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金属学报  2015, Vol. 51 Issue (2): 230-238    DOI: 10.11900/0412.1961.2014.00288
  本期目录 | 过刊浏览 |
Nb含量对NiCrFe-7焊缝金属组织、缺陷和力学性能的影响*
莫文林1,2, 张旭1, 陆善平1,2(), 李殿中1, 李依依1
1 中国科学院金属研究所沈阳材料科学国家(联合)实验室, 沈阳 110016
2 中国科学院核用材料与安全评价重点实验室, 沈阳 110016
EFFECT OF Nb CONTENT ON MICROSTRUCTURE, WELDING DEFECTS AND MECHANICAL PROPERTIES OF NiCrFe-7 WELD METAL
MO Wenlin1,2, ZHANG Xu1, LU Shanping1,2(), LI Dianzhong1, LI Yiyi1
1 Shenyang National Laboratory for Materials Science, Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016
2 Key Laboratory of Nuclear Materials and Safety Assessment, Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016
引用本文:

莫文林, 张旭, 陆善平, 李殿中, 李依依. Nb含量对NiCrFe-7焊缝金属组织、缺陷和力学性能的影响*[J]. 金属学报, 2015, 51(2): 230-238.
Wenlin MO, Xu ZHANG, Shanping LU, Dianzhong LI, Yiyi LI. EFFECT OF Nb CONTENT ON MICROSTRUCTURE, WELDING DEFECTS AND MECHANICAL PROPERTIES OF NiCrFe-7 WELD METAL[J]. Acta Metall Sin, 2015, 51(2): 230-238.

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摘要: 

采用相图计算、焊材设计、焊材制备、现场焊接和焊缝金属解剖的方法, 研究Nb含量对NiCrFe-7焊缝金属组织、缺陷和力学性能的影响. 结果表明, 随焊缝金属中Nb含量增加, 焊缝金属晶内MX (M=Nb, Ti, X=C, N)析出相增加, 晶界M23C6(M=Cr, Fe)的初始析出温度降低, 晶界M23C6析出相减少, 且M23C6由多列连续分布转变为单列离散分布; 焊缝金属中的高温失延裂纹(ductility-dip-cracking, DDC)的数量和尺寸减少; 焊缝金属的强度、塑性和弯曲性能显著提高。
关键词 ： NiCrFe-7焊缝金属,  失延裂纹,  Nb,  M23C6,  MX,  力学性能    
Abstract：

Ni-based filler metal is one of the most important filler metals in building the key components of nuclear power plants, however, ductility-dip-cracking (DDC) and inclusion defects form easily in the weldment and need to be repaired afterward. The precipitation of M23C6 (M=Cr, Fe) at grain boundaries will promote the nucleation and propagation of DDC. Adding Ti can form Ti(C, N) and reduce M23C6 precipitate at grain boundaries, which reduces DDC in the weld metal. However, the increase of Ti content in filler metal will cause the inclusion defects. Nb replacing part of Ti in Ni-based filler metal is proposed in this work. The reduction of Ti in filler metal is to reduce the sensitivity of inclusion defects in the weld metal. Nb can form MX (M=Nb, Ti, X=C, N) precipitates to reduce the M23C6 and DDC in weld metal. The effect of Nb on the size, number, and location of MX and M23C6 in Ni-based weldment has been investigated systematically in this work. Phase diagram calculations show that Nb is an element forming high temperature MX precipitate, and its affinity with oxygen is poor and not easy to form oxide. According to the phase diagram calculations, five different filler metals are designed and made with 0, 0.4%, 0.7%, 0.85%, 1.1%Nb content. The results show that the intragranular precipitates are distributed along sub grain boundaries. The intragranular precipitate for the Nb-free weld metal is Ti(C, N), whereas the intragranular precipitate in the Nb-bearing weld metals is MX. For the increased Nb in weld metals, more MX is produced, and more C is fixed within the grain. As the Nb content increased in weld metals, the initial precipitation temperature of M23C6 decreases, the intergranular M23C6 precipitate decreases and M23C6 turns discreted at grain boundaries. As Nb content increases in weld metals, the total crack length of DDC decreases. When the Nb content is over 0.85%, little DDC is found in the weld metals. The addition of Nb can improve the tensile strength, plasticity and bending property of the weld metals。
Key words： NiCrFe-7 weld metal    ductility-dip-cracking    Nb    M23C6    MX    mechanical property
收稿日期: 2014-05-29     
ZTFLH:  TG422.3  
基金资助:* 国家自然科学基金项目51474203和中国科学院重点部署项目KGZD-EW-XXX-2资助
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莫文林
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https://www.ams.org.cn/CN/10.11900/0412.1961.2014.00288      或      https://www.ams.org.cn/CN/Y2015/V51/I2/230

图1  NiCrFe-7合金二维垂直截面相图
图2  Nb含量对NiCrFe-7合金平衡析出相的影响
Sample Nb Al Ti C Si Fe Cr Ni
0Nb <0.02 0.1~0.2 0.2~0.4 0.02~0.04 0.1~0.3 9~11.5 29.5~30.5 Bal.
0.4Nb 0.30~0.50 0.1~0.2 0.2~0.4 0.02~0.04 0.1~0.3 9~11.5 29.5~30.5 Bal.
0.7Nb 0.60~0.80 0.1~0.2 0.2~0.4 0.02~0.04 0.1~0.3 9~11.5 29.5~30.5 Bal.
0.85Nb 0.80~0.95 0.1~0.2 0.2~0.4 0.02~0.04 0.1~0.3 9~11.5 29.5~30.5 Bal.
1.1Nb 1.00~1.20 0.1~0.2 0.2~0.4 0.02~0.04 0.1~0.3 9~11.5 29.5~30.5 Bal.
表1  焊丝合金成分的设计
图3  焊接接头示意图
图4  0Nb焊缝金属形貌
图5  0Nb和1.1Nb焊缝金属晶内析出相的SEM像和EDS分析
图6  不同Nb含量焊缝金属晶内析出相数量统计
图7  不同Nb含量焊缝金属晶界M23C6析出相的SEM像和TEM像
图8  0Nb焊缝金属中的高温失延裂纹(DDC)形貌
图9  不同Nb含量焊缝金属横截面的DDC总长度统计
图10  不同Nb含量焊缝金属的拉伸实验曲线
图11  不同Nb含量焊缝金属室温拉伸断口形貌
图12  不同Nb含量焊缝金属正弯的表面形貌
  
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