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首页> 外文期刊>Materials Science and Engineering >Nanostructure, microstructure and mechanical properties of duplex stainless steels 25Cr-7 Ni and 22Cr-5Ni (wt.%) aged at 325°C
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Nanostructure, microstructure and mechanical properties of duplex stainless steels 25Cr-7 Ni and 22Cr-5Ni (wt.%) aged at 325°C

机译：在325℃下老化双相不锈钢25cr-7 Ni和22cr-5ni（wt.％）的纳米结构，微观结构和力学性能

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摘要

The nanoscale concentration fluctuation evolution due to phase separation (PS) and the corresponding mechanical property changes in two duplex stainless steels, 22Cr-5Ni (2205) and 25Cr-7N1 (2507), have been studied after aging at 325 degrees C for up to 6000 h. The nanostructure characterization is performed using small-angle neutron scattering (SANS) and the microstructure and fractography analyses, including observations on fracture surfaces and fracture cross-sections, are performed by scanning electron microscopy and electron backscatter diffraction. The results show that the kinetics of PS in grade 2507 is faster than that in grade 2205, leading to greater hardening and deterioration in toughness for grade 2507 as compared to grade 2205. The evolution of the nanostructure in the ferrite phase changes the deformation mode from the original ductile fracture to a quasi-cleavage type fracture where deformation twins form in the hardened ferrite. Delamination, grain fragmentation in ferrite and plastic slip deformation of the austenite are suggested to dissipate most of the energy absorbed by the crack during brittle fracture.
机译：在325摄氏度下老化后，研究了由相分离（PS）和相应的机械性能变化，22Cr-5Ni（2205）和25cr-7n1（2507）进行了纳米级浓度波动进化。 6000小时。使用小角度中子散射（SAN）进行纳米结构表征，并且通过扫描电子显微镜和电子反向散射衍射进行微观结构和裂缝分析，包括对骨折表面和断裂横截面的观察。结果表明，与2205级相比，2507年级中PS的动力学比2205级更快，导致2507级的韧性更大的硬化和劣化。纳米结构在铁氧体相中的进化变化了变形模式原始延性骨折到拟裂型骨折，在硬化铁氧体中形成变形双胞胎。分层，建议奥氏体的铁素体和塑料滑动变形中的晶粒碎片，以消散在脆性断裂期间裂缝吸收的大部分能量。

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