试样直径对膨胀法测定CCT曲线的影响  

Influence of specimen diameter on continuous cooling transformation curves determined by dilatation method

作　　者：刘香茹[1] 周旭东[2] 

机构地区：[1]河南科技大学物理与工程学院 [2]河南科技大学材料科学与工程学院,河南洛阳471003

出　　处：《金属热处理》2010年第6期84-87,共4页Heat Treatment of Metals

基　　金：河南省科技厅自然科学基金(0511050900)

摘　　要：利用膨胀法测定了Q235钢在不同直径条件下连续冷却的CCT曲线,并在金相显微镜上观察了试样的最终显微组织。结果表明,试样直径对膨胀法测定CCT曲线有明显影响,随着试样直径的增加,CCT曲线向右下方移动;试样直径对试样的最终组织形态没有显著影响。为了得到更准确的CCT曲线,建议试样直径介于3～6 mm之间。The continuous cooling transformation（CCT）curves of steel Q235 with the different diameter of specimen were determined by dilatation method.The microstructure of the specimen were observed by scanning electron microscopy（SEM）.The results show that the influence of the specimen diameter on CCT curves is marked;as specimen diameter increases,the CCT curves shift to right below;there is no obvious influence of the the specimen diameter on the final microstructure of the steel.In order to obtain precise CCT curves,the diameter of the specimen should be chosen in the range of 3 mm and 6 mm.

关 键 词：热模拟 CCT曲线 膨胀法 试样直径 显微组织 

分 类 号：TG151.2[金属学及工艺—热处理]