-1下的壓縮變形行為，分析了變形溫度和應(yīng)變速率對(duì)熱流曲線的影響?；谖诲e(cuò)密度理論，建立了316LN鋼的熱變形本構(gòu)模型，并揭示了316LN鋼的軟化機(jī)理。結(jié)果表明，在高溫低應(yīng)變速率（小于0.1 s-1）條件下，動(dòng)態(tài)再結(jié)晶（DRX）為主導(dǎo)軟化機(jī)理；在高溫高應(yīng)變速率（大于1 s-1）條件下，動(dòng)態(tài)回復(fù)（DRV）為主導(dǎo)軟化機(jī)理；在高溫及應(yīng)變速率為0.1和1 s-1條件下，DRV和DRX共同作用。構(gòu)建的模型可以很好地預(yù)測(cè)316LN鋼的熱變形行為，其Pearson相關(guān)系數(shù)為0.9956，平均相對(duì)誤差絕對(duì)值為3.07%，為一個(gè)精確的本構(gòu)模型。"/>

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基于位錯(cuò)密度理論的核級(jí)316LN不銹鋼高溫本構(gòu)模型
作者:
作者單位:

1.太原鋼鐵(集團(tuán))有限公司 先進(jìn)不銹鋼材料國(guó)家重點(diǎn)實(shí)驗(yàn)室，山西 太原 030003;2.中北大學(xué) 材料科學(xué)與工程學(xué)院，山西 太原 030051;3.中山大學(xué) 化學(xué)工程與技術(shù)學(xué)院，廣東 珠海 519082

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基金項(xiàng)目:

the Youth Top Talents Support Project of Shanxi Province (No.201606) and the Natural Science Foundation of Shanxi Province(No. 201801D121081), and the Natural Science Foundation of China (Nos.51474152, 51401143, 51274149).


Constitutive Model Based on Dislocation Density Theory for Nuclear-Grade 316LN Stainless Steel at Elevated Temperatures
Author:
Affiliation:

1.State Key Laboratory of Advanced Stainless Steel, Taiyuan Iron & Steel (Group) Co., Ltd, Taiyuan 030003, China;2.School of Materials Science and Engineering, North University of China, Taiyuan 030051, China;3.School of Chemical Engineering and Technology, Sun Yat-sen University, Zhuhai 519082, China

Fund Project:

Youth Top Talents Support Project of Shanxi Province (201606); Natural Science Foundation of Shanxi Province (201801D121081); National Natural Science Foundation of China (51474152, 51401143, 51274149)

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    摘要:

    研究了316LN奧氏體不銹鋼在1050~1200 ℃、應(yīng)變速率0.1，1和50 s-1下的壓縮變形行為，分析了變形溫度和應(yīng)變速率對(duì)熱流曲線的影響?；谖诲e(cuò)密度理論，建立了316LN鋼的熱變形本構(gòu)模型，并揭示了316LN鋼的軟化機(jī)理。結(jié)果表明，在高溫低應(yīng)變速率（小于0.1 s-1）條件下，動(dòng)態(tài)再結(jié)晶（DRX）為主導(dǎo)軟化機(jī)理；在高溫高應(yīng)變速率（大于1 s-1）條件下，動(dòng)態(tài)回復(fù)（DRV）為主導(dǎo)軟化機(jī)理；在高溫及應(yīng)變速率為0.1和1 s-1條件下，DRV和DRX共同作用。構(gòu)建的模型可以很好地預(yù)測(cè)316LN鋼的熱變形行為，其Pearson相關(guān)系數(shù)為0.9956，平均相對(duì)誤差絕對(duì)值為3.07%，為一個(gè)精確的本構(gòu)模型。

    Abstract:

    The compression deformation behavior of 316LN austenitic stainless steel was investigated at 1050~1200 °C under strain rate of 0.1, 1, 50 s-1. The influence of deformation temperature and strain rate on the hot flow curves was analyzed. Based on the dislocation density theory, the hot deformation constitutive model of 316LN steel was established. The softening mechanism of the 316LN steel was revealed. The results show that the dynamic recrystallization (DRX) dominates the softening mechanism under the condition of high temperature and low strain rate (<0.1 s-1); the dynamic recovery (DRV) dominates the softening mechanism under the condition of high temperature and high strain rate (>1 s-1); DRX and DRV dominate the softening mechanism under the condition of high temperature and strain rate of 0.1, 1 s-1. The established constitutive model can precisely predict the hot deformation behavior of 316LN steel: its Pearson correlation coefficient is 0.9956 and the average absolute value of relative error is 3.07%, indicating the accuracy of this constitutive model.

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趙振鐸,李莎,徐梅,裴海祥,范光偉,趙子龍.基于位錯(cuò)密度理論的核級(jí)316LN不銹鋼高溫本構(gòu)模型[J].稀有金屬材料與工程,2022,51(3):888~894.[Zhao Zhenduo, Li Sha, Xu Mei, Pei Haixiang, Fan Guangwei, Zhao Zilong. Constitutive Model Based on Dislocation Density Theory for Nuclear-Grade 316LN Stainless Steel at Elevated Temperatures[J]. Rare Metal Materials and Engineering,2022,51(3):888~894.]
DOI：10.12442/j. issn.1002-185X.20210031

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  • 收稿日期:2021-01-12
  • 最后修改日期:2021-03-17
  • 錄用日期:2021-04-15
  • 在線發(fā)布日期: 2022-03-30
  • 出版日期: 2022-03-30