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Microstructure Evolution of Low-alloy Bainite Wear-resistant Cast Steel with Rare Earth in Tempering Process
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School of Material and Metallurgy,Inner Mongolia University of Science and Technology,School of Material and Metallurgy,Inner Mongolia University of Science and Technology,Wuyang Iron and Steel Co Ltd of Hebei Iron and Steel Group,Wugang,School of Material and Metallurgy,Inner Mongolia University of Science and Technology,School of Material and Metallurgy,Inner Mongolia University of Science and Technology

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    Abstract:

    The cast samples of low-alloy bainite wear-resistant cast steel of 20MnCrNi2Mo with anthanum-cerium mischmetal were tempered at 200, 250, 300, 350, 400, 450, 500, 550, 600 and 650 ℃ respectively for 1 h. The microstructure was observed by QUANTA-400 environmental scanning electron microscope and JEM-2100 transmission electron microscope, the precipitation was qualitatively and quantitatively analyzed by using physicochemical phase analysis, and the retained austenite after different temperature tempering was measured quantitatively by D8 ADVANCE X ray diffracmeter. The microstructure evolution during the tempering was investigated. The results show that the microstructure of the tested steel as cast is granular bainite. The precipitated equilibrium-phase carbide during the tempering is alloying cementite with trace amount of solid-solution rare earth. The recovery has not been found during tempering at 500 ℃. The subgrains are found become distinctly and the recovery is observed clearly during tempering at 650 ℃. The M/A islands do not decompose tempered at 200 ℃, with the increase of the tempering temperature, the M/A islands gradually decompose, and the amount of the M/A islands decreases so obviously that it can not be detected when the tempering temperature is up to 450 ℃.

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[Ji Yunping, Ren Huiping, Hou Jingchao, Song Yanqing, Liu Xinhua. Microstructure Evolution of Low-alloy Bainite Wear-resistant Cast Steel with Rare Earth in Tempering Process[J]. Rare Metal Materials and Engineering,2018,47(4):1261~1265.]
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History
  • Received:April 05,2016
  • Revised:May 16,2016
  • Adopted:June 12,2016
  • Online: May 31,2018
  • Published: