Optimization of quenching process of high strength and toughness Q690D steel for construction machines

doi:10.13251/j.issn.0254-6051.2022.09.019

Abstract

Abstract: Effect of quenching temperature from 880 ℃ to 1100 ℃ on microstructure, original austenite grain size and impact property at -20 ℃ of the Q690D steel with 30 mm thickness was investigated by means of full-automatic phase transition equipment, optical microscope, scanning electron microscope and transmission electron microscope. The results show that when the quenching temperature is below 950 ℃, the average austenite grain size of the tested steel is less than 10 μm, with the increase of quenching temperature, the Nb, V, Ti microalloyed carbides dissolve and the impact absorbed energy at -20 ℃ increases gradually. When the quenching temperature increases from 950 ℃ to 1100 ℃, the impact absorbed energy at -20 ℃ of the tested steel decreases from the maximum value 150 J to 19 J, with the rapid growth of austenite grains. The optimum quenching process of the Q690D steel is 950 ℃×20 min, and then water cooling.

Key words: Q690D steel, quenching temperature, austenite grain, microstructure, impact property

CLC Number:

TG161

Ji Dejing, Yang Weiyu, Bai Yaqiong. Optimization of quenching process of high strength and toughness Q690D steel for construction machines[J]. Heat Treatment of Metals, 2022, 47(9): 108-112.

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