宽厚板
寬厚闆
관후판
Wide and Heavy Plate
2015年
4期
31-31
,共1页
角部裂纹%晶界%矫直温度%延展性
角部裂紋%晶界%矯直溫度%延展性
각부렬문%정계%교직온도%연전성
Corner crack%Grain boundary%Straightening temperature%Ductility
对天钢板坯角部裂纹进行研究分析，结果表明：铸坯凝固过程中晶界出现了 B（CN）和 AlN 等二相粒子聚集，同时，由于在铸坯初凝期奥氏体晶界生成铁素体膜，导致板坯角部区域的延展性显著降低。受二者的共同作用，当板坯通过矫直区时，受到矫直应力作用而产生裂纹。通过控制钢中氮含量、降低结晶器水量及二冷水量，提高铸坯角部的矫直温度，改善高温力学性能，使板坯角部裂纹得到有效控制。
對天鋼闆坯角部裂紋進行研究分析，結果錶明：鑄坯凝固過程中晶界齣現瞭 B（CN）和 AlN 等二相粒子聚集，同時，由于在鑄坯初凝期奧氏體晶界生成鐵素體膜，導緻闆坯角部區域的延展性顯著降低。受二者的共同作用，噹闆坯通過矯直區時，受到矯直應力作用而產生裂紋。通過控製鋼中氮含量、降低結晶器水量及二冷水量，提高鑄坯角部的矯直溫度，改善高溫力學性能，使闆坯角部裂紋得到有效控製。
대천강판배각부렬문진행연구분석，결과표명：주배응고과정중정계출현료 B（CN）화 AlN 등이상입자취집，동시，유우재주배초응기오씨체정계생성철소체막，도치판배각부구역적연전성현저강저。수이자적공동작용，당판배통과교직구시，수도교직응력작용이산생렬문。통과공제강중담함량、강저결정기수량급이랭수량，제고주배각부적교직온도，개선고온역학성능，사판배각부렬문득도유효공제。
The paper describes the investigation and analysis on corner cracks of Tiangang produced slab. The re-sults show that the second phase particles of B(CN)and AlN aggregate at grain boundary in process of strand solidifi-cation. Simultaneously,due to the ferrite film formed at ferrite grain boundary at initial solidification stage of strand,the ductility in the corner zone of slab significantly decreases. Under the joint functioning of the above two factors,the strand forms crack under the action of straightening stress when strand is withdrawn through the straightening zone. By means of controlling N content,reducing water flow of mould and secondary cooling zone,the straightening temperature at the strand corner is increased,high temperature mechanical properties improved as well,thus the corner crack of slab is effectively controlled.
