Optimization of the process route of seamless steel tubes to increase the mechanical - technological properties
Research output: Thesis › Master's Thesis
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Research output: Thesis › Master's Thesis
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TY - THES
T1 - Optimization of the process route of seamless steel tubes to increase the mechanical - technological properties
AU - Gruber, Christian
N1 - embargoed until 01-09-2023
PY - 2018
Y1 - 2018
N2 - An intermediate cooling of tube blanks after the push bench in the seamless tube production process shows increased mechanical-technological properties on the final product. An analysis on grain size and microstructure development and an evaluation of the occurring phenomena of possible precipitations are tested on three different steel grades of intermediate cooled samples in comparison to traditionally processed tubes. Furthermore, spray water quenched tube blanks are reviewed by means of an increase of productivity during intermediate cooling. A complete mechanical – technological profile of the different steel grades was built with included assessment on recrystallized fractions during deforming and precipitation effects on strength, toughness and grain size development. Also the influence of the varying austenite grain sizes on the CCT diagram and following on the phase transformation kinetics has been observed in detail. The results from the trials give a recommendation on the optimal process route for thermomechanical treated seamless tubes with a perfect initial state for rapid cooled AHSS advanced high strength steel tubes.
AB - An intermediate cooling of tube blanks after the push bench in the seamless tube production process shows increased mechanical-technological properties on the final product. An analysis on grain size and microstructure development and an evaluation of the occurring phenomena of possible precipitations are tested on three different steel grades of intermediate cooled samples in comparison to traditionally processed tubes. Furthermore, spray water quenched tube blanks are reviewed by means of an increase of productivity during intermediate cooling. A complete mechanical – technological profile of the different steel grades was built with included assessment on recrystallized fractions during deforming and precipitation effects on strength, toughness and grain size development. Also the influence of the varying austenite grain sizes on the CCT diagram and following on the phase transformation kinetics has been observed in detail. The results from the trials give a recommendation on the optimal process route for thermomechanical treated seamless tubes with a perfect initial state for rapid cooled AHSS advanced high strength steel tubes.
KW - nahtloses Rohr
KW - thermomechanisch
KW - mikrolegiert
KW - Phasenumwandlung
KW - ZTU
KW - Korngröße
KW - Kornwachstum
KW - Rekristallisation
KW - Austenit
KW - Ferrit
KW - Gefüge
KW - Festigkeitssteigerung
KW - Ausscheidungen
KW - Karbid
KW - Nitrid
KW - Karbonitrid
KW - seamless tube
KW - thermomechanical
KW - microalloy
KW - phase transformation
KW - CCT
KW - grain size
KW - grain growth
KW - recrystallization
KW - austenite
KW - ferrite
KW - microstructure
KW - strengthening mechanism
KW - precipitation
KW - carbide
KW - nitride
KW - carbonitride
U2 - 10.34901/mul.pub.2023.273
DO - 10.34901/mul.pub.2023.273
M3 - Master's Thesis
ER -