Post-treatment of additively manufactured Fe?Cr?Ni stainless steels by high pressure torsion: TRIP effect

MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING

卷:811

Article

Heidarzadeh, Akbar¹  Neikter, Magnus²  Enikeev, Nariman^3,4  Cui, Luqing⁵  Forouzan, Farnoosh⁶  Mousavian, Reza Taherzadeh⁷ 

[1] Azarbaijan Shahid Madani Univ, Dept Mat Engn, Tabriz, Iran

[2] Univ West, Dept Engn Sci, S-46153 Trollhattan, Sweden

[3] St Petersburg State Univ, 7-9 Univ Skaya Nab, St Petersburg 199034, Russia

[4] Ufa State Aviat Tech Univ, K Marx 12, Ufa 450008, Russia

[5] Linkoping Univ, Dept Management & Engn, Div Engn Mat, SE-58183 Linkoping, Sweden

[6] Lulea Univ Technol, Dept Engn Sci & Math, SE-97187 Lulea, Sweden

[7] Dublin City Univ, Adv Mfg Res Ctr, I Form, Dublin 9, Ireland

关键词: Additive manufacturing (AM);    High pressure torsion (HPT);    Nanoindentation;    Electron back-scattered diffraction (EBSD);    Stainless steel;    Phase transformation (PT);   

DOI  :  10.1016/j.msea.2021.141086

来源: Elsevier

【 摘 要 】

High pressure torsion (HPT) at room temperature was used for post-treatment of additively manufactured Fe?Cr?Ni stainless steel with 12.9 wt % Ni as a very strong austenite stabilizer. The results showed that HPT caused a considerable increase in nanohardness of the additively manufactured samples. In contrast with thermodynamic equilibrium-state modeling, a phase transformation from FCC to HCP structure occurred, leading to the formation of ?-martensite during HPT on high angle boundaries, low angle boundaries, and dislocation cells with no detection of deformation twins. It was demonstrated that the combination of additive manufacturing thanks to the high density of dislocations after solidification and HPT process expands the opportunities of both methods to control deformation mechanisms in stainless steels leading to different phase and microstructural features. Thus, the outcome of this study provides a fundamental basis to design advanced structural materials.

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