Mn对23%Cr节Ni型双相不锈钢高温拉伸行为的影响

doi:10.11900/0412.1961.2019.00376

金属学报

2020, Vol. 56

Issue (7): 949-959 DOI: 10.11900/0412.1961.2019.00376

本期目录 | 过刊浏览

Mn对23%Cr节Ni型双相不锈钢高温拉伸行为的影响

邓亚辉, 杨银辉(

), 蒲超博, 倪珂, 潘晓宇

昆明理工大学材料科学与工程学院昆明 650093

Effect of Mn Addition on High Temperature Tensile Behavior of 23%Cr Low Nickel Type Duplex Stainless Steel

DENG Yahui, YANG Yinhui(

), PU Chaobo, NI Ke, PAN Xiaoyu

School of Materials Science and Engineering, Kunming University of Science and Technology, Kunming 650093, China

引用本文:

邓亚辉, 杨银辉, 蒲超博, 倪珂, 潘晓宇. Mn对23%Cr节Ni型双相不锈钢高温拉伸行为的影响[J]. 金属学报, 2020, 56(7): 949-959.
Yahui DENG, Yinhui YANG, Chaobo PU, Ke NI, Xiaoyu PAN. Effect of Mn Addition on High Temperature Tensile Behavior of 23%Cr Low Nickel Type Duplex Stainless Steel[J]. Acta Metall Sin, 2020, 56(7): 949-959.

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摘要:

利用热模拟试验机在应变速率为0.01 s^-1和变形温度为300~1050 ℃的条件下，对23%Cr不同Mn含量(6.26%~14.13%，质量分数)节Ni型双相不锈钢进行高温拉伸研究。结果表明，高温拉伸变形时的主要承载相为奥氏体相，且Mn含量增加提高了奥氏体相的体积分数，有利于增强热塑性，但对抗拉强度影响较小。在550~1050 ℃变形时，随着Mn含量的增加断面收缩率增加，但在300 ℃变形时，断面收缩率有所下降。Mn含量的增加使得较低温度拉伸(450和750 ℃)的“易裂敏感点”略有增大，不同Mn含量条件下的最佳塑性温度区在500~650 ℃和850~1050 ℃。300 ℃变形时，Mn含量对加工硬化率影响小，1050 ℃变形时高Mn含量有利于在较低应变量下发生动态再结晶。不同Mn含量试样拉伸变形组织主要受奥氏体相位错结构演变影响，Mn含量较高(14.13%)时奥氏体相上形成的大量高密度、小尺寸位错胞可细化晶粒，有利于提高热塑性。

关键词 ：双相不锈钢, 节Ni型, Mn添加, 热塑性

Abstract：

There are different crystal structures and stacking fault energies (SFEs) for two phases of duplex stainless steel (DSS), and the Mn substitution for Ni also can change SFE of two phases and cause austenite stability variation during high temperature deformation. Thus, the thermal deformation behavior of DSS with Mn addition become more complex compared with that of single phase steel during high temperature tensile process. In this work, the high temperature tensile behavior of 23%Cr low nickel type DSS with different Mn contents (6.26%~14.13%, mass fraction) has been studied in the temperature of 300~1050 ℃ at strain rate of 0.01 s^-1 by using a thermal simulation machine. The results showed that the austenite phases mainly accommodate tensile deformation stress, and the volume fraction of them increased with increasing Mn contents, which is beneficial to enhance the thermoplasticity, and has little effect on the tensile strength. With more Mn addition, the reduction of area increases when deformed in the temperature of 550~1050 ℃, but decreases at lower temperature of 300 ℃. The value of crack sensitive point increased slightly when stretched at lower temperature (450 ℃, 750 ℃) with more Mn addition, and optimum plastic temperature zones are in the range of 500~650 ℃ and 850~1050 ℃. The effect of Mn addition on work hardening rate is slight when deformed at 300 ℃, while high Mn addition is favorable for dynamic recrystallization occurence at lower strain when deformed at higher temperature of 1050 ℃. The tensile deformation microstructure of different Mn addition samples are mainly dependent on the austenite dislocations evolution. As the Mn content attained 14.13%, a large number of dislocation cells with high density and small size formed in austenite phase, which is contributed to grains refinement and improves thermoplasticity.

Key words： duplex stainless steel low nickel type Mn addition thermoplasticity

收稿日期: 2019-11-08

ZTFLH:

TG142

基金资助:国家自然科学基金项目(51461024);国家自然科学基金项目(51861019)

作者简介: 邓亚辉，男，1992年生，硕士生

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https://www.ams.org.cn/CN/10.11900/0412.1961.2019.00376 或 https://www.ams.org.cn/CN/Y2020/V56/I7/949

表1 实验用双相不锈钢化学成分 (mass fraction / %)

图1 不同Mn含量双相不锈钢试样在应变速率0.01 s-1下不同温度高温拉伸时的真应力-真应变曲线

图2 不同Mn含量双相不锈钢试样垂直于拉伸方向的固溶态和550 ℃拉伸后近断口处截面显微组织的OM像

图3 不同Mn含量双相不锈钢试样在固溶态和550 ℃高温拉伸的奥氏体体积分数变化

图4 不同Mn含量双相不锈钢试样在不同温度条件下拉伸的加工硬化率-应变曲线

图5 不同Mn含量双相不锈钢试样在不同温度下拉伸时的抗拉强度和断面收缩率

图6 不同Mn含量双相不锈钢试样高温拉伸强度-断面收缩率特性曲线

图7 不同Mn含量双相不锈钢试样在300和550 ℃拉伸后的断口形貌的SEM像

图8 不同Mn含量双相不锈钢试样在550 ℃拉伸后断口夹杂物形貌的SEM像和EDS

图9 不同Mn含量双相不锈钢试样在550 ℃高温拉伸近断口处显微组织的TEM像

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