热镀锌烘烤硬化钢板合金化退火过程中镀层表面合金相形成过程的研究  

Study on Alloy Phase Forming Process of Plating Surface during Alloying Annealing Process of Hot-dip Galvanized BH Steel Sheets

作　　者：黄先明[1] 刘立斌[1] 黄国幸[1] 贾兵然[1] 李俊[2] 张理扬[2] 

机构地区：[1]中南大学材料科学与工程学院,湖南长沙410083 [2]宝钢科技股份有限公司冷轧厂,上海200941

出　　处：《矿冶工程》2007年第5期73-76,共4页Mining and Metallurgical Engineering

摘　　要：对热镀锌烘烤硬化钢板进行了合金化处理,用扫描电镜观察合金化镀层表面的组织形貌,并用X射线衍射仪分析了镀锌层的表面相组成,对所研究的结果用相图计算进行了解释。研究表明,450℃时在合金化退火开始时间段镀层为η相,20 s左右部分ζ相长至镀层表面,30 s后表面主要为ζ相,随着退火时间的延长到300 s镀层大部分为δ相,不再发生相变,合金化结束;500℃时合金化过程基本与450℃一致,但退火3 s后表面就已出现少量的ζ相,而9 s后表面基本由δ相和ζ相混合组成,退火时间达到20 s后表面已完全为δ相;550℃时退化3 s后表面出现少量的δ相,到9 s后镀层几乎全部由δ相组成。Alloying treatment was conducted for the hot-dip galvanized BH （bake hardening） steel sheets. The microstructure of alloying plating surface was observed by scanning electron microscope and the surface phase constitution of galvanization coating was analyzed by X-ray diffraction. The results obtained were explained by the calculation of phase diagram. The results showed that at 450 ℃ the coating was η phase at the time stage of the beginning of alloying annealing, part ζ phase transformed to the coating surface about 20 s and the surface was mainly ζ phase after 30 s. As the annealing time prolonged to 300 s the plating was mostly δ phase and no phase transformation occured and alloying ended. At 500 ℃, the alloying process was consistent with that at 450 ℃, but a little ζ phase appeared on the surface after 3 s annealing and after 9 s the surface was mainly comprised of δ phase and ζ phase and after annealing time reached 20 s the surface was completely δ phase. At 550 ℃, a little δ phase appeared on the surface after 3 s annealing and the plating was almost completely comprised of δ phase after 9 s.

关 键 词：汽车用钢板 热镀锌板 合金化退火 相变 相图计算 

分 类 号：TG174.44[金属学及工艺—金属表面处理]