Significant Influence of Welding Heat Input on the Microstructural Characteristics and Mechanical Properties of the Simulated CGHAZ in High Nitrogen V-Alloyed Steel
Significant Influence of Welding Heat Input on the Microstructural Characteristics and Mechanical Properties of the Simulated CGHAZ in High Nitrogen V-Alloyed Steel
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焊接热输入对高氮V合金钢模拟CGHAZ组织特征和力学性能的显着影响
DOI：
10.1515/htmp-2020-0003
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发表时间：
2020-01
影响因子：
1.5
通讯作者：
Meng Qingyong
中科院分区：
文献类型：
--
作者：
Zhang Jing;Xin Wenbin;Luo Guoping;Wang Ruifen;Meng Qingyong
研究了不同焊接热输入下高氮V合金钢模拟粗晶热影响区（CGHAZ）的显微组织特征和力学性能，以800℃至500℃的冷却时间（t8/5）为特征。实验结果表明，t8/5 30 s~90 s时显微组织主要为板条贝氏体（LB）和粒状贝氏体（GB）。随着t8/5的增加，LB含量降低，GB含量增加。当t8/5进一步增加到120 s和180 s时，显微组织主要由晶内多边形铁素体（IPF）和针状铁素体（IAF）组成。较高的t8/5导致晶内铁素体(IGF)含量增加。同时，随着 t8/5 从 30 s 增加到 180 s，原奥氏体晶粒尺寸 (PAGS) 从 56 ± 6.0 μm 逐渐增加到 148 ± 9.9 μm。此外，EBSD分析表明，大角度晶界（HAGB）的比例分别为0.570、0.427和0.624，对应于t8/5 30、90和180 s。此外，由于PAGS和GB含量的增加，冲击韧性随着t8/5从30 s增加到90 s而下降，然后由于IGF，尤其是IAF的形成增加，随着t8/5超过90 s而急剧增加。此外，高氮含量会加速V(C,N)析出，不仅抑制原奥氏体晶粒粗化，而且促进IGF的形成，导致HAGB数量增加，提高冲击韧性。
The microstructural characteristics and mechanical properties of the simulated coarse grained heat affected zone (CGHAZ) in high N V-alloyed steel have been conducted under different welding heat input, characterized by the cooling time taken from 800°C to 500°C (t8/5). The experimental results show that the microstructure is dominantly composed of lath bainite (LB) and granular bainite (GB) at t8/5 30 s– 90 s. The content of LB decreases with t8/5 increasing, and that of GB increases. When t8/5 further increases to 120 s and 180 s, the microstructure mainly consists of intragranular polygonal ferrite (IPF) and acicular ferrite (IAF). The higher t8/5 leads to the increased content of intragranular ferrite (IGF). Meanwhile, the prior austenite grain size (PAGS) progressively increases from 56 ± 6.0 μm to 148 ± 9.9 μm as t8/5 increases from 30 s to 180 s. Besides, EBSD analysis indicates that the fraction of high angle grain boundaries (HAGBs) is 0.570, 0.427 and 0.624, respectively, corresponding to t8/5 30, 90 and 180 s. Moreover, the impact toughness decreases as t8/5 increases from 30 s to 90 s caused by the increased PAGS and GB content, and then sharply increases with t8/5 exceeding 90 s due to the increased formation of IGF, especially IAF. Furthermore, the high nitrogen content accelerates V(C,N) precipitation, which not only inhibits the coarsening of prior austenite grains, but promotes the formation of IGF, resulting in the increased number of HAGBs and raising impact toughness.
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影响因子：
3
作者：
Zhi-xiong Zhu;Jian Han;Huijun Li;Cheng Lu
通讯作者：
Zhi-xiong Zhu;Jian Han;Huijun Li;Cheng Lu
影响因子：
1.8
作者：
Yongjie Zhang;Kunio Shinbo;T. Ohmura;Takuya Suzuki;K. Tsuzaki;G. Miyamoto;T. Furuhara
通讯作者：
Yongjie Zhang;Kunio Shinbo;T. Ohmura;Takuya Suzuki;K. Tsuzaki;G. Miyamoto;T. Furuhara
不同冷却工艺后钒氮合金钢的显微组织、析出相和力学性能
DOI：
10.1007/s11661-016-3763-5
发表时间：
2016-09
期刊：
Metallurgical and Materials Transaction A
影响因子：
--
作者：
张婧（zhang Jing;王福明Wang Fu-ming
通讯作者：
王福明Wang Fu-ming
影响因子：
8.4
作者：
Zhu, Zhixiong;Han, Jian;Li, Huijun
通讯作者：
Li, Huijun
影响因子：
8.4
作者：
Kumar, Sanjeev;Natha, S. K.;Kumar, Vinod
通讯作者：
Kumar, Vinod