采用动态机械分析仪双悬臂法研究了含硼(B)和无硼两种Fe-Ni-Cr奥氏 体合金的内耗行为，并分析了氢致内耗峰以及B对氢致内耗的影响; 利用金相显微镜和扫描 电镜观察了这两种合金在不同热处理状态下的显微组织及相组成. 结果表明，经时效处理 后，无B合金的晶界上析出大量NiTi(η)相和少量碳化物，而含0.008%B的合金的晶界上只析 出少量的碳化物; 热充氢后，含B和无B合金分别在26和36 ℃附近出现一新内耗峰，这 是氢原子与含有析出相的晶界相互作用引起的. 添加B导致合金内耗峰温度和激活能降低， 说明B通过抑制晶界相的析出减弱了晶界对氢的捕获能力，从而减小氢致塑性损失.
Dynamic mechanical analyzer (DMA) was used to investigate the hydrogen embrittlement of two Fe-Ni-Cr austenitic alloys. The effects of hydrogen and grain-boundary phases on internal friction of the alloys were analyzed. Optical microscopy and scanning electron microscopy were used to observe the microstructures and grain-boundary phases. The results show that abundant Ni3Ti phases and little carbides precipitated at grain boundaries in the alloy without boron, while and only little Ni3Ti phase and carbides precipitated at grain boundaries in the alloy with boron. Thermal hydrogen charging caused two new internal friction peaks at about 27℃ and 36℃ in the alloys with and without boron respectively, and the peaks were resulted from the interaction between hydrogen atoms and the interfaces of grain-boundary phases. Boron decreased the temperature of hydrogen-induced internal friction peaks, indicating that the diminishing in grain-boundary phase by boron reduced the ability of grain boundary to trap hydrogen atoms. As a result, boron lowered the ductility loss of the alloy.
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| [1] | |
| [2] | |
| [3] | |
| [4] | |
| [5] | |
| [6] | |
| [7] | |
| [8] | |
| [9] | |
| [10] |
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