2.1 Analysis of the structure of the welded joint The structure of the welded joint presents a coarse columnar crystal form. This is because the base material is a cast FejAl alloy, and there are many chain-like inclusions in the weld of the coarse-grained d sample. As shown. The morphology of the inclusions is as shown. Qualitative performance spectrum analysis of inclusions, see * Energy spectrum analysis can determine the type of inclusions is A1302. And 2 samples welds without inclusions, this is due to flash butt welding process, 2 samples flash more fully, top The reason for the greater forging force.
The distribution of inclusions at the weld seam of the sample morphology of inclusions y fusion line weld i1 hardness curve of the welded joint 2.3 performance analysis of the welded joint The results of the non-standard tensile test of the welded joint show that one sample breaks in the fusion zone, 2 The fracture position of the sample is at the base material away from the flame joint area, and its b value is 306Mpa, which is equivalent to the base material and meets the strength requirements of the joint. One fusion zone contains more inclusions, which weakens the joint strength of the joint to be the tensile fracture morphology of the joint. The fracture of both joints is cleavage fracture, the grain size of the cross section is large, and there are obvious cleavage steps And river tricks.
Welded joint tensile fracture morphology 2.2 Microhardness analysis of welded joints The microhardness of the joints of samples 1 and 2 is shown as shown. It is not difficult to find that 1 specimen has a significant low hardness near the joint area (weld). This is because the effect of the welding heat cycle reduces the degree of ordering of the alloy near the fusion zone, which appears as a decrease in hardness. However, due to the heat treatment after welding, the order of the alloy in the vicinity of the fusion zone was restored, and the hardness did not decrease significantly.
Conclusion 1] In the flash butt welding process of Fe3Al alloy, the oxide inclusions formed due to insufficient upset force are the reasons for the low stress fracture of the joint. The fracture of the joint is cleavage fracture.
Short-term high-temperature tempering treatment after welding makes the joint hardness tend to be uniform.
Flash butt welding method can be used for welding Fe3Al alloy.
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