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本文研究了Ti、Si、Mn对一种作为涡轮盘材料的25Ni—15Cr型铁基高温合金的组织和力学性能的影响,当Ti含量大于3.2％时,γ′→η明显增多,且塑性显著下降,并有σ相析出。 Si是合金中不可避免的元素,当Si≥0.35％时,合金中出现G相,其分子式为(Ni_(0.861)Fe_(0.139))_(13)Ti_3Si_3,当Si含量比较高时,合金强度性能略有下降。 Mn也是合金中不可避免的元素,在该类合金中,Mn能明显地促进合金中的Laves相生成,并显著地降低该合金的热加工性能。对25Ni-15Cr型合金,当Ti高时,Mn的允许含量低,而Tι较低时,Mn的允许含量可适当放宽。
In this paper, the effect of Ti, Si and Mn on the microstructure and mechanical properties of a 25Ni-15Cr-based iron-based superalloy, which is used as a turbine disk material, was investigated. When the content of Ti is more than 3.2%, γ ’→ η obviously increases, Decline, and σ phase precipitation. Si is an unavoidable element in the alloy. When Si≥0.35%, the phase G appears in the alloy with the formula of (Ni_ (0.861) Fe_ (0.139)) _ (13) Ti_3Si_3. Performance decreased slightly. Mn is also an unavoidable element in the alloy in which Mn significantly promotes the Laves phase formation in the alloy and significantly reduces the hot workability of the alloy. For 25Ni-15Cr type alloy, when Ti is high, the allowable content of Mn is low, and when Tι is low, the allowable content of Mn may be suitably relaxed.