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痕量元素 Se 对 K4002 合金组织和性能的影响
Effect of Trace Se on the Microstructure andProperties of K4002 Superalloys
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- DOI:
- 作者:
- 刘东方 1，冯 微 1，马秀萍 1，张凤祥 1，李溪伦 2，孟 宇 1
LIU Dongfang1, FENG Wei1, MA Xiuping1, ZHANG Fengxiang1, LI Xilun2, MENG Yu1
- 作者单位:
- 1. 北京航空材料研究院股份有限公司 高温合金熔铸事业部，北京 100094；2. 中国航发北京航空材料研究院 熔铸中心，北京 100094
1. Division of Superalloy Melting & Casting, Baimtec Material Co., Ltd., Beijing 100094, China; 2. Center of Melting &Casting, AECC Beijing Institute of Aeronautical Materials, Beijing 100094, China
- 关键词:
- 热力学计算；痕量元素；K4002 合金；Se 元素；组织和性能
thermodynamic calculations; trace elements; K4002 superalloy; Se element; structure and properties
- 摘要:
- K4002 合金是目前广泛使用的一种镍基铸造高温合金， 其技术标准中对痕量元素 Se 含量未做控制要求。同时，已有研究表明 Se 对不同合金的影响规律不尽相同。为阐明元素 Se 对 K4002 合金组织和性能的影响，通过热力学软件计算了 K4002 合金的平衡析出相，并研究了痕量元素 Se 对 K4002 合金组织和性能的影响规律。 结果表明，K4002合金的主要平衡析出相为基体 γ 相、γ′相、M3B2 型硼化物、碳化物(MC 型、M6C 型和 M23C6 型)及少量的 Ni5Hf 相。 MC 型碳化物富集 Hf、Ta 元素，M23C6 型碳化物富集 Cr 元素，M6C 型碳化物主要富集 W 元素同时含有一定量的 Ni 和 Cr 元素，M3B2 型硼化物主要富集 W 元素同时含有一定量的 Cr 元素。 随 Se 含量的升高，K4002 合金的平均持久寿命呈现逐渐下降的趋势。 这是由于晶界处偏聚的 Se 元素不断增多并逐渐形成低熔点相甚至是显微疏松，削弱了晶界的强度。K4002 alloy is a widely used nickel-based superalloy, and the trace element Se content is not controlled by itstechnical standards. Moreover, existing studies have shown that the effects of Se on different alloys are not the same. Todetermine the influences of Se on the structures and properties of the K4002 superalloy, the equilibrium precipitated phasesof the K4002 superalloy were calculated by thermodynamic software, and the effects of Se on the microstructure andproperties of the K4002 alloy were studied. The results show that the main equilibrium precipitates of the K4002 alloy arethe matrix γ phase, γ′ phase, M3B2 type borides, carbides (MC type, M6C type and M23C6 type) and a small amount ofthe Ni5Hf phase. MC-type carbides are enriched in Hf and Ta, M23C6-type carbides are enriched in Cr, M6C-type carbidesare mainly enriched in W and contain a certain amount of Ni and Cr, and M3B2-type carbides are mainly enriched in W andcontain a certain amount of Cr. With increasing Se content, the average durability life of the K4002 alloy decreasesgradually. This is due to the continuous increase in Se segregation at the grain boundaries and the gradual formation oflow-melting point phases and even microscopic pores, which weakens the strength of the grain boundaries. The Se contentin the K4002 alloy should be controlled below 3×10-6.