinovich ◽  
I. A. Betanov ◽  
Valiantsin M. Astashynski ◽  
...  
Keyword(s):  
Surface Layer ◽  
Austenitic Steel ◽  
Steel Surface ◽  
Plasma Flows ◽  
Compression Plasma Flows
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