CAJ | 학술논문

应用配有能谱仪的场发射扫描电镜分析了 A105钢中裂纹处及基体内残余元素 Cu、As和 Sn以及 P含量。应用Thermo-Calc热力学计算软件计算了A105钢的主要析出相以及钢液中P含量随固相质量分数变化关系。应用Gleeble 1500热模拟试验机对A105钢的高温热塑性进行了研究。发现P偏析是该钢产生横裂的主要原因，残余元素Cu、As和Sn在晶界的偏聚加剧了裂纹的形成，矫直温度偏低加速了裂纹的扩展，而裂纹的形成可能与AlN的析出无关，因为析出的AlN很少。
응용배유능보의적장발사소묘전경분석료 A105강중렬문처급기체내잔여원소 Cu、As화 Sn이급 P함량。응용Thermo-Calc열역학계산연건계산료A105강적주요석출상이급강액중P함량수고상질량분수변화관계。응용Gleeble 1500열모의시험궤대A105강적고온열소성진행료연구。발현P편석시해강산생횡렬적주요원인，잔여원소Cu、As화Sn재정계적편취가극료렬문적형성，교직온도편저가속료렬문적확전，이렬문적형성가능여AlN적석출무관，인위석출적AlN흔소。
The contents of tramp elements Cu, As and Sn as well as P in A105 continuous casting billets were analyzed by field emission scanning electron microscopy ( FESEM) equipped with energy dispersive spectrometry ( EDS) . Main precipitates in the steel and the variation of P content in molten steel with solid fraction were calculated by Thermo-Calc thermodynamic software. The hot ductility of the steel was measured by using a Gleeble 1500 thermal simulator. It is found that P segregation is the main reason for transverse cracking of the steel. The segregation of tramp elements Cu, As and Sn at grain boundaries promotes the formation of cracks. Straightening in a lower temperature zone accelerates crack propagation. AlN precipitation may have nothing to do with the formation of cracks due to little AlN.