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首页> 外文期刊>Metallurgical and Materials Transactions, A. Physical Metallurgy and Materials Science >Comparative Tensile Flow and Work-Hardening Behavior of 9 Pct Chromium Ferritic-Martensitic Steels in the Framework of the Estrin-Mecking Internal-Variable Approach
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Comparative Tensile Flow and Work-Hardening Behavior of 9 Pct Chromium Ferritic-Martensitic Steels in the Framework of the Estrin-Mecking Internal-Variable Approach

机译：Estrin-Mecking内变法框架下9 Pct铬铁素体-马氏体钢的比较拉伸流和工作强化行为

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摘要

The comparative tensile flow and work-hardening behavior of P9 steel in two different product forms, normalized and tempered plate and thick section tube plate forging, and P91 steel were investigated in the framework of the dislocation dynamics based Estrin-Mecking (E-M) one-internal-variable approach. The analysis indicated that the flow behavior of P9 and P91 steels was adequately described by the E-M approach in a wide range of temperatures. It was suggested that dislocation dense martensite lath/cell boundaries and precipitates together act as effective barriers to dislocation motion in P9 and P91 steels. At room and intermediate temperatures, the evolution of the internal-state variable, i.e., the dislocation density with plastic strain, exhibited insignificant variations with respect to temperature. At high temperatures, a rapid evolution of dislocation density with plastic strain toward saturation with increasing temperature was observed. The softer P9 steel tube plate forging exhibited higher work hardening in terms of larger gains in the dislocation density and flow stress contribution from dislocations than the P9 steel plate and P91 steel at temperatures ranging from 300 K to 873 K (27 A degrees C to 600 A degrees C). The evaluation of activation energy suggests that the deformation is controlled by cross-slip of dislocations at room and intermediate temperatures, and climb of dislocations at high temperatures. The relative influence of initial microstructure on flow and work-hardening parameters associated with the E-M approach was discussed in the three temperature regimes displayed by P9 and P91 steels. (C) The Minerals, Metals & Materials Society and ASM International 2016
机译：在以位错动力学为基础的Estrin-Mecking（EM）的框架内，研究了P9钢在两种不同产品形式（正火和回火板厚壁管板锻件）与P91钢的比较拉伸流和加工硬化行为，内部变量方法。分析表明，通过E-M方法可以在很宽的温度范围内充分描述P9和P91钢的流动行为。有人提出，位错致密的马氏体板条/晶胞边界和析出物共同成为P9和P91钢中位错运动的有效屏障。在室温和中间温度下，内部状态变量的演变，即，具有塑性应变的位错密度，相对于温度显示出很小的变化。在高温下，观察到随着温度的升高，位错密度随着塑性应变快速趋向饱和。在300 K至873 K（27 A至600 A）的温度范围内，较软的P9钢管板锻件比P9钢板和P91钢具有更大的位错密度和位错流应力贡献，从而显示出更高的加工硬化性。摄氏度）。活化能的评估表明，变形受室温和中温下位错的交叉滑动以及高温下位错的爬升控制。在P9和P91钢显示的三个温度范围内，讨论了与E-M方法相关的初始组织对流动和加工硬化参数的相对影响。 （C）矿产，金属与材料学会和ASM International 2016

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