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金属学报  2019, Vol. 55 Issue (4): 445-456    DOI: 10.11900/0412.1961.2018.00449
  本期目录 | 过刊浏览 |
23Cr-2.2Ni-6.3Mn-0.26NNi型双相不锈钢动态再结晶行为研究
邓亚辉,杨银辉(),曹建春,钱昊
昆明理工大学材料科学与工程学院 昆明 650093
Research on Dynamic Recrystallization Behavior of 23Cr-2.2Ni-6.3Mn-0.26N Low Nickel TypeDuplex Stainless Steel
Yahui DENG,Yinhui YANG(),Jianchun CAO,Hao QIAN
School of Materials Science and Engineering, Kunming University of Science and Technology, Kunming 650093, China
全文: PDF(13546 KB)   HTML
摘要: 

利用热模拟试验机在变形温度为1073~1423 K,应变速率为0.01~10 s-1的条件下对23Cr-2.2Ni-6.3Mn-0.26N节Ni型双相不锈钢动态再结晶行为进行研究。结果表明,试样在低温高应变速率变形时以两相动态回复(DRV)为主,而在高温低应变速率变形时以奥氏体动态再结晶(DRX)为主,且在0.01和0.1 s-1较低应变速率下,奥氏体相再结晶晶粒尺寸随变形温度升高而增大。试样的软化机制与Z参数有关,在低Z值条件下,热变形软化以奥氏体相DRX为主。基于热变形方程得到试样的表观应力指数为5.18,热变形表观激活能为391.16 kJ/mol,并利用Sellars 双曲正弦模型建立了峰值流变应力与Z参数关系本构方程。DRX临界应力随应变速率增加和变形温度减小而增大,DRX临界应变随变形温度减小而增加,且随应变速率增加(0.1~10 s-1)在较低变形温度下先增大后减小。确定了DRX临界应力(应变)和峰值应力(应变)的关系,DRX特征参数和Z参数相关模型,以及奥氏体相DRX体积分数模型。利用所建模型对DRX行为进行预测,表明应变速率增加和变形温度下降会推迟DRX发生。

关键词 双相不锈钢节Ni型动态再结晶临界应变临界应力    
Abstract

The difference of crystal structure and stacking fault energy (SFE) of two phases in duplex stainless steels (DSS) make different softening mechanism during hot deformation. Due to different austenite stability of Mn and Ni, the substitution of Mn for Ni will significantly affect dynamic recrystallization (DRX) behavior of compression deformation. The DRX behaviors of 23Cr-2.2Ni-6.3Mn-0.26N low nickel type DSS were studied in the deformation temperatures of 1073~1423 K and strain rates of 0.01~10 s-1 by using a thermal simulator. The results showed that the deformation procedure of samples are mainly softened by dynamic recovery (DRV) of two phases at low temperature and high deformation strain rate, and mainly softened by austenite DRX at high temperature and low deformation strain rate. At the low strain rates of 0.01 and 0.1 s-1, the grain size of austenite DRX increased with the increase of deformation temperature. The softening mechanism of samples are related to the Z parameter, and the deformation softening is mainly caused by austenite DRX under the condition of low Z value. Based on the thermal deformation equation, the apparent stress index of samples were calculated as 5.18, and the apparent activation energy of thermal deformation was calculated as 391.16 kJ/mol. The constitutive equation of the relationship between the peak flow stress and the Z parameter was established by hyperbolic sinusoidal model proposed by Sellars. The critical stress of DRX increases with increasing strain rate and decreasing deformation temperature, while the critical strain of DRX increases with the decrease of deformation temperature, and increases at first and then decreases with increasing strain rate (0.1~10 s-1) at low deformation temperature. The relationship between the DRX critical stress (strain) and peak stress (strain), as well as DRX characteristic parameters and Z parameter correlation models, and the austenite phase DRX volume fraction models were determined. Moreover, the DRX volume fraction models predict that the increase of strain rate and the decrease of deformation temperature can delay occurrence of DRX.

Key wordsduplex stainless steel    low nickel type    dynamic recrystallization    critical strain    critical stress
收稿日期: 2018-09-20     
ZTFLH:  TG142  
基金资助:国家自然科学基金项目(No.51461024)
通讯作者: 杨银辉     E-mail: yyhyanr@sina.com
Corresponding author: Yinhui YANG     E-mail: yyhyanr@sina.com
作者简介: 邓亚辉,男,1992年生,硕士生

引用本文:

邓亚辉,杨银辉,曹建春,钱昊. 23Cr-2.2Ni-6.3Mn-0.26NNi型双相不锈钢动态再结晶行为研究[J]. 金属学报, 2019, 55(4): 445-456.
Yahui DENG, Yinhui YANG, Jianchun CAO, Hao QIAN. Research on Dynamic Recrystallization Behavior of 23Cr-2.2Ni-6.3Mn-0.26N Low Nickel TypeDuplex Stainless Steel. Acta Metall Sin, 2019, 55(4): 445-456.

链接本文:

https://www.ams.org.cn/CN/10.11900/0412.1961.2018.00449      或      https://www.ams.org.cn/CN/Y2019/V55/I4/445

图1  相同应变速率、不同变形温度条件下的真应力-真应变曲线
图2  双相不锈钢在不同应变速率及温度下的典型OM像
图3  试样在不同温度下的应变硬化率曲线
ε˙ / s-1T / Kεcεpσc / MPaσp / MPaσs / MPa
0.110730.145260.26283248.750274.1315269.2720
11730.120750.20557182.550196.3656175.3600
13230.100910.1577784.07686.157175.0038
14230.083830.1237153.27654.715047.8533
110730.160510.33020312.590340.7937333.6438
11730.130120.20899297.210303.6478291.0098
13230.116010.20568123.460128.2068121.7003
14230.106820.1957889.24290.459681.5782
1010730.160030.30253377.082397.2519372.7911
11730.128700.24051334.830346.5571318.7496
13230.080130.11041204.780211.6203198.3243
14230.071020.09170116.350119.3346117.2951
表1  双相不锈钢的特征参数
图4  试样的临界应力-峰值应力和临界应变-峰值应变的关系
图5  峰值应力与应变速率和变形温度的关系
图6  参数lnZ和ln[sinh(ασp)]的拟合图
图7  峰值应力的实验值与计算值的比较
图8  临界条件与Z参数的拟合图
图9  在高、中、低Z值条件下应变硬化率随真应变增加的关系
图10  lnln(1/(1-X))和ln((ε-εc)/εp)的关系
图11  动态再结晶体积分数的实验值与计算值
图12  0.1和1 s-1应变速率的不同变形温度下的奥氏体相体积分数及模型预测奥氏体相动态再结晶体积分数随应变变化
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