Reaction behavior, microstructure, and mechanical properties of FeAl-316 stainless steel joints
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摘要: 采用热爆反应与粉末冶金相结合的工艺实现了FeAl金属间化合物与316不锈钢（316SS）的有效连接，研究了连接温度（700、800、900 ℃）对界面成分组成和力学性能的影响。结果表明，当加热到637 ℃时，FeAl反应层温度瞬间升高到1050 ℃，发生明显的热爆反应，并伴随持续约15 s的剧烈放热。随着温度从700 ℃提高到900 ℃，界面由Fe-316SS、316SS(Al)交替组成的形式转变为由FeAl-316SS(Al)-316SS组成。三种温度下均形成良好的冶金结合，当连接温度为800 ℃时，抗剪切强度可达75 MPa。Abstract: The effective joining between the FeAl intermetallic compounds and the 316 stainless steels was realized by the combination of thermal explosion reaction and powder metallurgy. The effect of joining temperature (700, 800, 900 ℃) on the interface composition and mechanical properties were studied. The results show that, the temperature of FeAl reaction layer rises to 1050 ℃ instantaneously when it is heated to 637 ℃, and the obvious thermal explosion reaction occurs, accompanied by the intense heat release lasting about 15 s. With the increase of joining temperature from 700 ℃ to 900 ℃, the interface is composed of Fe-316SS and 316SS(Al) alternately, which is transformed into FeAl-316SS(Al)-316SS. Sound metallurgical bonding is formed at all these three temperatures. When the joining temperature is 800 ℃, the shear strength reaches 75 MPa.
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图 1 Fe−Al反应层随炉升温的实际温度及炉膛温度
Figure 1. Actual temperature and the furnace temperature of the Fe−Al reactive layer during heating process
图 3 不同实验温度下形成的Fe−Al反应层X射线衍射图谱
Figure 3. XRD patterns of the Fe−Al reactive layer at different temperatures
图 4 Fe−Al/316SS接头截面扫描电镜背散射模式形貌和能谱分析：（a）和（d）700 ℃；（b）和（e）800 ℃；（c）和（f）900 ℃;（g）和（f）为900 ℃时过渡层区域能谱线扫描结果
Figure 4. SEM-BSE images and EDS analysis of the Fe−Al/316SS joints in cross section: (a) and (d) 700 ℃; (b) and (e) 800 ℃; (c) and (f) 900 ℃; (g) and (f) the EDS line scanning result in the transition region at 900 ℃
图 5 Fe−Al/316SS接头抗剪强度-位移曲线
Figure 5. Shear strength-displacement curves of the Fe−Al/316SS joints
图 6 700 ℃连接的Fe−Al/316SS接头剪切测试结果:（a）和（b）断口显微形貌；（c）和（d）能谱分析
Figure 6. Fracture surface SEM images ((a) and (b)) and EDS patterns ((c) and (d)) of the Fe−Al/316SS joints joined at 700 ℃ after shear test
图 7 800 ℃连接的Fe−Al/316SS接头剪切测试断口显微形貌
Figure 7. Fracture surface SEM images of the Fe−Al/316SS joints joined at 800 ℃ after shear test
图 8 900 ℃连接的Fe−Al/316SS接头剪切测试结果:（a）和（b）断口显微形貌；（c）和（d）能谱分析
Figure 8. Fracture surface SEM images ((a) and (b)) and EDS patterns ((c) and (d)) of the Fe−Al/316SS joints joined at 900 ℃ after shear test
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