用金相显微镜、定量金相、扫描电镜(SEM)、能谱分析(EDX)及 X 射线衍射(XRD)研究了 0%,4%,6%Ta(质量分数) 3 种成分的低 Cr 高 W 铸造镍基高温合金铸态及热暴露后的显微组织,结果表明:Ta 是强 MC 碳化物形成元素,它形成 MC 碳化物的倾...用金相显微镜、定量金相、扫描电镜(SEM)、能谱分析(EDX)及 X 射线衍射(XRD)研究了 0%,4%,6%Ta(质量分数) 3 种成分的低 Cr 高 W 铸造镍基高温合金铸态及热暴露后的显微组织,结果表明:Ta 是强 MC 碳化物形成元素,它形成 MC 碳化物的倾向低于 Nb、高于 Ti,当合金中 Ta 的原子百分含量超过 Nb 3 倍时,Ta 在 MC 碳化物中的原子百分含量超过 Nb。Ta 是强γ′形成元素,它促进共晶γ′的形成,在合金成分中以等量原子百分含量的 Ta 代替 Al 不会改变合金的共晶γ′数量。在高 W 铸造高温合金中 M6C 是比 MC 更加稳定的碳化物,Ta 的加入不能抑制 1 100℃,500 h 长时热暴露后 MC 完全转变为粒状或片状 M6C。MC 分解时释放的碳还促使α(W,Mo)+C→M6C 反应。对 Ni-1.5Cr-10Co-16W-2Mo-5Al-1Ti-1Nb 基础成分合金,其最佳的含 Ta 量为 4% (质量分数),而且含碳量应低于 0.07%(质量分数)。展开更多
The precipitation behavior of carbide in K416 B superalloy was investigated by means of creep measurement and microstructure observation. The results show that nanometer M6 C particles discontinuously precipitate in t...The precipitation behavior of carbide in K416 B superalloy was investigated by means of creep measurement and microstructure observation. The results show that nanometer M6 C particles discontinuously precipitate in the γ matrix or along the γ/γ′ interface of the alloy during high temperature tensile creep. Thereinto, the amount of fine M6 C carbide increases as creep goes on, and the coherent interfaces of M6 C phase precipitating from the γ matrix are {100} and {111} planes. The thermodynamics analysis indicates that the solubility of element carbon in the matrix decreases when the alloy is deformed by the axial tensile stress during creep, so as to cause the carbon segregating in the regions of stress concentration and combining with carbide-forming elements M（W, Co）, which promotes the fine M6 C carbide to precipitate from the γ matrix.展开更多
文摘用金相显微镜、定量金相、扫描电镜(SEM)、能谱分析(EDX)及 X 射线衍射(XRD)研究了 0%,4%,6%Ta(质量分数) 3 种成分的低 Cr 高 W 铸造镍基高温合金铸态及热暴露后的显微组织,结果表明:Ta 是强 MC 碳化物形成元素,它形成 MC 碳化物的倾向低于 Nb、高于 Ti,当合金中 Ta 的原子百分含量超过 Nb 3 倍时,Ta 在 MC 碳化物中的原子百分含量超过 Nb。Ta 是强γ′形成元素,它促进共晶γ′的形成,在合金成分中以等量原子百分含量的 Ta 代替 Al 不会改变合金的共晶γ′数量。在高 W 铸造高温合金中 M6C 是比 MC 更加稳定的碳化物,Ta 的加入不能抑制 1 100℃,500 h 长时热暴露后 MC 完全转变为粒状或片状 M6C。MC 分解时释放的碳还促使α(W,Mo)+C→M6C 反应。对 Ni-1.5Cr-10Co-16W-2Mo-5Al-1Ti-1Nb 基础成分合金,其最佳的含 Ta 量为 4% (质量分数),而且含碳量应低于 0.07%(质量分数)。
基金Projects(2010CB631200,2010CB631206)supported by the National Basic Research Program of ChinaProject(50931004)supported by the National Natural Science Foundation of China
文摘The precipitation behavior of carbide in K416 B superalloy was investigated by means of creep measurement and microstructure observation. The results show that nanometer M6 C particles discontinuously precipitate in the γ matrix or along the γ/γ′ interface of the alloy during high temperature tensile creep. Thereinto, the amount of fine M6 C carbide increases as creep goes on, and the coherent interfaces of M6 C phase precipitating from the γ matrix are {100} and {111} planes. The thermodynamics analysis indicates that the solubility of element carbon in the matrix decreases when the alloy is deformed by the axial tensile stress during creep, so as to cause the carbon segregating in the regions of stress concentration and combining with carbide-forming elements M（W, Co）, which promotes the fine M6 C carbide to precipitate from the γ matrix.
基金National Natural Science Foundation of China(51171116)Ministry of Science and Technology of the People's Republic of China(Grant No.2009DFB50350)+1 种基金Research Foundation of Education Bureau of Hubei Province,China(Grant No.Q20122304)Doctoral Starting up Foundation of Hubei Universityof Automotive Technology,China(Grant No.BK201205)
