2006•Journal of Beijing Jiaotong UniversityRequires access
Nucleation Mechanism of Semi-Solid Microstructure in Low Alloy Steel Prepared by Liquidus Holding
Liming Xiao
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Abstract
The semi-solid slurry of low alloy steel was prepared by liquidus holding,in which fine,spherical and homogeneous microstructure was found.The nucleation mechanism of the microstructure and the influence of holding time,holding temperature and heat means on the microstructure were studied.Results showed that after holding at liquidus(1 510 ℃) a quantity of free nucleus which could refine and homogenize grains were formed in water quenched samples.Furthermore,the grain size of samples after liquidus holding was the smallest of dry quenched samples.In order to forming the free nucleus and keeping them,a shorter holding time(5 min) was needed because of electromagnetic stirring brought by medium-frequency induction.The microstructure of water quenched samples were not significant difference after holding 5 to 50 min at liquidus.