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采用金相显微镜和扫描电子显微镜对准Φ60 mm 40 Cr圆钢热顶锻开裂缺陷进行了检验和能谱分析。结果表明:铸坯皮下气泡在轧制过程中形成显微裂纹并扩展是导致顶锻开裂的主要原因,炼钢过程中充分脱氧,中间包开浇过热度小于45℃,保证中间包烘烤温度和时间,可以有效避免铸坯皮下气泡缺陷的产生。
The test of the hot forging cracking of Φ60 mm 40 Cr round bar by metallographic microscope and scanning electron microscope was conducted and the energy spectrum analysis was carried out. The results show that the formation of micro-cracks and expansion of submerged air bubbles in the slab during the rolling process are the main reasons leading to the cracking of the top forging. During the steel making process, the deoxidation is complete and the superheat of open-cast tundish is less than 45 ℃, And time, can effectively prevent the occurrence of sub-bubble defects.