谭军
,
李守新
,
袁金才
,
马禄铭
,
李依依
金属学报
doi:10.3321/j.issn:0412-1961.2002.01.007
利用透射电镜和铁素体仪研究了微量元素P,C,Si和Nb对采用均质化技术炼制的Nitronic 50奥氏体钢纽扣样品凝固微观组织中δ-铁素体析出量和凝固方式的影响.结果表明,在样品凝固微观组织中从初凝区到终凝区存在δ-铁素体析出含量的梯度分布,并且在初凝区中δ铁素体含量高于在终凝区的含量,微量元素含量及与其它元素在液体中的交互作用对δ-铁素体析出量有很大影响.在每一组样品中微量元素含量的变化将改变凝固微观组织中的凝固方式.
关键词:
微量元素
,
δ-铁素体
,
凝固方式
,
Cr-Ni-Mn-N钢
Wuxiao WANG
,
Bailing JIANG
,
Sen YUAN
,
Wanqi JIE
材料科学技术（英）
The liquid quenching method was adopted to study the solidification morphology and microstructure of AZ91D Mg alloy in semisolid. The results indicate that cooling rate has important effects upon the solidification structures. Under the cooling rate of liquid quenching, primary α-phase grows first by attaching on the original α grains, or independent nucleation and growth. The high cooling rate makes primary α-phase grow in "rags" or dendrite shape. Eutectic solidification is carried out in terms of both dissociated growth and symbiotic growth. The dissociated growth forms rough and large β-phase at grain boundaries, while symbiotic growth forms eutectic of laminar structure. The small liquid pool inside the original α-phase solidifies basically in the same way as that of intergranular liquid, but owing to less amount of liquid phase, the eutectic solidification is mainly carried out in the dissociated pattern.
关键词:
Magnesium alloy
,
液淬
,
凝固方式
,
凝固组织
谭军
,
李守新
,
袁金才
,
马禄铭
,
李依依
金属学报
利用透射电镜和铁素体仪研究了微量元素P,C,Si和Nb对采用均质化技术炼制的Nitronic 50奥氏体钢纽扣样品凝固微观组织中δ-铁素体析出量和凝固方式的影响.结果表明,在样品凝固微观组织中从初凝区到终凝区存在δ-铁素体析出含量的梯度分布,并且在初凝区中δ铁素体含量高于在终凝区的含量,微量元素含量及与其它元素在液体中的交互作用对δ-铁素体析出量有很大影响.在每一组样品中微量元素含量的变化将改变凝固微观组织中的凝固方式.
关键词:
微量元素
,
null
,
null
