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研究了QPQ处理对合金灰铁耐磨性的影响。合金灰铁试样预先进行不同工艺的正火和回火处理以获得不同体积分数的铁素体,然后进行QPQ处理,工艺为:在580℃氮化3 h后再在370℃氧化30 min。金相检查表明,QPQ处理后的渗层主要由Fe2N和Fe3O4组成;随着合金灰铁中铁素体体积分数的增加,其渗层厚度增加。磨损试验表明,经过QPQ处理的合金灰铁试样的耐磨性显著高于淬火加低温回火试样的耐磨性;有氧化层的合金灰铁的耐磨性比仅有氮化层的耐磨性更高。
The effect of QPQ treatment on wear resistance of alloy gray iron was studied. The alloyed gray iron samples were subjected to normalizing and tempering in advance to obtain ferrite with different volume fraction, and then QPQ treatment was carried out, and the nitriding at 580 ℃ for 3 h followed by oxidation at 370 ℃ for 30 min. Metallographic examination revealed that the infiltrated layer after QPQ treatment mainly consisted of Fe2N and Fe3O4. With the increase of ferrite volume fraction, the thickness of the infiltrated layer increased. The wear test shows that the wear resistance of the alloyed gray iron sample after QPQ treatment is significantly higher than that of the quenched and low temperature tempered sample; the wear resistance of the alloyed gray iron with oxide layer is higher than that of the nitride layer Higher wear resistance.