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研究了含铬约28%、含钼约1%的高合金白口铸铁在不同热处理状态下的组织、硬度、磨粒磨损及腐蚀磨损性能。结果表明:热处理通过改变合金铸铁中二次析出相的物相、数量和大小而影响其组织性能。当800～850℃空冷时,二次相沿相界面析出,磨粒磨损与腐蚀磨损性能大大下降;900～950℃空冷,二次相在基体中细小弥散析出,奥氏体含铬量高,结构稳定。此时腐蚀磨损呈现最佳状态;1000～1050℃空冷,二次相大量析出,奥氏体空淬成马氏体,材料硬度大大提高,表现出良好的耐磨粒磨损性能。此时再进行500～600℃回火处理,高铬钼白口铸铁的磨粒磨损性能将进一步提高。
The microstructure, hardness, abrasive wear and corrosion and wear properties of high alloy white cast iron with about 28% chromium and about 1% molybdenum were studied under different heat treatment conditions. The results show that heat treatment affects the microstructure and properties of the alloy by changing the phase, amount and size of secondary precipitates. When the temperature is between 800 and 850 ℃, the secondary phase precipitates along the phase interface, and the abrasive wear and corrosive wear properties decrease greatly. When the temperature is between 900 and 950 ℃, the secondary phase precipitates finely and dispersively in the matrix. The austenite contains high chromium content, stable. At this time, the corrosion and wear showed the best condition. Air-cooled at 1000-1050 ℃ and large amount of secondary phase precipitated. Austenite was quenched into martensite and the hardness of the material was greatly improved. It showed good abrasive wear resistance. At this point and then 500 ~ 600 ℃ tempering, high chromium molybdenum white cast iron abrasive wear performance will be further improved.