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首页> 外文期刊>Materials Science and Engineering >Grain character and mechanical properties of Fe-21Cr-15Ni-6Mn-Nb nonmagnetic stainless steel after solution treatment
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Grain character and mechanical properties of Fe-21Cr-15Ni-6Mn-Nb nonmagnetic stainless steel after solution treatment

机译：Fe-21Cr-15Ni-6Mn-Nb非磁性不锈钢固溶处理后的晶粒特征和力学性能

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摘要

A systematic investigation on grain growth behavior, grain boundary character distribution and mechanical properties of Fe-21Cr-15Ni-6Mn-Nb non-magnetic stainless steel was performed after solution treatment in temperature range of 1100-1200 degrees C with various durations. The results showed the hot-rolled plate still maintained fine microstructure with the grain size range of 11.5-19.6 mu m after solution treatment. A Nb(C, N) drag mechanism concurrent with a restraining effect of Sigma 3(n) boundaries during solution treatment resulted in a slow kinetics with grain growth exponent n of similar to 4. The proliferation mechanism of Sigma 3(n) boundaries mainly varied from Sigma 3 regeneration to new twinning accompanied by grain growth. Twin boundary has an effective strengthening role like a grain boundary. The YS, UTS and elongation of solution-treated plate was above 634.0 MPa, 838.9 MPa, 45.3%, respectively, which were superior to the conventional austenitic stainless steel. The Hall-Petch relationship was determined well between the grain size under the condition of either including or excluding twin boundaries and tensile results. An inherent relationship between k' and k (k' and k correspond to the circumstance of including and excluding twin boundaries, respectively), was expressed by k' = 1.52037 + 1.67168k.
机译：对Fe-21Cr-15Ni-6Mn-Nb非磁性不锈钢在1100-1200℃的温度范围内进行不同时间的固溶处理后，进行了晶粒长大行为，晶界特征分布和力学性能的系统研究。结果表明，固溶处理后的热轧板仍保持良好的显微组织，晶粒尺寸范围为11.5-19.6μm。 Nb（C，N）阻力机制与固溶处理期间Sigma 3（n）边界的抑制作用同时产生缓慢的动力学，其晶粒生长指数n接近4。Sigma 3（n）边界的增殖机理主要是从Sigma 3再生到伴随晶粒生长的新孪晶的变化。双晶边界具有有效的强化作用，如晶界。固溶板的YS，UTS和伸长率分别高于634.0 MPa，838.9 MPa和45.3％，优于常规的奥氏体不锈钢。在包括或排除孪晶边界和拉伸结果的条件下，在晶粒尺寸之间很好地确定了Hall-Petch关系。 k′和k之间的固有关系（k′和k分别对应于包括和排除孪生边界的情况）由k′＝ 1.5203​​7 + 1.67168k表示。

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