effect of nitrogen content on hot deformation behavior and grain growth in nuclear grade 316ln stainless steel

氮含量对核级316LN不锈钢热变形行为及晶粒长大的影响

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ID: 228310
2015
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Abstract
316LN stainless steel with 0.08%N (08N) and 0.17%N (17N) was compressed at 1073–1473 K and 0.001–10 s−1. The hot deformation behavior was investigated using stress-strain curve analysis, processing maps, and so forth. The microstructure was analyzed through electron backscatter diffraction analysis. Under most conditions, the deformation resistance of 17N was higher than that of 08N. This difference became more pronounced at lower temperatures. The strain rate sensitivity increased with increasing temperature for types of steel. In addition, the higher the N content, the higher the strain rate sensitivity. Hot deformation activation energy increased from 487 kJ/mol to 549 kJ/mol as N concentration was increased from 0.08% to 0.17%. The critical strain for initiation of dynamic recrystallization was lowered with increasing N content. In the processing maps, both power dissipation ratio and unstable region increased with increasing N concentration. In terms of microstructure evolution, N promoted dynamic recrystallization kinetic and decreased dynamic recrystallization grain size. The grain growth rate was lower in 17N than in 08N during heat treatment. Finally, it was found that N favored twin boundary formation.
对含 0.08%N (08N) 和 0.17%N (17N) 的 316LN 不锈钢在 1073–1473 K 和 0.001–10 s⁻¹ 条件下进行了压缩实验。通过应力-应变曲线分析、加工图等手段研究了其热变形行为。利用电子背散射衍射分析了其显微组织。在大多数条件下，17N 的变形抗力高于 08N，且这种差异在较低温度下更为显著。两种钢的应变速率敏感性均随温度升高而增加；此外，氮含量越高，应变速率敏感性越高。随着氮含量从 0.08% 增加到 0.17%，热变形激活能从 487 kJ/mol 提高至 549 kJ/mol。动态再结晶开启的临界应变随氮含量的增加而降低。在加工图中，功率耗散率和失稳区均随氮含量的增加而增大。在显微组织演变方面，氮促进了动态再结晶动力学并减小了动态再结晶晶粒尺寸。在热处理过程中，17N 的晶粒长大速率低于 08N。最后研究发现，氮有利于孪晶界的形成。
Reference Key
guo2015advanceseffect Use this key to autocite in the manuscript while using SciMatic Manuscript Manager or Thesis Manager
Authors ;Ming-wei Guo;Zhen-hua Wang;Ze-an Zhou;Shu-hua Sun;Wan-tang Fu
Journal bulletin of the korean chemical society
Year 2015
DOI
10.1155/2015/427945
URL
http://dx.doi.org/10.1155/2015/427945
Keywords
materials of engineering and construction mechanics of materials

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