Effect of chromium on microstructure and properties of alternating current field enhanced pack borided layer

doi:10.13251/j.issn.0254-6051.2020.02.046

Abstract

Abstract:

Alternating current field enhanced pack boriding (ACFEPB) was carried out for 45 steel at 750 ℃ with low boron potential boriding powder added with an appropriate amount of Cr powder, and the effect of Cr on the ACFEPB was studied. The microstructure, thickness, phases and microhardness of the borided layer were examined and analyzed by optical microscope, X-ray diffractometer and microhardness tester. The experimental results show that the borided layer obtained with the boriding powder containing 3% ferroboron is mainly saw-teeth-like Fe₂B phase. When the boriding powder is added with a very small amount of Cr powder, the maximum hardness remains almost unchanged, while when adding 0.2% Cr powder, the layer thickness increases and reaches the maximum which is about 80% increase compared with that without Cr addition. Along with further increase of the amount of Cr powder, the layer thickness decreases, and the maximum hardness of the borided layer starts to decrease when the amount of Cr powder is more than 3%. When the addition is ≥5%, various Cr-containing phases are also detected in the surface layer of the treated layer.

Key words: pack boriding, chromium powder, alternating current field, layer microstructure, microhardness

CLC Number:

TG156.8

Cheng Wei, Xie Fei. Effect of chromium on microstructure and properties of alternating current field enhanced pack borided layer[J]. HTM, 2020, 45(2): 235-238.

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