Micromechanical testing of unirradiated and helium ion irradiated SA508 reactor pressure vessel steels: Nanoindentation vs in-situ microtensile testing
Micromechanical testing of unirradiated and helium ion irradiated SA508 reactor pressure vessel steels: Nanoindentation vs in-situ microtensile testing
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DOI：
10.1016/j.msea.2020.139942
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发表时间：
2020-10-07
期刊：
影响因子：
6.4
通讯作者：
Wenman, M. R.
中科院分区：
文献类型：
--
作者：
Gasparrini, C.;Xu, A.;Wenman, M. R.
本文证明微拉伸试验是测量离子辐照热等静压SA 508铁素体/贝氏体钢的辐照硬化和塑性降低的可行技术。用He 2+离子辐照作为中子辐照的替代物，以达到0.6 dpa的损伤水平（Kinchin-Pease）。测量了四个未辐照微拉伸钢试样的机械性能，并与整体性能进行了比较：当平均0.2%屈服应力为501.6 +/- 56.0 MPa时，与宏观拉伸0.2%屈服应力456.2 +/- 1.7 MPa非常一致。在未辐照的材料中的micmtensive和标准拉伸0.2%屈服应力之间的协议的基础上，它是可以直接测量从离子辐照与He 2+离子进行的剂量为0.6 dpa的辐射诱导硬化。离子辐照钢的微拉伸试验表明，约730 MPa的0.2%的屈服应力增加。通过纳米压痕测量的辐射硬化为3.22 +/-0.29GPa。辐照硬化高于以前在低温下暴露于类似剂量的中子辐照低合金钢中观察到的硬化，
In this paper, microtensile testing is demonstrated to be a viable technique for measuring irradiation hardening and reduction of ductility of ion irradiated hot isostatic pressed SA508 ferritic/bainitic steel. Ion irradiation with He2+ was used as a surrogate for neutron irradiation to reach a damage level of 0.6 dpa (Kinchin-Pease). The mechanical properties of four unirradiated microtensile steel specimens were measured and compared to the bulk properties: when averaged the 0.2% proof stress was 501.6 +/- 56.0 MPa, in good agreement with the macrotensile 0.2% proof stress of 456.2 +/- 1.7 MPa. On the basis of the agreement between micmtensile and standard tensile 0.2% proof stress in the unirradiated material, it was possible to directly measure irradiation induced hardening from ion irradiation performed with He2+ ions to a dose of 0.6 dpa. Micmtensile testing of the ion irradiated steel revealed an increase in 0.2% proof stress of approximately 730 MPa. The irradiation hardening measured by nanoindentation was 3.22 +/- 0.29 GPa. Irradiation hardening was higher than that previously observed in neutron irradiated low alloy steels exposed to similar doses at low temperatures (