Effects of The Tempering Temperature on Mechanical Properties of Dual Phase Steels

บทความในวารสาร

ผู้เขียน/บรรณาธิการ

กลุ่มสาขาการวิจัยเชิงกลยุทธ์

ไม่พบข้อมูลที่เกี่ยวข้อง

รายละเอียดสำหรับงานพิมพ์

รายชื่อผู้แต่ง: Sirinakorn, T.;Uthaisangsuk, V.;Srimanosaowapak, S.

ปีที่เผยแพร่ (ค.ศ.): 2014

วารสาร: Journal of Metals, Materials and Minerals (0857-6149)

Volume number: 24

Issue number: 1

หน้าแรก: 13

หน้าสุดท้าย: 20

นอก: 0857-6149

บทคัดย่อ

Dual Phase (DP) steels have been gradually used in the automotive industries because of theirdistinguished strength and ductility properties. Principally, microstructure of the DP steels contains definedamount of hard martensite islands dispersed in soft ferrite matrix. This microstructure characteristic andcorresponding mechanical properties of the DP steels with 35% martensite phase fraction can be adjusted byheat treatment. In this work, effects of tempering temperature and time on tensile properties of DP steelswere investigated. Continuous yielding behavior of tempered DP steels was observed up to around atemperature of 300ฐC. At higher tempering temperature, DP steels showed distinct increased yield point.Furthermore, ultimate tensile strength decreased and elongation increased, when the tempering temperatureand time were elevated. The investigated DP steel, which was tempered at 200บC for 60 minutes, exhibitedoptimal combination of strength and ductility. Additionally, stretch-flangeability of the DP steels wasexamined. Three types of hole manufacturing process, namely, drilling, blanking and wire cut, were takeninto account. It was found that formability of the DP steel sheets was significantly affected by quality of thehole edge. The samples prepared by wire cutting resulted in highest hole expansion ratio, since it caused theleast prior damage.

คำสำคัญ

Dual Phase steels, Tempering, Microstructures, Hole expansion test