Investigation of heat transfer coefficient during quenching in various cooling agents

•The highest HTC during quenching in mineral oils occur in temperature 520–550°C.•The peaks of HTC for polymers exist at lower temperature compared to mineral oils.•Temperature and utilization time of coolant affect the heat transfer coefficient.•Ageing of mineral oils affects their severities; a di...

Full description

Saved in:
Bibliographic Details
Published in:The International journal of heat and fluid flow 2013-12, Vol.44, p.358-364
Main Authors: Buczek, A., Telejko, T.
Format: Article
Language:English
Subjects:
Applied sciences
Boundary inverse heat conduction problem
Coolants
Exact sciences and technology
Finite element method
Hardening. Tempering
Heat transfer coefficient
Heat transfer coefficients
Heat treatment
Intervals
Mathematical models
Metals. Metallurgy
Mineral oils
Production techniques
Quenching
Quenching (cooling)
Citations: Items that this one cites
Items that cite this one
Online Access:Get full text
Tags: Add Tag
No Tags, Be the first to tag this record!
Description
Summary:•The highest HTC during quenching in mineral oils occur in temperature 520–550°C.•The peaks of HTC for polymers exist at lower temperature compared to mineral oils.•Temperature and utilization time of coolant affect the heat transfer coefficient.•Ageing of mineral oils affects their severities; a direction of change is equivocal. Heat transfer coefficients, HTCs, at the surface of a metal sample during immersion quenching were measured and evaluated using numerical procedures. The boundary inverse heat conduction problem has been defined and solved. A FEM self-developed computer code has been used to obtain a solution to the direct problem. The sensitivity of the method enabled us to examine the effect of various quenching parameters on the heat transfer for two mineral oils and a polymer quenchant. At 800°C the HTC values were equal to ∼0.5kW/(m2K) and ∼3.2kW/(m2K), for mineral oils and a polymer coolant, respectively. They increased to ∼4.7kW/(m2K) – oil A, ∼6.0kW/(m2K) – oil B and ∼7.4kW/(m2K) – polymer, respectively. The peak of HTC was sharp and occurred at a narrow temperature interval between 520 and 550°C for the oils, whereas for the polymer, the peak was lower by approx. 100K and flat over 100–120K interval. Subsequently HTC decreased, and at ∼150°C the values were ∼0.5kW/(m2K) and ∼2.0kW/(m2K), for mineral oils and a water polymer coolant, respectively.
ISSN:0142-727X
1879-2278
DOI:10.1016/j.ijheatfluidflow.2013.07.004