CAJ | 학술논문

采用Gleeble-3500获得了带Al-Si镀层硼钢板的流动行为，并与无镀层板进行比较；在光学显微镜下观察变形条件对表面镀层完整性的影响；在SEM下观察了带Al-Si镀层硼钢板试样的断口形貌。结果表明，带Al-Si镀层硼钢板的抗拉强度和伸长率在试验条件下均低于无镀层板的。热拉伸变形后，硼钢表面Al-Si镀层产生了大量的裂纹，其宽度和密度对变形温度和应变速率较敏感。镀层的开裂导致基体裸露并氧化，降低了镀层的粘附力。断口形貌观察显示镀层与基体具有较明显的成形性差异。可以通过奥氏体化调控Al-Si镀层中富铁韧性相的相转变来增强其成形性。
채용Gleeble-3500획득료대Al-Si도층붕강판적류동행위，병여무도층판진행비교；재광학현미경하관찰변형조건대표면도층완정성적영향；재SEM하관찰료대Al-Si도층붕강판시양적단구형모。결과표명，대Al-Si도층붕강판적항랍강도화신장솔재시험조건하균저우무도층판적。열랍신변형후，붕강표면Al-Si도층산생료대량적렬문，기관도화밀도대변형온도화응변속솔교민감。도층적개렬도치기체라로병양화，강저료도층적점부력。단구형모관찰현시도층여기체구유교명현적성형성차이。가이통과오씨체화조공Al-Si도층중부철인성상적상전변래증강기성형성。
Flow behavior of the Al-Si coated boron steel was investigated with Gleeble-3500, in comparison with the uncoated one. Effect of deformation conditions on the coating integrity was characterized by optical microscopy. Facture surfaces of the coated steels were inspected under SEM. Experimental results indicate that the ultimate tensile strength and ductility of the Al-Si coated boron steel are lower than those of the uncoated steel under test conditions. Extensive cracks occur in the coating after tensile tests;the width and density of cracks are sensitive to the deformation temperatures and strain rates. The bare substrate exposed between the separate coating segments is oxidized. Appearance of the oxide degrades the Al-Si coating adhesion. Remarkable difference between formability of the coating layer and the substrate is confirmed. The formability of the Al-Si coating could be optimized by controlling the phase transformation of the ductile Fe-rich intermetallic compounds within it during the austenization.