5、较多大小、形状、深浅不同的韧窝;从铸铁的断口微观形貌可以清晰地观察到铸铁的“河流”花样微观形貌。关键词:20#钢,铸铁,拉伸断裂行为,扫描电镜MetalmaterialtensilefracturebehaviorofstudyAbstract:In this paper, the measurement of the hardness and tensile fracture test have beendoneonthecastiron,heattreatmentof20#steelsmoothtensi
6、lesamplesandthenotch tensile samples.Through the determination of macro mechanical performance parameters and the observation of Material metallographic microstructure, the macro mechanical property when cast iron and 20 # steel are tensile are studied. Sca
7、nning electron microscopy, influence of gap to tensile performance of cast iron and 20 # steel in different heat treatment process is also considered.In conclusion, the process of normalizing and quenching can make the tensile property of 20 # steel larger.
8、 Especially, the hardness of 20 # steel after water quenching increases significantly. Moreover, plastic deformation of notch tensile samples mainly concentrates in the local area near the gap. Besides