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
杨亚倩(1991—),女,硕士,工程师;E-mail:yangyq@imr.ac.cn
马颖澈(1976—),男,博士,研究员,博士生导师;E-mail:ycma@imr.ac.cn
收稿:2023-10-27,
纸质出版:2024-03-30
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杨亚倩,邢炜伟,丁磊磊等.S对铸造高温合金K417G凝固行为的影响[J].特殊钢,2024,45(02):30-38.
Yang Yaqian,Xing Weiwei,Ding Leilei,et al.Effect of S on Solidification Behavior of Cast Superalloy K417G[J].Special Steel,2024,45(02):30-38.
杨亚倩,邢炜伟,丁磊磊等.S对铸造高温合金K417G凝固行为的影响[J].特殊钢,2024,45(02):30-38. DOI: 10.20057/j.1003-8620.2023-00217.
Yang Yaqian,Xing Weiwei,Ding Leilei,et al.Effect of S on Solidification Behavior of Cast Superalloy K417G[J].Special Steel,2024,45(02):30-38. DOI: 10.20057/j.1003-8620.2023-00217.
在1 340~1 230 ℃采用等温凝固实验,研究了
w
[S]分别为0.000 1%、0.001 8%和0.003 7%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0.000 1%增加到0.003 7%时,合金的固相线温度由1 255 ℃降低至1 245 ℃。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1 230 ℃提升至1 240 ℃。
The effects of 0.000 1%, 0.001 8% and 0.003 7% S content on the solidification characteristics of K417G alloy were studied by isothermal solidification experiment in the temperature range of 1 340-1 230 ℃. 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 0.000 1% to 0.003 7%, the solidus temperature of the alloy decreases from 1 255 ℃ to 1 245 ℃. 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 and γ+γ΄ eutectic, but the precipitation temperature of the Y phase is increased from 1 230 ℃ to 1 240 ℃.
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