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对由Cr5支承辊(锻后热处理态)截取的冲击试样进行不同回火温度的调质处理。运用扫描电子显微镜和洛氏硬度计对冲击后试样进行断口、金相显微组织(调质处理前后)的观察和硬度检测。结果表明,调质处理后试样的显微组织得到显著改善,与锻后热处理态相比,调质处理后组织中的碳化物更加细小,并且弥散分布于基体上;随回火温度的升高,碳化物有聚集粗化倾向;断口形貌由准解理和撕裂棱向韧窝过渡;冲击吸收能量升高,硬度降低。回火温度为540℃左右时,Cr5钢材料有较好的综合力学性能。
Impact test specimens cut by Cr5 backup rolls (forged heat treated state) were tempered at different tempering temperatures. Scanning electron microscope and Rockwell hardness tester were used to analyze the fracture surface and the microstructure (before and after quenching treatment) and the hardness of the specimen. The results show that the microstructure of the sample after quenching and tempering treatment has been significantly improved. Compared with the heat treatment after forging treatment, the carbide in the quenched and tempered structure is finer and dispersed in the matrix; with the tempering temperature rise High, carbide tend to aggregate coarse; Fracture morphology quasi-cleavage and tearing edge transition to the dimples; impact absorption energy increases, the hardness decreases. When the tempering temperature is about 540 ℃, Cr5 steel has better mechanical properties.