摘要
对含铌、钛微合金船板钢酸洗表面形貌、拉伸断口形貌、试样表面及心部显微组织观察结果表明,含铌、钛船板钢心部裂纹的产生主要是由于P、S、O等杂质元素以及Nb、Ti元素在心部的偏析,生成的硫化物、氧化物以及Nb(C,N)、T(iC,N)引起应力集中现象。再加上钢坯连铸过程中H向表面和心部扩散,导致心部H含量较高产生氢脆,加剧裂纹的产生。
The surface morphology,tensile fracture morphology and the microstructure of Microalloyed Steel Ship Plate contained Nb,Ti were analysed. The result showed that the center crack of Ship Plate Steel contained Nb, Ti is mainly because of impurity elements such as P, S, O and Nb, Ti segregated to the center, and the stress concentration phenomenon was caused by sulfide, oxide and Nb （C, N） ,Ti （C, N） which generated. Moreover the H proliferated to the surface and the center in billet continuous casting process, leading to high content of H in the center and aggravated cracks.
出处
《金属世界》
2010年第2期32-33,43,共3页
Metal World
关键词
显微组织
裂纹
偏析
应力集中
microstructure
crack
segregation
stress concentration
