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利用铍环焊接样品进行了铍材在稳态堆上中子衍射应力测试的参数及其优化研究。结果表明:在中子束波长0.1587 nm和中子注量率2×10~6 n·cm~(-2)·s~(-1)的条件下,铍材中子衍射应力测试可以选取Be(110)晶面,衍射角为88.2°,规范体积为2 mm×2 mm×2 mm,初次测试采用时间为120 s,对单点进行4次重复性测试,表明衍射强度计数存在明显波动,测试应变的最大偏差接近300με,延长时间至6000 s后测试,表明衍射曲线较为平滑,重复性好,测试应变的最大偏差减小至50με以内,相应铍材的应力测试精度约15 MPa;利用优化参数对焊接铍环焊缝附近的环向应变进行了测试,表明分布规律与国外文献报道趋势基本一致,进一步开展铍材的中子衍射应力测试奠定了基础。
Using the beryllium ring welding samples, the parameters of the beryllium material in the steady state heap neutron diffraction stress test and its optimization were studied. The results show that under the conditions of a neutron beam wavelength of 0.1587 nm and a neutron fluence rate of 2 × 10 ~ 6 n · cm ~ (-2) s ~ (-1) (110) crystal plane, the diffraction angle is 88.2 °, the standard volume is 2 mm × 2 mm × 2 mm, the initial test time is 120 s, and the repeatability test is performed on single point for four times, which shows that the diffraction intensity count fluctuates obviously, The maximum deviation of the test strain is close to 300με. After the test is extended to 6000s, the diffraction curve is smoother and the repeatability is good. The maximum deviation of the test strain is reduced to less than 50με, and the stress measurement accuracy of the corresponding beryllium material is about 15 MPa. The parameters are used to test the hoop strain near the welding beryllium ring weld, which shows that the distribution rule is basically the same as that reported in foreign literature, which lays the foundation for further testing the neutron diffraction stress of beryllium material.