微量元素Si对K452镍基铸造高温合金组织和力学性能影响的研究
Effects of Trace Element Si on Microstructure and Mechanical Properties of K452 Ni-based Cast Superalloy
李宁 1孙士杰 2范世钢 2盛乃成 2李玉贵 3楚志兵 3侯桂臣 2周亦胄2
作者信息
- 1. 太原科技大学 材料科学与工程学院,山西 太原 030024;中国科学院金属研究所 师昌绪先进材料创新中心 辽宁沈阳 110016
- 2. 中国科学院金属研究所 师昌绪先进材料创新中心 辽宁沈阳 110016
- 3. 太原科技大学 材料科学与工程学院,山西 太原 030024
- 折叠
摘要
研究了Si元素含量对K452镍基铸造高温合金标准热处理态微观组织形貌、拉伸和持久性能的影响.通过OM、SEM和EDS等表征及力学性能测试,发现在K452镍基铸造高温合金中,Si的添加量对碳化物形貌和分布有很大影响.由于Si元素含量的提高,分布于晶界上的碳化物数量随之增多.Si对拉伸强度的影响和Si的添加多少有关,低于0.5wt%的Si对合金抗拉强度影响不明显,可是Si添加量大于1.0wt%时,合金的抗拉强度明显减小.合金在900℃/200 MPa条件下持久寿命随着Si含量的增加而显著降低.
Abstract
The effects of different Si additions on the microstructure,tensile properties and stress rupture properties of K452 Ni-based cast superalloy after standard heat treatment were studyied.Using OM,SEM,EDS and other experimental methods,the following results are obtained:in K452 Ni-based cast superalloy,the addition of Si has a great influence on the morphology and distribution of carbides.Due to the increase of Si content,the number of carbides distributed on the grain boundary increases.The effect of Si less than 0.5wt%on the tensile strength of the alloy is not obvious,but the tensile strength of the alloy decreases significantly when the amount of Si is greater than 1.0wt%.The stress rupture life of the alloy at 900℃/200 MPa decreases obviously with the increase of Si content.
关键词
高温合金/返回料/Si元素/组织/性能Key words
superalloy/revert material/Si element/microstructure/property引用本文复制引用
出版年
2024
NETL
NSTL
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