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激光立体成形Inconel 718镍基高温合金δ相析出规律

δ Phase Precipitation of Inconel 718 Ni-Based Superalloy Fabricated by Laser Solid Forming

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摘要

通过激光立体成形得到了Inconel 718合金沉积态和固溶态试样,研究了时效温度及时效时间对δ相尺寸、形貌和体积分数的影响。结果表明,沉积态试样δ时效处理时,δ相首先在枝晶间的Laves相周围以短针状的形态析出,不形成长针状的穿晶δ相;固溶态试样δ时效处理时,在890 ℃下长时间时效处理可形成穿晶的δ相,而950 ℃下时效处理时δ相只在晶界处以短棒状析出。固溶态试样δ相析出的孕育期延长,且时效结束后形成的δ相体积分数较小。沉积态和固溶态试样中δ相的析出表观激活能分别为1917 kJ·mol-1和1867 kJ·mol-1。

Abstract

The as-deposited and solution-treated Inconel 718 superalloy samples are fabricated by laser solid forming, and the influences of aging temperature and aging time on the size, morphology, and volume fraction of δ phases are investigated. The results show that as for the aging treatment of as-deposited samples, the δ phases precipitate around the interdendritic Laves phases with a short needle pattern, and there are no δ phases throughout grains with a long needle pattern. In contrast, as for a long time δ aging treatment of solution-treated samples, there occur δ phases throughout grains with a long needle pattern at 890 ℃, while for the aging treatment at 950 ℃, only the short-bar-like δ phases precipitate at grain boundaries. In addition, the incubation time of δ phase precipitation elongates, while the volume fraction of δ phases formed after aging treatment decreases. The apparent activation energies of δ phase precipitation for the as-deposited and solution-treated samples are 1917 kJ·mol-1 and 1867 kJ·mol-1, respectively.

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中图分类号:TG456.7

DOI:10.3788/cjl201845.1202009

所属栏目:激光制造

基金项目:国家自然科学基金(51565041,51865036)、江西省自然科学基金(20171BAB206004)、江西省教育厅科研项目(GJJ170581)、江西省研究生创新专项资金项目(YC2018-S364)

收稿日期:2018-03-15

修改稿日期:2018-05-15

网络出版日期:2018-08-24

作者单位    点击查看

刘奋成:南昌航空大学轻合金加工科学与技术国防重点学科实验室, 江西 南昌 330063
吕飞阅:南昌航空大学轻合金加工科学与技术国防重点学科实验室, 江西 南昌 330063
任航:南昌航空大学轻合金加工科学与技术国防重点学科实验室, 江西 南昌 330063
王晓光:南昌航空大学轻合金加工科学与技术国防重点学科实验室, 江西 南昌 330063
林鑫:西北工业大学凝固技术国家重点实验室, 陕西 西安 710072

联系人作者:刘奋成(fencheng999@163.com)

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引用该论文

Liu Fencheng,Lü Feiyue,Ren Hang,Wang Xiaoguang,Lin Xin. δ Phase Precipitation of Inconel 718 Ni-Based Superalloy Fabricated by Laser Solid Forming[J]. Chinese Journal of Lasers, 2018, 45(12): 1202009

刘奋成,吕飞阅,任航,王晓光,林鑫. 激光立体成形Inconel 718镍基高温合金δ相析出规律[J]. 中国激光, 2018, 45(12): 1202009

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