Abstract
The service life of the purging plug is one of the fundamental factors that determine the downtime and usage efficiency of the whole ladle. The creep behaviour of the purging plug was thus investigated to identify the possible failure mechanism. At first, the creep parameters of the Norton–Bailey strain hardening rule were inversely identified via the results of the creep test. Then, the thermal-solid coupling model approach was employed to predict the creep behaviour of the purging plug, in which the Norton–Bailey strain hardening rule was applied. The numerical results show that the temperature of the purging plug presents a cyclic trend after the first service period since the preheating temperature is lower than the temperature of molten steel. Furthermore, the distribution of the creep strain intensity in a layered form could also contribute to a gradual spalling of the purging plug end in service. Besides, the creep strain concentration around the slit can be responsible for the clogging of the purging plug.
Highlights
To satisfy the requirements of high-quality steel, secondary metallurgy is widely applied, which is often performed in a ladle furnace [1,2,3,4]
In service, the purging plug is periodically exposed to intense thermomechanical loads, which results from the collaborative impact of severe thermal shock due to blowing gas and molten steel, external mechanical constraints, and thermal expansion of its materials [8,9,10]
The Norton–Bailey strain hardening/softening formulation was adopted to account for the creep behaviour of the purging plug material in the present study, of which the creep strain rate is a function of stress, creep strain and temperature: e_cr 1⁄4 C1rC2 eCcr3 eÀC4=T
Summary
To satisfy the requirements of high-quality steel, secondary metallurgy is widely applied, which is often performed in a ladle furnace [1,2,3,4]. The thermal-solid approach was employed to predict the creep behaviour of the purging plug during service, where the Norton–Bailey strain hardening law was taken into account. In this case, 9.5 9 105 hexahedron elements were assigned to the purging plug with rectangular slits, meeting the demands of grid independence. For calibrating the above-mentioned boundary setting, the experimental device present in our previous research was designed [27]
Sign-in/Register to view highlights & summary Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
