The Influence of Quenching Temperature on the Mechanical Properties of a Dual-Phase Steel with 0.094% C and 0.53% Mn

Abstract

In this article, the authors have analysed the influence of quenching temperature (TQ) on the mechanical properties of a dual-phase steel with 0.094 % C and 0.53% Mn. In order to obtain a ferrite-martensite structure, specimens of this material have been the subjected to intercritical quenching that consisted of heating at 750, 770, 790, 810 and 830 °C, maintaining for 30 minutes and cooling in water. These specimens have then been subjected to metallographic analysis and tensile test in order to determine the volume fraction of martensite (VM) in the structure, ultimate tensile strength (Rm), the 0.2% offset yield strength (Rp0.2), the total elongation (A5) and the Rp0.2/Rm ratio.

Technological Characteristics of a Dual-Phase Steel with 0.09% C and 1.90% Mn Obtained by Intercritical Quenching

“…In addition, specially prepared specimens were subjected to X-ray diffraction analysis through which were determined the carbon dissolved in martensite and the volume fraction of residual austenite. The results obtained from tests are presented in Table 3 [3,4,5]. Table 3.…”

“…The specimens and the tests to determine the influence of intercritical quenching on the mechanical properties of the dual-phase steel (DPS) were made according to the relevant standards [7,8]. The results are presented in Table 4 [4,5].…”

“…A ) and potential adjustment of thermal plants used; the time for maintaining at the heating temperature (t m ) was established at 30 minutes. The heat treatment was performed in a electrical furnace laboratory at 6 kW, powered with a voltage of 380 V. Cooling was done using both conventional cooling (water and oil) and unconventional (oil in DC magnetic field and oil in ultrasonic field), Table 2 [3,4,5]. For cooling in unconventional mediums two plants from "Heat Treatment Laboratory" at "Stefan cel Mare" University of Suceava were used.…”

“…Researches carried out at the "Stefan cel Mare" University of Suceava on cooling behaviour of DPS steel in the mediums above showed that [3,4] -all four cooling mediums ensure the conditions required to obtain ferrite-martensite structures;…”

Structures and Mechanical Properties of Some Dual-Phase Steels with Low Manganese Content

“…The dual-phase steels have been studied at the "Stefan cel Mare" University of Suceava since 1992, and over the years research has been conducted on several categories of alloys [3,25,27]. In recent years, studies have been carried out on dual-phase steels with low manganese content [26,[28][29][30]; in this article results obtained for two such alloys are presented.…”