摘要
利用电子探针等手段研究了不同Ti含量对DZ68合金凝固过程和偏析的影响。结果表明,随合金中Ti含量的增加,合金的初凝温度和终凝温度逐渐降低,凝固温度区间逐渐增大。当Ti含量达到0.55%～1.7%之间的某一值时,铸态合金中出现(γ+γ′)共晶,并随Ti含量增加,(γ+γ′)共晶数量增加。随合金中Ti含量的增加,W的负偏析程度显著增加,Cr由正偏析元素逐渐转变成负偏析元素。在终凝前,随合金中Ti含量的增加,凝固前沿固体中的Ti含量随凝固温度下降的平均变化速率增加,而Cr含量随凝固温度下降的平均变化速率下降。
The influence of Ti content on the solidification and segregation process of DZ68 alloy was investigated by means of electronic probe micro analysis（EPMA） and optical microscope.The results show that the temperatures of initial solidification and final solidification decrease and the solidification temperature interval increases with the increase of content of Ti in the alloy.When the content of Ti is in range of 0.55%-1.7%,the（γ ＋ γ′） eutectic appears in the alloy and the amount of the eutectic increase with increase of the content of Ti.At the same time,with the increasing of Ti content,the negative segregation extent of W increases obviously and Cr turns from positive segregation element to negative segregation element.Before final solidification,with the increase of Ti content in the alloy,the Ti content in the front of solidified solid increases with increasing the average variation rate of the decreasing of solidification temperature while the content of Cr decreases with the decreasing of the average variation rate of the decrease of solidification temperature.
出处
《材料热处理学报》
EI
CAS
CSCD
北大核心
2010年第7期40-44,共5页
Transactions of Materials and Heat Treatment
基金
国家自然科学基金(50901077)
