Effect of Process Parameters in Hot Press Forming Operation to Tensile Strength of Ultra High Strength Steel

The escalating issues on sustainable environment such as the necessity to reduce CO2 emission and fuel consumption including new regulations to improve the safety of passengers car had brought up the application of new innovative materials and manufacturing process in the automotive indus...

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Main Authors:	Mohd Zairulnizam, Mohd Zawawi, Nik Mohd Hafiz Aiman, Nik Haron
Format:	Article
Language:	English
Published:	Trans Tech Publications, Switzerland 2014
Subjects:	TJ Mechanical engineering and machinery
Online Access:	http://umpir.ump.edu.my/id/eprint/6095/ http://umpir.ump.edu.my/id/eprint/6095/ http://umpir.ump.edu.my/id/eprint/6095/ http://umpir.ump.edu.my/id/eprint/6095/1/fkp-2014-zairulnizam-Effect_of_process_parameters.pdf

id	oai:umpir.ump.edu.my:6095
recordtype	eprints
spelling	oai:umpir.ump.edu.my:60952015-03-03T09:28:09Z http://umpir.ump.edu.my/id/eprint/6095/ Effect of Process Parameters in Hot Press Forming Operation to Tensile Strength of Ultra High Strength Steel Mohd Zairulnizam, Mohd Zawawi Nik Mohd Hafiz Aiman, Nik Haron TJ Mechanical engineering and machinery The escalating issues on sustainable environment such as the necessity to reduce CO2 emission and fuel consumption including new regulations to improve the safety of passengers car had brought up the application of new innovative materials and manufacturing process in the automotive industry called hot press forming operation. By using this new technique, the manufacturers can produce more lightweight and high strength car parts such as the B-pillars with tensile strength ranging from 1200MPa to 1600MPa. Hot press forming is done by rapidly heating up Ultra High Strength Steels (UHSS) made of boron steel material in a furnace to austenization temperature of about 950°C for 5 minutes, then transferred it quickly to the hot press die where rapid quenching occurred during the die closed with the aid of cooling channel. This experiment investigates the effects of varying combination of hot press forming parameters to final tensile strength of boron steel and had been carried out without use of cooling channel. The studied parameters are the air cooling time, cooling rate, cooling time in die and stamping pressure. The type of boron steel material with trade name of Usibor® 1500 was used as the test specimens while for punch and die material, High Thermal Conductivity Tool Steel (HTCS-150) made by Rovalma was used. Both are common materials used in the automotive industry for hot press forming operation. A preliminary experiment had been conducted where ten flat tensile strength specimens of Usibor 1500 were heated to the austenization temperature of 950°C and immediately quenched in a tank of water to confirm the material ability to achieve the minimum tensile strength of 1500Mpa. All specimens achieved average tensile strength of 1550Mpa in this most ideal cooling rate condition. In the experimental hot press forming operation, result shows that the flat blank specimens of Usibor 1500 able to obtain ultimate tensile strength of 1400Mpa after quenching in die without use of cooling channels when suitable process parameters were used during. Overall ,faster air cooling time, higher stamping pressure applied to the blank, and longer cooling time in die improve the cooling rate. Highest tensile strength of 1400Mpa was achieved in the experiment when cooling rate was 95°C/s, air cooling time of 3.83s, stamping pressure of 50bar and cooling time in die of 30s. Trans Tech Publications, Switzerland 2014 Article PeerReviewed application/pdf en http://umpir.ump.edu.my/id/eprint/6095/1/fkp-2014-zairulnizam-Effect_of_process_parameters.pdf Mohd Zairulnizam, Mohd Zawawi and Nik Mohd Hafiz Aiman, Nik Haron (2014) Effect of Process Parameters in Hot Press Forming Operation to Tensile Strength of Ultra High Strength Steel. Advanced Materials Research, 974. pp. 179-182. ISSN 1022-6680 (print), 1662-8985 (online) http://www.scientific.net/AMR.974.179 DOI: 10.4028/www.scientific.net/AMR.974.179
repository_type	Digital Repository
institution_category	Local University
