| 引用本文: | 曹宇,邸洪双,张敬奇,马天军.800H合金静态软化行为及其亚结构演变[J].材料科学与工艺,2013,21(3):95-104.DOI:10.11951/j.issn.1005-0299.20130315. |
| CAO Yu,DI Hong-shuang,ZHANG Jing-qi,MA Tian-jun.Static softening behavior of Incoloy 800H and its evolution of substructure[J].Materials Science and Technology,2013,21(3):95-104.DOI:10.11951/j.issn.1005-0299.20130315. |
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| 摘要: |
| 为优化铁镍铬耐蚀合金Incoloy 800H的热加工生产工艺,在MMS-300热力模拟试验机上对其进行双道次热压缩实验,绘制出不同变形条件下的双道次流变应力曲线,研究了变形温度、变形程度、应变速率与初始奥氏体晶粒尺寸等参数对其静态软化行为的影响.利用EBSD及TEM技术分析了道次间隔时间内亚结构变化规律,建立了合金静态再结晶动力学模型.结果表明：变形温度对静态再结晶速率的影响最为明显；当变形温度低于950 ℃时,沿晶界析出Cr23C6对大角度晶界产生钉扎作用,抑制了静态再结晶的发生,静态软化机制以回复作用为主；当变形温度高于950 ℃时,析出物逐渐溶解,钉扎作用随之减弱,发生了静态再结晶；建立的静态再结晶动力学模型在预测静态再结晶体积分数方面具有较高精度. |
| 关键词: Incoloy 800H 流变应力 静态再结晶 亚结构 应变诱导析出 再结晶动力学模型 |
| DOI：10.11951/j.issn.1005-0299.20130315 |
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| 基金项目:国家重点基础研究发展计划资助项目(2011CB606306-2)；东北大学基本科研业务费资助项目(N110607005). |
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| Static softening behavior of Incoloy 800H and its evolution of substructure |
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CAO Yu1,DI Hong-shuang1,ZHANG Jing-qi1,MA Tian-jun2
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(1. State Key Laboratory of Rolling and Automation, Northeastern University, Shenyang 110819,China; 2. Baoshan Iron&Steel Co., Ltd., Special Steel Business Unit, Shanghai 200940,China)
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| Abstract: |
| For the purpose of optimizing hot working processes for Incoloy 800H,two-pass hot compression tests have been performed on MMS-300 thermo-simulation machine.The flow stress curves of two-pass compression under different deformation conditions have been plotted,and the effects of deformation temperature, strain,strain rate and initial austenite grain size on the static softening behavior have been investigated. The characteristics of substructure development in the inter-pass time have been analyzed by EBSD and TEM technique, and the recrystallization kinetic model has been established based on experimental results. The results showed that the influence of deformation temperature on the rate of static recrystallization was the most obvious.When deformation temperature was below 950 ℃, the static recrystallization was inhibited by precipitated phase of Cr23C6 at grain boundaries, which pinned the high angle grain boundary. The dominant softening mechanism was static recovery. With the increase of deformation temperature,the precipitation dissolved gradually,which decreased the pinning effect and resulted in the occurrence of static recrystallization.The static recrystallization kinetic model had a high accuracy in the prediction of recrystallization volume fraction. |
| Key words: Incoloy 800H flow stress static recrystallization substructure strain induced precipitation recrystallization kinetic model |
