S对铸造高温合金K417G凝固行为的影响  

Effect of S on Solidification Behavior of Cast Superalloy K417G

作　　者：杨亚倩 邢炜伟 丁磊磊 马颖澈[1,2] Yang Yaqian;Xing Weiwei;Ding Leilei;Ma Yingche(Shichang Xu Advanced Material Innovation Center,Institute of Metal Research,Chinese Academy of Sciences,Shenyang 110016,China;Key Laboratory of Nuclear Materials and Safety Evaluation,Chinese Academy of Sciences,Shenyang 110016,China)

机构地区：[1]中国科学院金属研究所师昌绪先进材料创新中心,沈阳110016 [2]中国科学院核用材料与安全评价重点实验室,沈阳110016

出　　处：《特殊钢》2024年第2期30-38,共9页Special Steel

摘　　要：在1340~1230℃采用等温凝固实验,研究了w[S]分别为0.0001%、0.0018%和0.0037%对K417G合金凝固特性的影响。结果表明,S降低合金的固相线温度,扩大固液两相区,当w[S]从0.0001%增加到0.0037%时,合金的固相线温度由1255℃降低至1245℃。在凝固过程中S元素偏析于液相,并在终凝区析出Y相,且S促进Al、Cr元素在固液界面处的富集。在相同等温温度下,S元素对MC碳化物和γ+γ’共晶的析出温度与形貌无明显影响,但S含量的增加促使MC碳化物、γ+γ’共晶和Y相数量的增加,且Y相的析出温度从1230℃提升至1240℃。The effects of 0.0001%,0.0018%and 0.0037%S content on the solidification characteristics of K417G alloy were studied by isothermal solidification experiment in the temperature range of 1340-1230℃.The results show that S can reduce the solidus temperature of the alloy and enlarge the solid-liquid two phase region.When the S content increases from 0.0001%to 0.0037%,the solidus temperature of the alloy decreases from 1255℃to 1245℃.During the solidification process,the S element segregates in the liquid phase and precipitates out as the Y phase in the final solidification zone.And S promotes the enrichment of Al and Cr elements at the solid-liquid interface.At the same isothermal temperature,the increase of S content promotes the increase of the volume fraction of MC carbide,γ+γ΄eutectic and Y phase,and has little effect on the morphology and precipitation temperature of MC carbide andγ+γ΄eutectic,but the precipitation temperature of the Y phase is increased from 1230℃to 1240℃.

关 键 词：S 等温凝固 K417G 元素偏析 Y相 

分 类 号：TG146[一般工业技术—材料科学与工程]