Application of powder boronizing to mechanical industry has been restricted because of the brittleness of boronized layer, which inevitably leads to decrease of service life of boronized parts. Therefore, attention sh...Application of powder boronizing to mechanical industry has been restricted because of the brittleness of boronized layer, which inevitably leads to decrease of service life of boronized parts. Therefore, attention should be paid to reducing the brittleness of boronized layer without decreasing its high hardness. In the present paper, a study on the effect of micro-addition rare earth and chrome on friction and wear behavior of boronized layer was carried out using an MM-200 wear test machine. Compared with that of pure single Fe2B phase, the brittleness of the boronized layer containing minim rare earth and chrome elements, obtained by powder RE-chrome-boronizing, is reduced, which results in increasing the bearing capacity and wear resistance of the boronized layer. The friction and wear mechanism is also briefly analyzed.展开更多
The mechanism of pack RE\|chrome\|boronizing and the effects of RE and Cr elements on the formation of RE\|chrome\|boroinized layer were studied by the aid of thermodynamic calculations and the layers compositions ana...The mechanism of pack RE\|chrome\|boronizing and the effects of RE and Cr elements on the formation of RE\|chrome\|boroinized layer were studied by the aid of thermodynamic calculations and the layers compositions analyses in this paper.The results show that boronizing plays a leading role in pack ER\|chrome\|boronizing because active RE and Cr atoms are obtained by reducing the solid materials,and then RE and Cr atoms dissolve in the RE\|chrome\|boronized layer,be fine and close (Fe,Cr,RE)\-2B phase in texture,by way of passing the grain boundary chiefly and replacement\|spreading separately.The spreading of RE and Cr atoms plays an important role in forming the fine columnar grains and decreasing surface\|layer voids of RE\|chrome boronized layer.展开更多
文摘Application of powder boronizing to mechanical industry has been restricted because of the brittleness of boronized layer, which inevitably leads to decrease of service life of boronized parts. Therefore, attention should be paid to reducing the brittleness of boronized layer without decreasing its high hardness. In the present paper, a study on the effect of micro-addition rare earth and chrome on friction and wear behavior of boronized layer was carried out using an MM-200 wear test machine. Compared with that of pure single Fe2B phase, the brittleness of the boronized layer containing minim rare earth and chrome elements, obtained by powder RE-chrome-boronizing, is reduced, which results in increasing the bearing capacity and wear resistance of the boronized layer. The friction and wear mechanism is also briefly analyzed.
文摘The mechanism of pack RE\|chrome\|boronizing and the effects of RE and Cr elements on the formation of RE\|chrome\|boroinized layer were studied by the aid of thermodynamic calculations and the layers compositions analyses in this paper.The results show that boronizing plays a leading role in pack ER\|chrome\|boronizing because active RE and Cr atoms are obtained by reducing the solid materials,and then RE and Cr atoms dissolve in the RE\|chrome\|boronized layer,be fine and close (Fe,Cr,RE)\-2B phase in texture,by way of passing the grain boundary chiefly and replacement\|spreading separately.The spreading of RE and Cr atoms plays an important role in forming the fine columnar grains and decreasing surface\|layer voids of RE\|chrome boronized layer.
