Effect of Processing Conditions on the Microstructure, Mechanical Properties, and Corrosion Behavior of Two Austenitic Stainless Steels for Bioimplant Applications

Effect of Processing Conditions on the Microstructure, Mechanical Properties, and Corrosion Behavior of Two Austenitic Stainless Steels for Bioimplant Applications

Hot torsion tests were carried out to simulate the industrial thermomechanical processing of two austenitic steels for bioimplant applications, namely ISO 5832-9 and ASTM F138. The former has Ti, Nb, and V in the composition, being N-rich. However, the latter is Ni-richer and without extra alloying...

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Bibliographic Details
Published in:Metals (Basel ) Vol. 10; no. 10; p. 1311
Main Authors: Silva, Mariana-Beatriz R., Roche, Virgine, Blanco, Telma M., Viet, Nguyen Hoang, Balancin, Oscar, Cabrera, José-María, Jorge, Alberto Moreira
Format: Journal Article
Language:English
Published: Basel MDPI AG 01-10-2020
MDPI
Subjects:
Alloying effects
Alloying elements
Austenitic stainless steels
Cooling
Corrosion effects
Corrosion resistance
Corrosion resistant steels
Corrosion tests
Crack initiation
Dynamic recrystallization
Engineering Sciences
Grain refinement
Grain size
Heating
interpass time
Materials
Mechanical properties
Metal fatigue
Microscopy
Microstructure
niobium
Orthopedics
Process parameters
reheating temperature
Schedules
Solid solutions
Stainless steel
Temperature
Thermomechanical treatment
Titanium
Torsion tests
Brazil
Czech Republic
Netherlands
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Summary:Hot torsion tests were carried out to simulate the industrial thermomechanical processing of two austenitic steels for bioimplant applications, namely ISO 5832-9 and ASTM F138. The former has Ti, Nb, and V in the composition, being N-rich. However, the latter is Ni-richer and without extra alloying element additions. Special attention was paid to the effect of interpass times, particularly to the soaking temperature, which was reduced to decrease processing times and costs. Optical and electron microscopy, corrosion tests, and hardness measurements were used to characterize the effect of the above processing parameters on both alloys. No significant increase in processing loads was noticed after the reduction of the reheating temperature. This was explained in terms of the balance between partial particles dissolution and the increment in the solute drag effect provided by the elements put into solution. Such an increment in solid solution favored the dynamic recovery process, delaying the dynamic recrystallization one. However, strain-induced precipitation took place at lower temperatures, by using the extra N and Cr delivered to the matrix, and limiting the recrystallization softening. The rolling schedule promoted abundant grain refinement. The final grain size ranged from 2.5 to 11 µm, depending on reheating temperature, interpass time, presence of alloying elements, and N. In general terms, the corrosion resistance of the ISO steel soaked at the lowest temperature (1200 °C) was better than when reheated to the highest one (1250 °C). On the contrary, the F138 steel had worse corrosion behavior.
ISSN:2075-4701
2075-4701
DOI:10.3390/met10101311