碳化物抗氧化稳定性及其与基体的协同作用对Cr—Ni合金铸铁高温耐磨性的影响

通过改变Cr-Ni合金铸铁中共晶碳化物的抗氧化稳定性，在可控气氛高温磨料磨损试验机上研究了碳化物及其与基体的氧化协同性对合金耐高温磨料磨损能力的影响。结果表明：碳化物的抗氧化稳定性以及碳化物与基体的氧化大无畏同性对合金在大气气氛中的高温耐磨性起着重要的作用。在Cr-Ni合金铸铁中，碳化物在高温氧化气氛中将优先于合金基体发生氧化腐蚀，使合金的耐磨性得到极大损害，因此，使碳化物与合金基体在高温下保持协同的高温稳定性对合金的高温耐磨性非常有利。

Effect of Anti-oxidation Stability of Carbides and Its Synergism with Matrix on Wear Resistance of High Cr-Ni Alloy Cast Iron at Elevated Temperature

Through change the oxidation stability of the carbide, the influence of the stability of eutectic carbide and the cooperation of eutectic carbide and matrix on the abrasive wear resistance of high Cr Ni cast alloys at elevated temperature has been investigated. The high temperature abrasive wear test was carried out on a high temperature friction and wear test rig whose test atmosphere can be controlled. The chemical compositions of the oxidized alloy surface were determined with an energy dispersive X ray analyzer. The cross section morphologies of the worn surfaces of various alloys were observed with a scanning electron microscope. The results show that in atmosphere both oxidation stability of the carbide and the cooperation of carbide and matrix play a key role in the abrasive wear resistance. In usual Cr Ni alloy, the oxidation of the carbide is faster than that of the matrix and the cooperation of carbide and matrix is poor. Subsequently the abrasive wear resistance of the alloy was decreased. Thus it is important to realize optimized abrasive wear resistance of high Cr Ni cast alloys at elevated temperature by optimizing the cooperation of eutectic carbide and matrix.