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Herein, the microstructure evolution and mechanical properties of the 40CrNiMo steel treated by different austempering temperatures are investigated. With the decrease in austempering temperatures from 270 to 180 °C, the volume fraction of bainite decreases, and the martensite fraction increases. The austenite content is about 8% at 270 °C, and then increases over 12% at 240≈180 °C. The mean grain...