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本文采用自由落程4.2米,最大冲击功35焦耳的落球式冲击疲劳试验机,对四种材质九种组织状态的(φ60mm磨球进行了冲击疲劳剥落抗力的试验。结果表明:马氏体固溶碳量低,残余奥氏体量少的高铬铸铁磨球具有最佳的冲击疲劳剥落抗力。随着残余奥氏体量增加,冲击疲劳剥落抗力显著降低;但奥氏体及索氏体基体或回火索氏体基体的磨球却具有良好的冲击疲劳剥落抗力。稀土中锰球铁冲击疲劳剥落抗力极低,不适宜作为磨球材料;马氏体球铁磨球由于强韧性配合好,而具有良好的冲击疲劳剥落抗力。
In this paper, a falling ball impact fatigue testing machine with free fall of 4.2m and maximum impact energy of 35 Joules was used to test the impact fatigue spalling resistance of φ60mm ball with nine kinds of materials in nine kinds of microstructures. The results show that the martensitic solid High chromium cast iron balls with low carbon content and low residual austenite have the best impact fatigue spalling resistance.With the increase of the retained austenite content, the impact fatigue spalling resistance is significantly reduced; however, austenite and sorbite The substrate or tempered sorbite matrix ball has good impact fatigue spalling resistance rare earth manganese iron ball impact fatigue spalling resistance is very low, not suitable as a ball material; martensitic nodular iron ball due to the combination of toughness Good, while having good impact fatigue spalling resistance.