Ti和Nb对铁基堆焊合金组织性能的影响

贾华; 高明; 刘政军

doi:10.12073/j.hjxb.20220412001

Ti和Nb对铁基堆焊合金组织性能的影响

贾华^1,,
高明¹,
刘政军^2, ,

1.
大连海洋大学, 大连, 116023
2.
沈阳工业大学, 沈阳, 110870

基金项目: 辽宁省博士科研启动基金项目(2021-BS-237)；辽宁省教育厅高等学校基本科研项目(LJKMZ20221108)

详细信息

作者简介:
贾华，博士；主要从事表面强化技术方面的科研和教学工作；发表论文10余篇. Email: jiahua110023@126.com

通讯作者:
刘政军，博士，教授，博士研究生导师；Email: liuzhengjun1962@163.com.

中图分类号: TG 455
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出版历程
- 收稿日期: 2022-04-11
- 网络出版日期: 2023-02-14
- 刊出日期: 2023-03-24

Effect of Ti and Nb on microstructure and properties of Fe based surfacing alloy

1.
Dalian Ocean University, Dalian 116023, China
2.
Shenyang University of Technology, Shenyang 110870, China

摘要

摘要: 改变Ti或Nb的添加量制备Fe-Cr-C-B系铁基堆焊合金. 借助扫描电镜、X射线衍射仪、洛氏硬度计和磨损试验机对堆焊合金组织性能进行测试分析. 结果表明，在含Ti或Nb的堆焊合金中，初生奥氏体晶粒细化，共晶组织呈断网状均匀分布，并分别有黑色圆形或块状TiC和菱形或三角形NbC硬质相颗粒生成，添加5%Ti的堆焊合金组织最细小. TiC或NbC硬质相颗粒在组织中呈均匀弥散分布，能够作为耐磨质点与细化的初生奥氏体和共晶组织构成耐磨骨架，共同抵抗磨粒的楔入与切削作用. 当Ti添加量为5%时，含Ti堆焊合金达到最优耐磨性，硬度为66 HRC，磨损量为0.0487 g；当Nb添加量为4%时，含Nb堆焊合金达到最优耐磨性，硬度为65 HRC，磨损量为0.0524 g. 在同等条件下，含有适量Ti的铁基堆焊合金具有更优的耐磨性.
- 铁基堆焊合金 /
- 自保护药芯焊丝 /
- 明弧堆焊 /
- 组织性能 /
- TiC和NbC颗粒
Abstract: Fe-Cr-C-B Fe based surfacing alloy was prepared by changing the addition of Ti or Nb. The microstructure and properties of surfacing alloy were tested and analyzed by means of scanning electron microscope, X-ray diffraction, Rockwell hardness tester and wear tester. The results show that in the surfacing alloy containing Ti or Nb, the primary austenite grain is refined, the eutectic structure is evenly distributed in a broken network, and black circular or massive TiC and rhombic or triangular NbC hard phase particles are formed respectively. The microstructure of the surfacing alloy with 5% Ti is the smallest. Tic or NbC hard phase particles are evenly dispersed in the structure and can be used as wear-resistant particles to form a wear-resistant skeleton with refined primary austenite and eutectic structure to jointly resist the wedging and cutting effect of wear particles. When the content of Ti is 5%, the surfacing alloy containing Ti achieves the best wear resistance, the hardness is 66 HRC and the wear amount is 0.048 7 g; When the addition of Nb is 4%, the surfacing alloy containing Nb achieves the best wear resistance, the hardness is 65 HRC and the wear amount is 0.052 4 g. Under the same conditions, the iron-based surfacing alloy containing an appropriate amount of Ti has better wear resistance.
- iron base surfacing alloy /
- self-protective flux cored wire /
- open arc surfacing /
- microstructure and properties /
- TiC and NbC particles

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图 1 堆焊层的X射线衍射图谱

Figure 1. X-ray diffraction pattern of surfacing layer

下载: 全尺寸图片幻灯片

图 2 各反应物吉布斯自由能的变化曲线

Figure 2. Variation curve of Gibbs free energy of each reactant

下载: 全尺寸图片幻灯片

图 3 不同Ti或Nb添加量时堆焊层的硬度和磨损量

Figure 3. Hardness and wear of surfacing layer with different addition of Ti or Nb. (a) hardness; (b) wear amount

下载: 全尺寸图片幻灯片

图 4 不同试样的显微组织形貌

Figure 4. Microstructure and morphology of different samples. (a) without Ti or Nb; (b) 5%Ti; (c) 4%Nb

下载: 全尺寸图片幻灯片

图 5 不同试样的磨损形貌

Figure 5. Wear morphology of different samples. (a) without Ti or Nb; (b) 5%Ti; (c) 4%Nb

下载: 全尺寸图片幻灯片

表 1 各反应物的吉布斯自由能

Table 1 Gibbs free energy of each reactant

反应方程式	吉布斯自由能ΔG₀/(J·mol⁻¹)	温度范围△T/K
23Cr + 6C=Cr₂₃C₆	−309600 − 77.4 T	298＜ T ＜1793
7Cr + 3C=Cr₇C₃	−153600 − 37.2 T	298＜ T ＜2130
3Fe + C=Fe₃C	29040 − 28.03 T11234 − 11.0 T	298＜ T ＜1000 1000＜ T ＜1410
Ti + C=TiC	−184800 + 12.55 T	298＜ T ＜1943
Nb + C=NbC	−317748 + 38.851 T	298＜ T ＜3973

下载: 导出CSV

表 2 堆焊层化学成分(质量分数，%)

Table 2 Chemical compositions of surfacing layer

试样	Cr	C	B	Ti	Nb	Fe
未加Ti或Nb	12.96	1.48	0.52	—	—	余量
5%Ti	12.89	1.55	0.53	1.43	—	余量
4%Nb	12.82	1.57	0.52	—	1.31	余量

下载: 导出CSV

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