Mechanical properties and microstructures of high-chromium V-Cr-Ti type alloys
Mechanical properties and microstructures of high-chromium V-Cr-Ti type alloys
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DOI：
10.1016/j.jnucmat.2004.04.089
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发表时间：
2004-08
影响因子：
3.1
通讯作者：
K. Sakai;M. Satou;M. Fujiwara;K. Takanashi;A. Hasegawa;K. Abe
中科院分区：
文献类型：
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作者：
K. Sakai;M. Satou;M. Fujiwara;K. Takanashi;A. Hasegawa;K. Abe
V-Cr-Ti型合金的力学性能与热处理条件和铬含量有关。本文通过小型夏比冲击试验和显微组织观察，探讨了力学性能和热处理条件与铬含量之间的关系。所评价的钒合金为V-XCR-4Ti(x=4，7，10，12，15，20)。用透射电子显微镜观察了析出物的微观结构。V-XCR-4Ti合金中典型的析出物为Ti(C，O，N)和TiO2.在90 0~10 0 0℃和110 0~12 0 0℃之间的热处理样品中观察到了Ti(C，O，N)相，V-(4，7)Cr-4Ti合金的DBTt在−190°C左右，而其他合金的DBTt在−30°C以上.结果表明，在含铬10%以上的合金中，直径大于4 0 0 nm的析出物的形成以及铬的固溶硬化对合金DBTt的提高有影响
The mechanical properties of V–Cr–Ti type alloys depended on heat treatment conditions and Cr concentrations. In this paper the correlation between mechanical properties and heat treatment conditions as a function of Cr concentrations was explored using mini-size Charpy impact tests and microstructure observations. Vanadium alloys evaluated were V–xCr–4Ti (x=4, 7, 10, 12, 15, 20). Microstructure observations using transmission electron microscope (TEM) were performed to characterize the precipitates. The typical precipitates in the V–xCr–4Ti alloys were identified as Ti(C,O,N) and TiO2. Ti(C,O,N) was observed in specimens annealed between 900 and 1000 °C and TiO2was between 1100 and 1200 °C. The DBTT of V–(4,7)Cr–4Ti alloys was around −190 °C, while DBTT for the other alloys were above −30 °C. It is proposed that formation of precipitates larger than 400 nm in diameter found in the alloys containing more than 10% of Cr as well as solution hardening of Cr are affected to the increase of the DBTT of the alloys.