Abstract
In the paper transient nucleate boiling process is widely discussed. It’s unknown previously and investigated by author characteristics create a basis for designing of new technologies which allow receiving super strengthened materials. Obtained results are also used for appropriate software development to be widely applied for control of technological processes and cooling recipes design. A possibility of transition from real heat transfer coefficients (HTCs) to effective HTCs is discussed in the paper too. It is shown that core temperature of steel parts at the end of transient nucleate boiling (self-regulated thermal process (SRTP)) is a linear function of a part dimension when convective heat transfer coefficient during quenching in liquid media is fixed. Also, it is shown that effective Kondrtajev number Kn is a function of part size and convection intensity and is almost linear function for large sizes of steel parts. Surface temperature at the beginning of self-regulated thermal process and at its end is calculated depending on size and intensity of cooling. Based on obtained new results, it is possible to design DATABASE for liquid quenchants using standard Inconel 600 probe combined with the Liscic/Petrofer probe. Obtained results can be useful for engineers and software designers.
Highlights
Nobody knows how to use standard testing data to predict real quenching processes in heat treating industry and develop correctly cooling recipes for steel parts during hardening. It is explained by complicated problem which includes shock boiling, local and developed film boiling, transient nucleate boiling process and convection
Since during self-regulated thermal process surface temperature of steel parts changes insignificantly, the first type of boundary condition can be used for calculating core temperature at the end of transient nucleate boiling process
The main characteristics of self-regulated thermal process are: – duration of SRTP; – core temperature at the end of transient nucleate boiling process; – start surface self-regulation temperature and surface finish temperature of steel parts used for creation the first type of boundary condition; – average surface temperature during SRTP; – Effective Kondratjev number Kn within the transient nucleate boiling process
Summary
Nobody knows how to use standard testing data to predict real quenching processes in heat treating industry and develop correctly cooling recipes for steel parts during hardening. It is explained by complicated problem which includes shock boiling, local and developed film boiling, transient nucleate boiling process and convection. Taken into account these facts, authors [2, 5] received an analytical solution of heat conductivity equation (1) with the boundary condition (2), (3) and initial condition (4) which allows calculating duration of transient nucleate boiling process, Eq (6):.
Sign-in/Register to view highlights & summary Sign-in/Register to access full text options 
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.
