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Study on thickness effects of low carbon steel in rapid cooling process / Nur Adjla Mohamad Hafizin

By:

Nur Adjla Mohamad Hafizin

Material type: Text

TextPublication details: Kuantan, Pahang : UMP, 2012Description: xviii, 89 p. : ill. (some col.) ; 30 cm. + 1 CD-ROMISBN:

THE0005914(Local)

Subject(s):

Dissertation note: Project paper (Bachelor of Mechanical Engineering (Manufacturing)) -- Universiti Malaysia Pahang - 2012 Abstract: Hot stamping is among the latest technology applied in sheet metal manufacturing. It is a combination of a forming and rapid cooling to produce stronger products with the creation of martensite inside the sheet metal components. To cope with a huge range of sheet metal that suitably used for hot forming process, this research investigates microstructure changes during the rapid cooling process of three different sheet metal thicknesses. The Low Carbon Steel specimens of 2, 4 and 6mm thick were heated in a furnace to austenite region before immediately quenched in water and normalized in air. During the process, cooling rates were measured with acquisition system. The quenched specimens were observed using metallurgical microscope. The results show that water quench produced martensite structures while air quench produced pearlite and ferrite structures. The 2mm specimen of water quench formed a higher percentage of martensite and compactly bonded structure compared to 4mm and 6 mm specimens’ structure. For the air quench, 2mm specimen formed finely dispersed pearlite and ferrite. However, the microstructure of 4mm and 6mm specimens’ shows coarse pearlite and ferrite with lower hardness surface.

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Holdings ( 2 )
Title notes ( 3 )

Holdings
Item type	Current library	Call number	Copy number	Status	Date due	Barcode
Final Year Report	UMPLIB PEKAN	TA479.C37 A35 2012 rs Bc. (Browse shelf(Opens below))	1	Not for loan		0000072649
Final Year Report	UMPLIB PEKAN	CD 6852 \| TA479.C37 A35 2012 rs Bc. (Browse shelf(Opens below))	1	Not for loan		0000072650

Project paper (Bachelor of Mechanical Engineering (Manufacturing)) -- Universiti Malaysia Pahang - 2012

Bibliography : p. 77-79

Hot stamping is among the latest technology applied in sheet metal manufacturing. It is a combination of a forming and rapid cooling to produce stronger products with the creation of martensite inside the sheet metal components. To cope with a huge range of sheet metal that suitably used for hot forming process, this research investigates microstructure changes during the rapid cooling process of three different sheet metal thicknesses. The Low Carbon Steel specimens of 2, 4 and 6mm thick were heated in a furnace to austenite region before immediately quenched in water and normalized in air. During the process, cooling rates were measured with acquisition system. The quenched specimens were observed using metallurgical microscope. The results show that water quench produced martensite structures while air quench produced pearlite and ferrite structures. The 2mm specimen of water quench formed a higher percentage of martensite and compactly bonded structure compared to 4mm and 6 mm specimens’ structure. For the air quench, 2mm specimen formed finely dispersed pearlite and ferrite. However, the microstructure of 4mm and 6mm specimens’ shows coarse pearlite and ferrite with lower hardness surface.