institution	Universiti Malaysia Pahang
building	UMP Institutional Repository
collection	Online Access
language	English
topic	TJ Mechanical engineering and machinery
spellingShingle	TJ Mechanical engineering and machinery Mohd Zairulnizam, Mohd Zawawi Nik Mohd Hafiz Aiman, Nik Haron Effect of Process Parameters in Hot Press Forming Operation to Tensile Strength of Ultra High Strength Steel
description	The escalating issues on sustainable environment such as the necessity to reduce CO2 emission and fuel consumption including new regulations to improve the safety of passengers car had brought up the application of new innovative materials and manufacturing process in the automotive industry called hot press forming operation. By using this new technique, the manufacturers can produce more lightweight and high strength car parts such as the B-pillars with tensile strength ranging from 1200MPa to 1600MPa. Hot press forming is done by rapidly heating up Ultra High Strength Steels (UHSS) made of boron steel material in a furnace to austenization temperature of about 950°C for 5 minutes, then transferred it quickly to the hot press die where rapid quenching occurred during the die closed with the aid of cooling channel. This experiment investigates the effects of varying combination of hot press forming parameters to final tensile strength of boron steel and had been carried out without use of cooling channel. The studied parameters are the air cooling time, cooling rate, cooling time in die and stamping pressure. The type of boron steel material with trade name of Usibor® 1500 was used as the test specimens while for punch and die material, High Thermal Conductivity Tool Steel (HTCS-150) made by Rovalma was used. Both are common materials used in the automotive industry for hot press forming operation. A preliminary experiment had been conducted where ten flat tensile strength specimens of Usibor 1500 were heated to the austenization temperature of 950°C and immediately quenched in a tank of water to confirm the material ability to achieve the minimum tensile strength of 1500Mpa. All specimens achieved average tensile strength of 1550Mpa in this most ideal cooling rate condition. In the experimental hot press forming operation, result shows that the flat blank specimens of Usibor 1500 able to obtain ultimate tensile strength of 1400Mpa after quenching in die without use of cooling channels when suitable process parameters were used during. Overall ,faster air cooling time, higher stamping pressure applied to the blank, and longer cooling time in die improve the cooling rate. Highest tensile strength of 1400Mpa was achieved in the experiment when cooling rate was 95°C/s, air cooling time of 3.83s, stamping pressure of 50bar and cooling time in die of 30s.
format	Article
author	Mohd Zairulnizam, Mohd Zawawi Nik Mohd Hafiz Aiman, Nik Haron
author_facet	Mohd Zairulnizam, Mohd Zawawi Nik Mohd Hafiz Aiman, Nik Haron
author_sort	Mohd Zairulnizam, Mohd Zawawi
title	Effect of Process Parameters in Hot Press Forming Operation to Tensile Strength of Ultra High Strength Steel
title_short	Effect of Process Parameters in Hot Press Forming Operation to Tensile Strength of Ultra High Strength Steel
title_full	Effect of Process Parameters in Hot Press Forming Operation to Tensile Strength of Ultra High Strength Steel
title_fullStr	Effect of Process Parameters in Hot Press Forming Operation to Tensile Strength of Ultra High Strength Steel
title_full_unstemmed	Effect of Process Parameters in Hot Press Forming Operation to Tensile Strength of Ultra High Strength Steel
title_sort	effect of process parameters in hot press forming operation to tensile strength of ultra high strength steel
publisher	Trans Tech Publications, Switzerland
publishDate	2014
url	http://umpir.ump.edu.my/id/eprint/6095/ http://umpir.ump.edu.my/id/eprint/6095/ http://umpir.ump.edu.my/id/eprint/6095/ http://umpir.ump.edu.my/id/eprint/6095/1/fkp-2014-zairulnizam-Effect_of_process_parameters.pdf
first_indexed	2018-09-07T00:50:16Z
last_indexed	2018-09-07T00:50:16Z
_version_	1610907822637187072

Effect of Process Parameters in Hot Press Forming Operation to Tensile Strength of Ultra High Strength Steel

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