摘要: |
导磁材料的磁性和膨胀性能对石英挠性加速度计的稳定性有重大影响,通过磁性测试仪、光学膨胀仪研究了不同热处理工艺对4J36合金的磁性能及线膨胀系数的影响作用。结果表明:不同热处理工艺下,合金组织均为奥氏体组织;而冷却速率对线膨胀系数和磁性能的影响作用是相反的,冷速较慢时,线膨胀系数变大,而合金初始磁导率和饱和磁感应强度会提高,合金磁性能提高。结合不同热处理状态下合金组织及性能发现,合金组织的稳定性和单一性避免了组织转变引起的体积变化,保证了线膨胀系数稳定性。除此之外,Fe原子运动状态及其自发磁化过程中的磁致伸缩也会保证合金线膨胀系数稳定性;影响磁性能的主要因素是保温时间和冷却速率,当延长保温时间和降低冷却速率时,磁性能有所提升。综合考虑,对于4J36合金的热处理工艺应选择固溶+时效+稳定+磁性退火。 |
关键词: 4J36合金;热处理;磁性能;线膨胀系数 |
基金项目:国家自然科学基金(61075030) |
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Effect of Heat Treatment on Linear Expansion Coefficient and Magnetic Properties of 4J36 Alloy |
Tong Xiongwei Zhang Kaiwang Shi Xintai Zhao Mikai Cui Kaifei Xu Yun Sun Chenglin
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Xi’an Aerospace Times Precision Electromechanical Co., Ltd., Xi’an 710100
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Abstract: |
The magnetic properties and expansion properties of magnetic permeable materials have great influence on the stability of quartz flexible accelerometer. The effects of different heat treatment processes on the magnetic properties and linear expansion coefficient of 4J36 alloy were studied by magnetic tester and optical dilatometer. The results show that the alloys are all austenitic structures under different heat treatment processes. The effect of cooling rate on the linear expansion coefficient and magnetic properties is opposite. When the cooling rate is slow, the linear expansion coefficient becomes larger, and the initial permeability and saturation magnetic induction strength of the alloy will increase, and the magnetic properties of the alloy will increase. Based on the microstructure and properties of the alloy under different heat treatment conditions, it is found that the stability and uniformity of the alloy microstructure avoid the volume change caused by the microstructure transformation and ensure the stability of the linear expansion coefficient. In addition, the motion state of Fe atoms and the magnetostriction in the process of spontaneous magnetization also ensure the stability of the linear expansion coefficient of the alloy. The main factors affecting the magnetic properties are the holding time and cooling rate. When the holding time is extended and the cooling rate is reduced, the magnetic properties are improved. Overall consideration, the heat treatment process of 4J36 alloy should choose solution + aging + stabilization + magnetic annealing. |
Key words: 4J36 alloy;heat treatment;magnetic energy;linear expansion coefficient |