Investigating the cooling rate of cane molasses as quenching medium for 0.61% C high carbon steels

Metallurgical & Materials Engineering

article

M. R. Dodo¹  E. T Dauda¹  M. A. Adamu² 

[1] Department of Metallurgical and Materials Engineering, Ahmadu Bello University Zaria;Department of Mechanical Engineering, Ahmadu Bello University Zaria

关键词: Martensite;    Quenching;    Cane Molasses;    Viscosity;    Cooling Rate;    High Carbon Steels;   

DOI  :  10.30544/139

学科分类：医学（综合）

来源: Association of Metallurgical Engineers of Serbia

【 摘 要 】

The effect of cooling rate of cane molasses as quenching medium for 0.61% C high carbon steels was investigated. Samples of high carbon steel were spheroidized annealed and then machined prior to the hardening process. Molasses solution of viscosity equals to that of engine oil was prepared by adding water. The samples were normalized and then austenitised at 800oC and soaked for 40 minutes and then quenched in water, engine oil, raw molasses and the prepared molasses solution. Cooling rate curves of all the quenching media used were developed. The highest cooling rate of 60oC/s was attained by the prepared molasses solution. Hardness of the test samples was evaluated. The test results obtained show that the highest hardness value (525 HVN) was obtained from the sample quenched in the prepared molasses solution. Microstructures of the various samples were analyzed using OM and SEM. In all the tests samples martensite structure was observed. It was observed that the prepared molasses solution has higher severity of quenching than that of engine oil but lower than that of water. The research showed that cane molasses can harden high carbon steel without cracking the component in the same way as engine oil, hence, molasses could be a very good alternative to engine oil for use as quenching medium.

【 授权许可】

CC BY