特种铸造及有色合金
特種鑄造及有色閤金
특충주조급유색합금
SPECIAL CASTING & NONFERROUS ALLOYS
2009年
7期
596-598
,共3页
自蔓延%交变磁场%微观结构%细化晶粒
自蔓延%交變磁場%微觀結構%細化晶粒
자만연%교변자장%미관결구%세화정립
SHS%Alternative Magnetic Field%Micro-structure%Grain Refinement
将交变磁场引入自蔓延反应,研究其对陶瓷层的相结构的影响,采用NiO作为添加剂进行对比试验.试验结果表明,交变磁场并不改变陶瓷层的相组成.显微结构分析表明,随着磁感应强度的增加,α-AI2O3的枝晶尺寸减小,形态逐渐向细小的等轴晶形态过渡,在磁感应强度为0.2 T时,出现等轴晶组织.NiO的加入增强了交变磁场的影响效果,在NiO加入量为0.4%时可以在0.1 T的磁感应强度下得到细小的等轴晶组织.
將交變磁場引入自蔓延反應,研究其對陶瓷層的相結構的影響,採用NiO作為添加劑進行對比試驗.試驗結果錶明,交變磁場併不改變陶瓷層的相組成.顯微結構分析錶明,隨著磁感應彊度的增加,α-AI2O3的枝晶呎吋減小,形態逐漸嚮細小的等軸晶形態過渡,在磁感應彊度為0.2 T時,齣現等軸晶組織.NiO的加入增彊瞭交變磁場的影響效果,在NiO加入量為0.4%時可以在0.1 T的磁感應彊度下得到細小的等軸晶組織.
장교변자장인입자만연반응,연구기대도자층적상결구적영향,채용NiO작위첨가제진행대비시험.시험결과표명,교변자장병불개변도자층적상조성.현미결구분석표명,수착자감응강도적증가,α-AI2O3적지정척촌감소,형태축점향세소적등축정형태과도,재자감응강도위0.2 T시,출현등축정조직.NiO적가입증강료교변자장적영향효과,재NiO가입량위0.4%시가이재0.1 T적자감응강도하득도세소적등축정조직.
Effects of alternative magnetic field on phase structure in ceramic layer of ceramic lined compound steel pipes fabricated by SHS were described, and NiO was added as additive to contrast. The results show that change of phase structure in ceramic layer can not be observed in alternative magnetic field. With in-creasing in magnetic flux intensity, size of α-Al2O3 is decreased, and morphology is gradually transformed into fine equiaxed grain structure. Effects of alterna-tive magnetic field are strengthened by adding NiO, which results in the refinement of grain size at a lower magnetic flux density.
