Creep properties of V-4Cr-4Ti strengthened by cold working and aging
Creep properties of V-4Cr-4Ti strengthened by cold working and aging
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DOI：
10.1016/j.fusengdes.2011.01.081
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发表时间：
2011-10
影响因子：
1.7
通讯作者：
P. Zheng;T. Nagasaka;T. Muroga;J. Chen;Yanfen Li
中科院分区：
文献类型：
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作者：
P. Zheng;T. Nagasaka;T. Muroga;J. Chen;Yanfen Li
对V-4Cr-4 Ti合金（NIFS-HEAT-2）在700°C和750°C、真空度优于1×10− 6 Torr条件下的单轴蠕变性能进行了研究。该合金通过冷加工和时效进行热机械处理以强化。该处理引入高密度位错和精细沉淀物。沉淀物的钉扎被认为抑制了位错的滑移，导致在高应力水平下显著低的蠕变速率。最小蠕变速率与外加应力呈幂律关系，由于蠕变激活能与钒的扩散激活能相近，该合金的蠕变变形机制主要是位错攀移。
A study on uniaxial creep properties of V–4Cr–4Ti alloy (NIFS-HEAT-2) is carried out at 700°C and 750°C in a vacuum better than 1×10−6Torr. The alloy is thermomechanically treated by cold working and aging for strengthening. The treatment introduces high density dislocations and fine precipitates. The pinning by precipitates is considered to suppress the glide of dislocations, causing significantly low creep rate at high stress levels. Power-law dependence of the minimum creep rate on applied stress was found. The predominant mechanism of creep deformation for the alloy with the strengthening is most likely to be dislocation climbing, because the creep activation energy is near the diffusion activation energy of vanadium.