A Study On End Quench Process Of Carbon Steel Low Alloy Steel And Stainless Steel

Yoong , Thiam Long (2006) A Study On End Quench Process Of Carbon Steel Low Alloy Steel And Stainless Steel. Project Report. UTeM, Melaka, Malaysia. (Submitted)

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Abstract

The purpose of this study was identifying the effect of quenching process bases on their hardenability, microstructure and distortion profile of three different steels. Three experiments have carried out involving hardness test, distortion examination and microstructure analyze. Where the samples hardness profile across the bars uniformly show hardness decrease towards the center, which was due to the decrease in the cooling rate towards the center. Sample with fast cooling rate, the transformation from austenite to pearlite cannot occur and the new phase obtained by quenching was called martensite. Martensite was a supersaturated metastable phase and has body centered tetragonal Iettice (bet) instead of bee. After sample was quenched, it was usually very hard and strong but brittle. Martensite looks needle-like under microscope due to its fine lamellar structure. Therefore the quenched end with high cooling rate will have high hardness profile. The microstructural changes from martensite at the quenched end to ferritepearlite where far from quenched end were depend to the cooling rate. Each quench medium has different cooling rate, therefore different quench medium will showed a . different results to the samples.

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