首页|大规格镍基高温合金轮盘长时时效对组织影响

大规格镍基高温合金轮盘长时时效对组织影响

扫码查看
镍基高温合金轮盘是燃气轮机关键部件,长时时效组织演化对轮盘服役寿命有较大影响.大规格轮盘镍基高温合金4725FC1 标准热处理后取样分别在 620℃/650℃温度下选用不同时间进行长时时效,最长10 000 h.研究表明:镍基高温合金 4725FC1 碳化物主要形式为MC型,碳化物尺寸小于 10 μm,在 620℃和650℃温度下10 000 h时效合金晶粒无明显变化,随时效时间增加,晶界上的δ相明显增多且呈现出连续化的趋势,同时晶内的针状δ相数量也增加;650℃下时效10 000 h后晶内会出现白色的富Nb、Cr、Mo元素相,会降低基体的固溶度进而影响合金的力学性能.长时时效一定程度上能增加合金的硬度,但是增加的幅度不大.
Effect of Long-term Aging on Microstructureof Large-sized Nickel-based Superalloy Disc
Nickel-based superalloy disk is a key component of gas turbine.The long-term aging microstructure evolution has a great influence on the service life of disk.After standard heat treatment,samples of large-sized nickel-based superalloy 4725FC1(with a composition similar to IN718)were taken and subjected to long-term aging at temperatures of 620℃/650℃for different durations,with a maximum of 10 000 hours.Research has shown that the main form of carbides in nickel-based superalloy 4725FC1 is MC type,and the size of carbide is less than 10 μm.The grain size of the alloy aged at 620℃and 650℃for 10 000 h has no obvious change.With the increase of aging time,the δ phase on the grain boundary increases significantly and shows a continuous trend,and the number of needle-like δ phases in the crystal also increases.After aging at 650℃for 10 000 h,white Nb-rich,Cr-rich and Mo-rich phase will appear in the crystal,which will reduce the solid solubility of the matrix and affect the mechanical properties of the alloy.Long-term aging can increase the hardness of the alloy to a certain extent,but the increase is not large.

IN718gas turbine disklong-term agingδ phase

江雷、颜家振、张晓林、高振桓、杨吉辉

展开 >

东方汽轮机有限公司 清洁高效透平动力装备全国重点实验室,四川 德阳 618000

四川大学 机械工程学院,四川 成都 610040

IN718 燃机轮盘 长时时效 δ相

2024

大型铸锻件
中国重型机械大型铸锻件行业协会 中国第二重型机械集团公司大型特锻件研究所

大型铸锻件

影响因子:0.098
ISSN:1004-5635
年,卷(期):2024.(6)