中国空气动力研究与发展中心 高速空气动力研究所,绵阳 621000
谢斌,男,1975年生,四川绵阳人,硕士,高级工程师;主要研究方向为风洞天平研制与应用;E-mail:13980128576@163.com。
徐志伟,男,1993年生,江西南昌人,硕士,工程师;主要研究方向为风洞天平研制与应用;E-mail:13657414872@163.com。
收稿:2024-12-20,
纸质出版:2026-02-15
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谢斌,向光伟,廖晓林,等. 18Ni(250)马氏体时效钢低温性能强化技术分析[J]. 机械强度,2026,48(2):151-158.
XIE Bin,XIANG Guangwei,LIAO Xiaolin,et al. Analysis of low-temperature performance strengthening technology of 18Ni(250)maraging steel[J]. Journal of Mechanical Strength,2026,48(2):151-158.
谢斌,向光伟,廖晓林,等. 18Ni(250)马氏体时效钢低温性能强化技术分析[J]. 机械强度,2026,48(2):151-158. DOI: 10.16579/j.issn.1001.9669.2026.02.018.
XIE Bin,XIANG Guangwei,LIAO Xiaolin,et al. Analysis of low-temperature performance strengthening technology of 18Ni(250)maraging steel[J]. Journal of Mechanical Strength,2026,48(2):151-158. DOI: 10.16579/j.issn.1001.9669.2026.02.018.
目的
2
针对低温风洞试验对超高强度与高韧性材料的需求,研究多次循环相变工艺对18Ni(250)钢组织演变与低温力学性能的影响规律。
方法
2
采用MeltFlow重熔工艺仿真软件构建了真空感应与真空自耗双联熔炼模型,分析了熔池内部微观结构形成机制,并优化工艺参数。制备试验钢后,依次进行了温度分别为940、900、860、820 ℃的多次循环相变处理与时效强化。
结果
2
研究结果表明,控制熔炼流速低于4.6 kg/min可显著降低偏析与夹杂,从而提高18Ni(250)钢的塑韧性。经多次循环相变处理后,原始奥氏体晶粒得到明显细化,其尺寸降至12 μm。所提工艺使材料在低温高载荷环境下表现出超高强度与高塑性相结合的优异力学性能。
Objective
2
This study aims to investigate the influence of multiple cyclic phase transitions on the micro-structure and low-temperature mechanical properties of 18Ni(250) ultra-high-strength steel to meet the stringent requirements of low-temperature wind tunnel tests.
Methods
2
An ultra-pure melting simulation model for vacuum induction and vacuum consumable smelting was constructed using MeltFlow software. The formation mechanism of the micro-structure inside the molten pool was analyzed and discussed. Based on the derived optimal parameters
the test steel was obtained through ultra-high-purity smelting. Subsequently
the steel was subjected to multiple cyclic phase transitions at 940 ℃
900 ℃
860 ℃ and 820 ℃
followed by conventional aging treatment.
Results
2
The results demonstrate that using a flow rate lower than 4.6 kg/min leads to an ingot with low segregation and low inclusions
which significantly improves the plastic toughness of 18Ni(250) steel. After undergoing the specific cyclic phase transitions
the original austenite grain size is notably refined to 12 μm. Consequently
the steel exhibits excellent mechanical properties under low-temperature and high-load conditions
characterized by the successful combination of ultra-high strength and high plasticity.
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