【摘要】 通过光学显微镜，显微硬度、洛氏硬度、冲击及磨损试验，研究了不同回火温度对Cr23高铬铸铁组织和性能的影响。结果表明：随着回火温度的升高，Cr23高铬铸铁的硬度、冲击韧性和耐磨性均先升后降。经过950℃淬火+500℃回火处理的Cr23高铬铸铁，其磨损性能较950℃淬火+450℃回火处理的试样提高了39.9%。经过950℃淬火处理+450～550℃回火处理后，Cr23高铬铸铁冲击断裂均为脆性断裂，解理断口；经过950℃淬火+500℃回火处理的Cr23高铬铸铁具有最优的性能。更多还原

【Abstract】 The effects of different tempering temperatures on the microstructure and properties of Cr23 high chromium cast iron were studied by optical microscope, microhardness, Rockwell hardness, impact and wear tests. The results showed that the hardness, impact toughness and wear properties of Cr23 high chromium cast iron first increased and then decreased with the increase of tempering temperature. The wear property of Cr23 high chromium cast iron quenched at 950 ℃ and tempered at 500 ℃ was 39.9% higher than that quenched at 950 ℃and tempered at 450 ℃. After being quenched at 950 ℃ and tempered at 450-550 ℃, the impact fracture of Cr23 high chromium cast iron was brittle fracture and cleavage fracture. The Cr23 high chromium cast iron quenched at 950 ℃ and tempered at 500 ℃ has the best properties.更多还原