TY - JOUR
T1 - Evolution of Ti-based nonmetallic inclusions during solution treatment of maraging 250 steel
T2 - Thermodynamic calculations and experimental verification
AU - Shmulevitsh, Mati
AU - Pinkas, Malki
AU - Weizman, Amir
AU - Frage, Nachum
N1 - Funding Information:
The authors wish to thank Shlomi Levi and Michael Amos for their help in the sample preparation. This work was supported by Grant No.151-05 from the Israeli Council of High Education and the Israeli Atomic Energy Commission.
PY - 2011/6/1
Y1 - 2011/6/1
N2 - The evolution of Ti-based nonmetallic inclusions in Maraging 250 steel, namely Ti(CxN1-x) and Ti4C2S 2, was investigated experimentally. Their stability in austenite also was analyzed by a thermodynamic analysis of the Fe-Ni-Ti-C-N-S system. It was established that the total concentration of the inclusions decreases from 0.024 pct to 0.008 pct after treatment at 1453 K (1180 °C) for 3 hours. The Ti4C2S2 inclusions completely dissolve in austenite at 1523 K (1250 °C) during 1 hour of treatment. The composition of the carbonitride inclusions is shifted toward higher TiN contents when they dissolve in austenite. Nitrogen-enriched titanium carbonitride inclusions are stable in austenite and their fraction may be reduced only by controlling nitrogen content in the steel. The experimental observations are in good agreement with the results of the thermodynamic analysis.
AB - The evolution of Ti-based nonmetallic inclusions in Maraging 250 steel, namely Ti(CxN1-x) and Ti4C2S 2, was investigated experimentally. Their stability in austenite also was analyzed by a thermodynamic analysis of the Fe-Ni-Ti-C-N-S system. It was established that the total concentration of the inclusions decreases from 0.024 pct to 0.008 pct after treatment at 1453 K (1180 °C) for 3 hours. The Ti4C2S2 inclusions completely dissolve in austenite at 1523 K (1250 °C) during 1 hour of treatment. The composition of the carbonitride inclusions is shifted toward higher TiN contents when they dissolve in austenite. Nitrogen-enriched titanium carbonitride inclusions are stable in austenite and their fraction may be reduced only by controlling nitrogen content in the steel. The experimental observations are in good agreement with the results of the thermodynamic analysis.
UR - https://www.scopus.com/pages/publications/79959505466
U2 - 10.1007/s11663-011-9486-5
DO - 10.1007/s11663-011-9486-5
M3 - Article
AN - SCOPUS:79959505466
SN - 1073-5615
VL - 42
SP - 550
EP - 556
JO - Metallurgical and Materials Transactions B: Process Metallurgy and Materials Processing Science
JF - Metallurgical and Materials Transactions B: Process Metallurgy and Materials Processing Science
IS - 3
ER -