Prediction of heat treatment parameters and thermophysical properties of Q1100 high strength steel for construction machinery

doi:10.13251/j.issn.0254-6051.2021.06.034

Abstract

Abstract: Equilibrium phase composition, continuous heating austenitizing (TTA) curve, continuous cooling transformation (CCT) curve, hardenability and thermophysical properties of the Q1100 high strength steel were simulated and predicted by using JMatPro 7.0 software. The results show that the austenitizing temperature Ac₁ is 713.3 ℃, Ac₃is 831.9 ℃. When the heating rate is 1000 ℃/s, the homogenization time for austenite is the shortest in the continuous heating process of the steel. In the process of continuous cooling, the yield strength, tensile strength, and hardness of the steel all increase with the increase of cooling rate. When the cooling rate is 100 ℃/s, the maximum hardness, yield strength and tensile strength reach 41.7 HRC, 1180 MPa and 1267 MPa, respectively. The density and young's modulus all increase with the decrease of temperature, while the thermal conductivity first decreases and then increases, and the specific heat capacity, Poisson's ratio and linear expansion coefficient all decrease with the decrease of temperature.

Key words: JMatPro simulation, Q1100 high strength steel, equilibrium phase, mechanical properties, hardenability, thermophysical properties

CLC Number:

TG142.1

Wang Yujing, Wu Guangliang. Prediction of heat treatment parameters and thermophysical properties of Q1100 high strength steel for construction machinery[J]. Heat Treatment of Metals, 2021, 46(6): 172-176.

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