Micrograph evidence of meniscus solidification and sub-surface microstructure evolution in continuous-cast ultralow-carbon steels

2006 ◽  
Vol 54 (4) ◽  
pp. 1165-1173 ◽  
Author(s):  
J. Sengupta ◽  
H.-J. Shin ◽  
B.G. Thomas ◽  
S.-H. Kim
Keyword(s):  
Microstructure Evolution ◽  
Carbon Steels ◽  
Surface Microstructure ◽  
Continuous Cast ◽  
Ultralow Carbon

Surface Microstructure Evolution Upon Silicidation of Ni(Pt) and the Different Responses to Metal Etch

2013 ◽  
Author(s):  
Wentao Qin ◽  
Dorai Iyer ◽  
Jim Morgan ◽  
Carroll Casteel ◽  
Robert Watkins ◽  
...  
Keyword(s):  
Thin Film ◽  
Oxide Film ◽  
Microstructure Evolution ◽  
Depth Profiling ◽  
Surface Microstructure ◽  
The Difference ◽  
Surface Microstructures ◽  
Pt Films

Abstract Ni(5 at.%Pt ) films were silicided at a temperature below 400 °C and at 550 °C. The two silicidation temperatures had produced different responses to the subsequent metal etch. Catastrophic removal of the silicide was seen with the low silicidation temperature, while the desired etch selectivity was achieved with the high silicidation temperature. The surface microstructures developed were characterized with TEM and Auger depth profiling. The data correlate with both silicidation temperatures and ultimately the difference in the response to the metal etch. With the high silicidation temperature, there existed a thin Si-oxide film that was close to the surface and embedded with particles which contain metals. This thin film is expected to contribute significantly to the desired etch selectivity. The formation of this layer is interpreted thermodynamically.

scholarly journals Austenite Reverse Transformation in a Q&P Route of Mn and Ni Added Steels

Metals ◽  
2020 ◽  
Vol 10 (7) ◽  
pp. 862 ◽  
Author(s):  
Maribel Arribas ◽  
Teresa Gutiérrez ◽  
Eider Del Molino ◽  
Artem Arlazarov ◽  
Irene De Diego-Calderón ◽  
...  
Keyword(s):  
Microstructure Evolution ◽  
Microstructural Characterization ◽  
Carbon Steels ◽  
Reverse Transformation ◽  
Low Carbon ◽  
Effective Mechanism ◽  
Low Carbon Steels ◽  
Heat Treated ◽  
Final Microstructure

In this work, four low carbon steels with different contents of Mn and Ni were heat treated by quenching and partitioning (Q&P) cycles where high partitioning temperatures, in the range of 550 °C–650 °C, were applied. In order to elucidate the effect of applying these high partitioning temperatures with respect to more common Q&P cycles, the materials were also heat treated considering a partitioning temperature of 400 °C. The microstructure evolution during the Q&P cycles was studied by means of dilatometry tests. The microstructural characterization of the treated materials revealed that austenite retention strongly depended on the alloy content and partitioning conditions. It was shown that the occurrence of austenite reverse transformation (ART) in the partitioning stage in some of the alloys and conditions was a very effective mechanism to increase the austenite content in the final microstructure. However, the enhancement of tensile properties achieved by the application of high partitioning temperature cycles was not significant.

Study on the surface microstructure evolution and wear property of bainitic rail steel under dry sliding wear

Wear ◽  
2020 ◽  
Vol 448-449 ◽  
pp. 203217 ◽  
Author(s):  
Yuda Chen ◽  
Ruiming Ren ◽  
Xiujuan Zhao ◽  
Chunhuan Chen ◽  
Rui Pan
Keyword(s):  
Microstructure Evolution ◽  
Sliding Wear ◽  
Rail Steel ◽  
Dry Sliding Wear ◽  
Surface Microstructure ◽  
Dry Sliding ◽  
Wear Property

Effects of Ni and Mn on brittle-to-ductile transition in ultralow-carbon steels

2017 ◽  
Vol 682 ◽  
pp. 370-375 ◽  
Author(s):  
Masaki Tanaka ◽  
Kenta Matsuo ◽  
Nobuyuki Yoshimura ◽  
Genichi Shigesato ◽  
Manabu Hoshino ◽  
...  
Keyword(s):  
Carbon Steels ◽  
Brittle To Ductile Transition ◽  
Ultralow Carbon

Twinning Behavior in Magnesium Alloys Processed by Laser Shock Peening

2019 ◽  
Author(s):  
Bo Mao ◽  
Yiliang Liao ◽  
Bin Li
Keyword(s):  
Mechanical Properties ◽  
Magnesium Alloys ◽  
Microstructure Evolution ◽  
Laser Intensity ◽  
Deformation Twinning ◽  
Mg Alloys ◽  
Laser Shock Peening ◽  
Surface Microstructure ◽  
Laser Shock ◽  
Shock Peening

Abstract In this paper, the surface microstructure evolution of an AZ31B magnesium (Mg) alloy during laser shock peening (LSP) was investigated. Particular attention was paid to the deformation twinning behavior, which plays an important role in the mechanical properties of Mg alloys. The effect of laser intensity on the twinning distribution was investigated. Twin-twin interactions during LSP process were characterized. The mechanism responsible for the formation of gradient twinning microstructure and twinning-induced hardening effect were discussed.

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