scholarly journals Transient Microstructure Evolutions and Local Properties of Dual-Phase 980 MPa Grade Steel Via Friction Stir Spot Processing

Materials ◽  
2020 ◽  
Vol 13 (19) ◽  
pp. 4406
Author(s):  
Koichi Taniguchi ◽  
Yong Chae Lim ◽  
Alexis Flores-Betancourt ◽  
Zhili Feng
Keyword(s):  
Mechanical Properties ◽  
Friction Stir Processing ◽  
High Strength Steels ◽  
Process Conditions ◽  
Dual Phase ◽  
Simple Material ◽  
Friction Stir ◽  
Nano Indentation ◽  
State Process ◽  
Grade Steel

Friction stir processing is a novel solid-state process to modify microstructures and their properties by intense, localized plastic deformation. However, little research has been reported for microstructure evolutions of advanced high-strength steels during the process. The present work focuses on the study of transient microstructure changes and local mechanical properties for friction stir spot processed dual-phase (DP) 980 MPa grade steel (DP980) under different peak temperatures. A pinless silicon nitride ceramic tool was used to produce relatively simple material deformation and flow near the tool. Friction stir spot processed steel samples were characterized by optical and electron microscopies. Furthermore, Vickers microhardness and nano-indentation measurements were used to study local mechanical properties for correlation with microstructures. A swallow layer of refined grains (<0.6 µm) was obtained with a low peak temperature (under 400 °C), whereas higher peak temperatures (>Ac1) led to a change in grain size with different microstructures (fine-grained DP or martensite). Electron back-scattered diffraction characterizations revealed a large deformation in the as-received microstructures (mixture of ferrite and tempered martensite) induced by friction stir spot processing, leading to recrystallization and grain refinement around the stirred zone. Also, nano-indentation measurements showed a higher hardness than the hardness of the as-received DP980. Friction stir processing with different process conditions effectively changed microstructures and local mechanical properties.

scholarly journals Effect of multi-pass friction stir processing on the microstructure and mechanical properties of dual phase steel

2018 ◽  
Vol 2018 (12) ◽  
pp. 140-144 ◽  
Author(s):  
T. Küçükömeroğlu ◽  
◽  
S.M. Aktarer ◽  
G. İpekoğlu ◽  
G. Çam ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Friction Stir Processing ◽  
Dual Phase Steel ◽  
Dual Phase ◽  
Friction Stir ◽  
Microstructure And Mechanical Properties

Enhanced Mechanical Properties of Stainless Steel 316 L via Friction Stir Processing

2010 ◽  
Vol 297-301 ◽  
pp. 215-220 ◽  
Author(s):  
R. Salekrostam ◽  
M.K. Besharati Givi
Keyword(s):  
Mechanical Properties ◽  
Stainless Steel ◽  
Friction Stir Processing ◽  
Composite Layer ◽  
Grain Structure ◽  
Sheet Metals ◽  
Stainless Steel 316L ◽  
Friction Stir ◽  
State Process ◽  
Stainless Steel 316

Friction stir processing (FSP) is a solid state process to modify microstructure and mechanical properties of sheet metals and as-cast materials. In this process stirring action of the tool causes the material to intense plastic deformation that yields a dynamical recrystalyzation. In this study the effect of FSP and process parameters on hardness, and microstructure of stainless steel 316L has been investigated. Also by using of FSP, a composite layer of 316L/SiC has been produced. Results show that FSP leads to a finer and homogenized grain structure, as well as increased hardness, strength, toughness, and elongation at failure of the material. The composites produced by FSP have a uniform distribution of SiC particles between the grains of the base metal.

Dispersion of Al2O3 Reinforcements in Al Composites via Friction Stir Processing

2016 ◽  
Vol 861 ◽  
pp. 236-240 ◽  
Author(s):  
Zheng Lin Du ◽  
Ming Jen Tan ◽  
Jun Feng Guo ◽  
Jun Wei
Keyword(s):  
Mechanical Properties ◽  
Grain Size ◽  
Solid State ◽  
Friction Stir Processing ◽  
Micro Hardness ◽  
Friction Stir ◽  
Grain Sizes ◽  
State Process ◽  
Uniform Dispersion ◽  
Disperse Reinforcement

Friction Stir Processing is a solid state process with the ability to modify microstructure and refine grain sizes of the material without melting and uniformly disperse reinforcement particles in the material matrix resulting in further improvements in the mechanical properties. In this study, it was used to disperse Al2O3 reinforcement particles of different sizes. Uniform dispersion of the reinforcements was achieved in the aluminium matrix with significant reduction in grain size were observed via SEM and EBSD. Improvement in Vicker’s micro hardness was observed after FSP.

SURFACE ENHANCEMENT AND IMPROVED MECHANICAL PROPERTIES OF SA-210 GR. A1 BOILER STEEL BY FRICTION STIR PROCESSING

2019 ◽  
Vol 7 (2) ◽  
pp. 49
Author(s):  
SINGH SUPREET ◽  
KAUR MANPREET ◽  
KUMAR MANOJ ◽  
SINGH HARPRABHJOT ◽  
SINGH NAVNEETINDER ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Friction Stir Processing ◽  
Boiler Steel ◽  
Surface Enhancement ◽  
Friction Stir

Enhanced mechanical properties of as-cast Mg-Al-Ca magnesium alloys by friction stir processing

2021 ◽  
Vol 296 ◽  
pp. 129880
Author(s):  
Zahra Nasiri ◽  
Mahmoud Sarkari Khorrami ◽  
Hamed Mirzadeh ◽  
Massoud Emamy
Keyword(s):  
Mechanical Properties ◽  
Magnesium Alloys ◽  
Friction Stir Processing ◽  
Friction Stir

scholarly journals Comprehensive Analysis of the Microstructure and Mechanical Properties of Friction-Stir-Welded Low-Carbon High-Strength Steels with Tensile Strengths Ranging from 590 MPa to 1.5 GPa

2021 ◽  
Vol 11 (12) ◽  
pp. 5728
Author(s):  
HyeonJeong You ◽  
Minjung Kang ◽  
Sung Yi ◽  
Soongkeun Hyun ◽  
Cheolhee Kim
Keyword(s):  
Mechanical Properties ◽  
Tensile Test ◽  
Joint Strength ◽  
Solid Phase ◽  
Welding Process ◽  
High Strength Steels ◽  
High Strength ◽  
Low Carbon ◽  
Friction Stir ◽  
Welding Processes

High-strength steels are being increasingly employed in the automotive industry, requiring efficient welding processes. This study analyzed the materials and mechanical properties of high-strength automotive steels with strengths ranging from 590 MPa to 1500 MPa, subjected to friction stir welding (FSW), which is a solid-phase welding process. The high-strength steels were hardened by a high fraction of martensite, and the welds were composed of a recrystallized zone (RZ), a partially recrystallized zone (PRZ), a tempered zone (TZ), and an unaffected base metal (BM). The RZ exhibited a higher hardness than the BM and was fully martensitic when the BM strength was 980 MPa or higher. When the BM strength was 780 MPa or higher, the PRZ and TZ softened owing to tempered martensitic formation and were the fracture locations in the tensile test, whereas BM fracture occurred in the tensile test of the 590 MPa steel weld. The joint strength, determined by the hardness and width of the softened zone, increased and then saturated with an increase in the BM strength. From the results, we can conclude that the thermal history and size of the PRZ and TZ should be controlled to enhance the joint strength of automotive steels.

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