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研究了S含量对高速车轮钢断裂韧性的影响.结果显示,适当提高车轮钢中的S含量,可以有效提高断裂韧性.对夹杂物的分析表明,S含量为0.001%(质量分数)的车轮钢中Al_2O_3和Al_2O_3+(Ca,Mg)O的氧化物夹杂相对较多,而MnS夹杂物较少.在相近的O含量水平下,将S含量从0.001%提高到0.006%,车轮钢中夹杂物形态发生变化,主要形成MnS包裹在Al_2O_3表面的复合夹杂物.断裂韧性的提高与夹杂物种类和形态的变化有关.应用镶嵌应力理论分析表明,MnS包裹在Al_2O_3表面后,相比于单独Al_2O_3夹杂物,可改善复合夹杂物周围的应力集中,从而改善断裂韧性.
The effect of S content on the fracture toughness of high-speed wheel steel was studied.The results show that the appropriate increase of S content in the wheel steel can effectively improve the fracture toughness.The analysis of inclusions shows that the wheel steel with S content of 0.001% (mass fraction) The inclusions in Al 2 O 3 and Al 2 O 3 + (Ca, Mg) O oxides are relatively more and the MnS inclusions are less, and the content of S increases from 0.001% to 0.006% at the similar O content. , The main inclusions are MnS inclusions on Al 2 O 3 surface.The improvement of fracture toughness is related to the types and morphologies of inclusions.According to the mosaic stress theory analysis, MnS inclusions on Al 2 O 3 surface are more stable than Al 2 O 3 inclusions , Can improve the stress concentration around the composite inclusions, thereby improving the fracture toughness.