【作者】 孙彦辉； 高宇； 陈永； 吴国荣；

【Author】 Sun Yanhui~1,Gao Yu,~1 Chen Yong~2,Wu Guorong~2 (1.Metallurgical and Ecological Engineering school,University of Science and Technology Beijing,Beijing 100083,China;2.Panzhihua Iron and Steel Research Institute,Panzhihua 617000,China)

【机构】 北京科技大学冶金与生态工程学院； 攀枝花钢铁研究院；

【摘要】 本文针对含Nb、V、Ti的连铸板坯的热塑性变化以及析出相行为进行了研究,为控制铸坯表面裂纹提供理论指导。对连铸坯试样进行拉伸试验,并对断口进行分析,确定了三种钢号凝固脆性区、高温塑性区和低温脆性区的温度范围。在凝固脆性温度区间,发现晶粒间液相硫化物薄膜,这是铸坯内裂纹的根源。并指出控制铸坯温度防止第二相质点析出是防止铸坯表面网状裂纹的有效措施。更多还原

【Abstract】 This paper study on changes of thermoplastic and behavior of precipitate in continuous casting slab containing Nb,V,Ti.Providing theoretical guidance for controlling slab surface crack.Do a tensile test with a sample of continuous casting slab,and analysis on fracture.Determined the temperature range of solidification brittle zone,high temperature plastic zone and low temperature brittle zone for three steel grade.In solidification brittle zone,we found film of liquid sulfide in intercrystalline.This is the origin of internal crack in.Points out that controlling the temperature of casting slab in order to prevent second phase particles precipitated is the effective measures to avert surface net cracks.更多还原