粘结剂中加入镍、铬对辊环用硬质合金材质性能影响的研究

RESEARCH ON INFLUENCE OF Ni AND Cr ADDITIONS IN Co BINDER PHASE ON PROPERTIES OF CEMENTED CARBIDES USED FOR ROLLERS

对Ni、Cr在粘结Co相中的作用机理进行了探讨。结果表明:Ni、Cr能促使粘结Co相的高温稳定态ε(f.c.c.)相完全保留至室温而不发生向低温稳定态α(h.c.p.)相的转变。从而在改善合金韧性的同时,也有助于合金的耐热疲劳性能、耐蚀性能以及抗氧化性能的提高。此外,由于以固溶体方式存在的Cr在腐蚀介质中有钝化作用,使合金的耐蚀性能得到进一步提高。

The mechanism of the effect of Ni and Cr in Co binding phase has been discussed. The resuits have shown that Ni and Cr can promote the stabilizing state phase(f, c. c. )of Co binding phase at high temperature to remain at room temperature completely without transformation to stabilizing phase(h. c. p. )at low temperature with the results of improving ductility of alloy, and at the same time increase thermal fatigue corrosion and oxidation resistance. Furthermore, due to Cr dissolving in Co binder phase to form solid solution, Cr has a passivation effct in corrosive medium and the corrosion resistance of alloy can also be further improved.