Aging kinetics of CF3 cast stainless steel in temperature range 300–400°C
Aging kinetics of CF3 cast stainless steel in temperature range 300–400°C
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CF3铸造不锈钢在300–400°C温度范围内的时效动力学
DOI：
10.1179/mst.1990.6.3.211
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发表时间：
1990
影响因子：
1.8
通讯作者：
K. Akhurst
中科院分区：
文献类型：
--
作者：
P. Pumphrey;K. Akhurst
现代压水反应堆核电站中使用的符合ASME SA 351 CF 3规范的铸件主要是奥氏体，但含有高达20%的铁素体，因此在约300°C的温度下使用时会失去韧性。为了显示足够的寿命终止韧性，正在对300°C以上加速老化的材料进行测试。需要关于脆化动力学的数据，并且还必须表明在两种温度下显著的冶金变化是相同的。使用在300 ° C、350 ° C和400°C下老化的夏比冲击试样研究了该动力学，并且该动力学与铁素体的硬化和该相中的显微组织变化有关。确定的脆化，铁素体的硬化，并为基础的调幅反应在铁素体的激活能是一致的，在这个系统中的化学扩散。MST/1187
Castings to the ASME SA351 CF3 specification used in modern pressurised water reactor nuclear power stations are mainly austenitic, but contain up to 20% ferrite, and as a result are subject to loss of toughness in service at about 300°C. To show adequate end of life toughness, tests are being carried out on material with accelerated aging above 300°C. Data on the kinetics of embrittlement are required, and it must also be shown that the significant metallurgical changes are the same at both temperatures. The kinetics has been investigated using Charpy impact specimens aged at 300, 350, and 400°C and it has been related to the hardening of the ferrite and to the microstructural changes in this phase. The activation energies determined for the embrittlement, for the hardening of the ferrite, and for the underlying spinodal reaction in the ferrite are consistent with that for chemical diffusion in this system. MST/1187