Effect of boron on the phase composition and properties of facings during abrasive wear

Conclusions

• 1. The addition of boron to high-carbon chromium facing alloys promotes formation of hypereutectic structures, increases the amount of the eutectic and changes its structure, alloys the basic phases and substantially increases their hardness, increases the structural and chemical heterogeneity of the facing metal and the zone of fusion due to formation of new phases and redistribution of alloying elements, and favors formation of martensite sections at the line of fusion.

• 2. The wear resistance of dies and punches of peat briquetting presses operating under conditions of abrasive wear and high contact loads is highest with the addition of 2–2.5% B to high-carbon chromium facings. The service life of dies and punches with a facing of the U26Kh25R3 type is 3–4 times higher than that of punches faced with T-590 electrodes.