王旭,贺定勇,邵蔚,周正,吴旭,张铁军.硼含量对NiCrB堆焊合金高温氧化性能的影响[J].表面技术,2023,52(8):247-254, 300.
WANG Xu,HE Ding-yong,SHAO Wei,ZHOU Zheng,WU Xu,ZHANG Tie-jun.Effect of Boron Content on High-temperature Oxidation Resistance of NiCrB Surfacing Alloy[J].Surface Technology,2023,52(8):247-254, 300 |
| 硼含量对NiCrB堆焊合金高温氧化性能的影响 |
| Effect of Boron Content on High-temperature Oxidation Resistance of NiCrB Surfacing Alloy |
| 投稿时间：2022-08-16 修订日期：2022-09-20 |
| DOI：10.16490/j.cnki.issn.1001-3660.2023.08.019 |
| 中文关键词: NiCrB合金 粉芯丝材 堆焊 高温氧化 CrBO3 硬度 |
| 英文关键词:NiCrB alloy cored wire surfacing high-temperature oxidation CrBO3 hardness |
| 基金项目: |
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| Author | Institution |
| WANG Xu | Faculty of Materials and Manufacturing, Beijing University of Technology, Beijing 100124, China |
| HE Ding-yong | Faculty of Materials and Manufacturing, Beijing University of Technology, Beijing 100124, China;Beijing Engineering Research Center of Eco-Materials and LCA, Beijing 100124, China |
| SHAO Wei | Faculty of Materials and Manufacturing, Beijing University of Technology, Beijing 100124, China |
| ZHOU Zheng | Faculty of Materials and Manufacturing, Beijing University of Technology, Beijing 100124, China |
| WU Xu | Faculty of Materials and Manufacturing, Beijing University of Technology, Beijing 100124, China |
| ZHANG Tie-jun | Pipe Technology Service Center, Sinopec Shengli Petroleum Engineering Co., Ltd., Shandong Dongying 257000, China |
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| 中文摘要: |
| 目的 探究硼含量对NiCrB堆焊合金高温氧化性能的影响。方法 以粉芯丝材为原材料，利用氩弧焊工艺制备5种不同硼含量的NiCrB(B的质量分数为0~3.5%)堆焊合金，在800 ℃的温度下进行氧化试验，总氧化时间为200 h。通过XRD和SEM检测样品的物相组成和微观形貌，并用EDS分析化学成分。堆焊合金氧化前后的硬度通过维氏硬度计测量。结果 随着硼含量的提高，堆焊合金中硼化物的含量逐渐增加，因此堆焊合金的硬度也逐渐升高。氧化后，硼含量为0的NiCr堆焊合金表面生成致密的Cr2O3氧化膜，抗氧化性能为最佳。硼的质量分数≥0.8%的堆焊合金表面形成含有Cr2O3和CrBO3的氧化膜，其抗氧化性能因CrBO3含量的升高而降低。硼的质量分数为0.8%时，NiCrB堆焊合金的抗氧化能力接近NiCr合金，当硼的质量分数≥1.6%后，氧化膜逐渐变为疏松，硼含量越高，氧化膜剥落面积越大。硼的质量分数为3.5%时，堆焊合金与氧化膜界面处的CrB和Cr5B3优于铬发生氧化，成为氧向内部扩散的通道。氧化后合金的硬度变化很小。结论 硼的质量分数为0.8%的NiCrB堆焊合金的硬度有明显提高，并有较好的抗氧化性，硼的质量分数≥1.6%后，CrBO3的大量产生降低了氧化膜的保护性。 |
| 英文摘要: |
| Ni-based surfacing alloys have the reliable oxidation resistance in protecting the steel tubes of coal-fired boilers operating in power plant. However, these conventional surfacing alloys are not hard enough to bear the wear from the sand particles in circulating fluidized bed boiler. Therefore, the protective surfacing alloys should possess both good oxidation resistance and high hardness. Researchers have shown that chromium (Cr) can enhance the oxidation resistance of Ni-based surfacing alloys while boron (B) can improve the hardness of the surfacing alloys. Thus, NiCrB surfacing alloys with different boron contents were designed in this work for tube protection. The oxidation resistance and hardness of the surfacing alloys were investigated. Five NiCrB (Cr:24.0%, B:0~3.5% in mass) cored wires with different boron contents were produced, and then these cored wires were used to manufacture surfacing alloys by TIG process. The high-temperature oxidation behavior of the surfacing alloys was investigated after 200 hours of oxidation at 800 ℃. An electronic scale with an accuracy of 0.01 mg was used to measure the mass of the samples during the high-temperature oxidation tests. The high-temperature oxidation kinetic curves were plotted based on the per unit area mass gain of the samples and the oxidation time. The hardness, phase compositions and microstructures of the surfacing alloys were analyzed by Vickers hardness tester, XRD and SEM-EDS, respectively. Compared to NiCr surfacing alloy, the hardness of NiCrB surfacing alloys was significantly increased. The rise in boron content increased the boride content in the alloy, and thus the hardness was improved. In addition, the hardness of the alloys before and after oxidation changed slightly. The NiCrB surfacing alloys possessed NiCr solid solution and borides, which were was mainly CrB and Cr5B3. After oxidation tests, NiCr surfacing alloys showed the best oxidation resistance due to the formation of dense Cr2O3 oxide scale. The oxidation products of NiCrB surfacing alloys were composed of Cr2O3 and CrBO3. CrBO3 was the reaction product of B2O3 and Cr2O3. The results showed that the oxidation resistance of NiCrB surfacing alloys was affected by the content of the CrBO3. When the boron content was 0.8 wt.%, the oxide scale formed was thin and adhered well to the NiCrB surfacing alloy. Therefore, the alloys had a similar oxidation resistance to the NiCr surfacing alloy. When the boron content was ≥1.6 wt.%, the oxide scale gradually became loose and presented a multi-layer structure. With the further increase in boron content, the oxide scale tended to peel off in the tests. CrBO3 was formed in large quantities in the oxide scale, which led to the loosening of the scale. B2O3 was in liquid state at 800 ℃ when B2O3 reacted with Cr2O3 to form CrBO3, resulting in a change in the volume of the oxide scale. As a result, the cracks and pores generated within the oxide scale, which contributed to the formation of a multi-layer structure of oxide scale. Moreover, the discontinuous formation of Cr2O3 and CrBO3 also facilitated the loosening of the scale. Additionally, selective oxidation of CrB and Cr5B3 was happened prior to chromium, resulting in the internal oxidation of NiCrB surfacing alloy with the boron content of 3.5 wt.%. |
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