陈明松,秦刚华,蔺永诚,等.超超临界发电机组螺栓用镍基高温合金混晶组织均匀细化工艺[J].精密成形工程,2021,13(3):125-130.
CHEN Ming-song,QIN Gang-hua,LIN Yong-cheng,et al.Process for Refinement of Mixed Grain Microstructure of Deformed Ni-Based Superalloy for Bolts of Ultra Supercritical Generator Sets[J].Journal of Netshape Forming Engineering,2021,13(3):125-130. |
| 超超临界发电机组螺栓用镍基高温合金混晶组织均匀细化工艺 |
| Process for Refinement of Mixed Grain Microstructure of Deformed Ni-Based Superalloy for Bolts of Ultra Supercritical Generator Sets |
| 投稿时间：2021-04-29 |
| DOI：10.3969/j.issn.1674-6457.2021.03.015 |
| 中文关键词: 镍基合金 连续降温再结晶 均匀细化机制 力学性能 |
| 英文关键词: Ni-based superalloy continuous-cooling recrystallization annealing treatment grain refinement mechanism mechanical properties |
| 基金项目:国家自然科学基金(51775564，51975593);湖南省科技人才托举工程(2020TJ-Q05) |
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| 中文摘要: |
| 目的 消除典型镍基合金锻件中存在的严重混晶组织，从而提高锻件的力学性能。方法提出“低温δ相时效+高温连续降温退火”双级热处理工艺，研究该热处理工艺对混晶组织演变及高温性能的影响，揭示锻造混晶组织的均匀细化机制。结果 利用该工艺可以在提升再结晶形核速率的同时降低再结晶晶粒的生长速率，从而获得平均晶粒尺寸为5.82 μm的均匀细小的晶粒组织(达到ASTM12级)，并可保证合理的δ相残余含量。同时，晶粒组织的均匀细化使得合金的强度以及塑性等力学性能均较传统DA工艺得到较大的提升，其中650 ℃屈服强度较DA工艺提升了13.4%。结论 连续降温再结晶热处理工艺可以有效改善镍基高温合金锻件中的混晶状态，并显著提升合金的强度和塑性。 |
| 英文摘要: |
| Eliminating the deformed mixed and coarse grains in a Ni-based superalloy is necessary to improve the mechanical properties. A two-stage annealing treatment including an aging treatment and a subsequent continuous-cooling annealing treatment was proposed. The effects of the proposed two-stage annealing treatment on the microstructures and high-temperature mechanical properties were investigated. Also, the grain refinement mechanism was discussed. The results show that the annealing treatment can increase the recrystallization nucleation rate, but reduce the growth rate of recrystallized grains. Thereby, a fine and uniform grain structure with the average grain size of 5.82μm (ASTM12) was obtained. Moreover, the yield strength is increased by 13.4% compared with that of the sample treated by the traditional DA processing. Thus, the proposed two-stage annealing treatment can not only effectively refine deformed grains, but also improve mechanical properties of the hot deformed Ni-based alloy. |
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