Study of Microstructure and Mechanical Properties of Hot-Rolled Ultra-High Strength Ferrite-Bainite Dual Phase Steel

Abstract

Effects of thermo-mechanical control processing (TMCP) on microstructure and mechanical properties of hot-rolled ultra-high strength ferrite-bainite dual phase steel were investigated on a laboratory hot rolling mill. The results have shown that the microstructure containing ferrite and bainite can be obtained by TMCP. Ultimate tensile strength of all the specimens exceeded 1000MPa. Finish rolling temperatures affect the mechanical properties of ultra-high strength ferrite-bainite dual phase steel. Ultimate tensile strength reached 1078MPa at relatively low finish rolling temperature because of the ferrite grains refined. Fast cooling after low temperature rolling results in the ferrite grains refined and the formation of martensite islands. As a result, the product of ultimate tensile strength and total elongation (Rm×A50) of specimen 4 with fast cooling after low temperature rolling reaches the maximum value (18096MPa%).

Studi Variasi Suhu Tahan Pada Saat Proses Laku Panas Baja Paduan Berfasa Ganda Ni-Laterit

“…terdapat permasalahan menurunnya sifat kekuatan tarik setelah dipanaskan pada area fasa ganda, maka perlu dilakukan analisis lebih lanjut dalam optimalisasi sifat mekaniknya [6]. Pada Baja AISI yang dilakukan pemanasan temper setelah mencapai fasa ganda sedikit menurunkan kekerasan dan elongasi serta mampu dibentuk tempa panas maupun canai panas untuk keperluan aplikasi di industri tanpa mengalami cacat yang signifikan dan mampu menghasilkan fasa bainit yang cenderung memiliki ketangguhan yang baik [7].…”

Study on uniaxial tensile deformation of bainite/ferrite dual phase steel

“…It has high strength and toughness combination, high wear resistance and high fatigue resistance. It is widely used in bearings, frog and wheels [1][2][3][4]. The bainitic microstructure is usually obtained by isothermal transformation.…”