Abstract
In an automotive industry, hot stamped, die quenched structural components have been widely used to provide extra protection against crash intrusion. Boron alloyed steel exhibit limited ductility, but it also promotes improvement in impact performance. This study analyzed the effect of cooling rate on the hardness and energy absorption. Self-quenched specimens were heated to 850°C and cooled in air of room temperature, water at room temperature and cold water. Vickers hardness test and tensile test was then carried out to analyze the effect of different quenching rate. Self-quenched specimens were compared to the properties of the die-quenched specimens obtained from commercial automobile body. Result shows that boron steel with the highest cooling rate has the highest value of hardness but low in strength.
Highlights
Steel manufacturers produce alloy boron steels that have undergone heat treatment, including quenching or quenching and tempering at low temperatures to attain high resistance to dynamic loads [1]
There are two types of testings that was conducted in this research which is the Hardness Test (Vickers) and Tensile Test
Both test conducted based on the ASTM
Summary
Steel manufacturers produce alloy boron steels that have undergone heat treatment, including quenching or quenching and tempering at low temperatures to attain high resistance to dynamic loads [1]. The adding of boron significantly increases the hardenability and strength of low and medium carbon steel was already observe in the year 1930s. The demand in automotive industry to reduce the vehicle weight while considering the safety have rapidly increase the manufacturing of lightweight body parts from ultrahighstrength steels (UHSS). The process of forming this ultrahigh-strength steel is limited by low formability and considerable spring back. To overcome this problem, boron has been used as an alloying element for alloy steel. When the strength is increased, the size of the steel can be decreased and the weight will become lighter
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