Effect of tempering on microstructure and properties of Cr alloyed layer prepared by high current pulsed electron beam on Cr4Mo4V steel

doi:10.13251/j.issn.0254-6051.2020.08.038

Abstract

Abstract: Microstructure evolution law of Cr alloyed layer prepared by electron beam on Cr4Mo4V steel with different tempering time and temperatures was studied. Effect of tempering process on the phase transformation of Cr alloyed layer was analyzed by means of XRD and TEM, and the hardness and corrosion resistance of tempered Cr alloyed layer were tested by nanoindenter and electrochemical workstation, respectively. The results show that nano-scale carbides precipitate in the alloyed layer during tempering process, results in the increase of the hardness. However, the carbides gradually coarsen and the hardness decreases as the tempering time and temperature increase. The reduction of Cr content caused by carbides precipitation leads to a decrease of corrosion resistance, however, which is still superior to the Cr4Mo4V steel matrix.

Key words: Cr4Mo4V steel, high current pulsed electron beam alloying, tempering, hardness, corrosion resistance

CLC Number:

TG162.83

Liu Zhaobing, Zhou Lina, Luo Dian, Li Xuewen. Effect of tempering on microstructure and properties of Cr alloyed layer prepared by high current pulsed electron beam on Cr4Mo4V steel[J]. Heat Treatment of Metals, 2020, 45(8): 194-198.

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