Microstructure and Fracture Toughness of Fe–Nb Dissimilar Welded Joints

The relation between the microstructure and mechanical properties of the Fe–Nb dissimilar joint were investigated using nanoindentation. The weld metal consists mainly of Fe2Nb, α-Fe + Fe2Nb, Nb (s,s) and Fe7Nb6 phases. Radial cracks initiate from the corners of the impressions on the Fe2Nb phase (~...

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Veröffentlicht in:	Metals (Basel ) 2021-01, Vol.11 (1), p.86
Hauptverfasser:	Chu, Qiaoling, Zhang, Lin, Xia, Tuo, Cheng, Peng, Zheng, Jianming, Zhang, Min, Li, Jihong, Yan, Fuxue, Yan, Cheng
Format:	Artikel
Sprache:	eng
Schlagworte:	Alloys Cracks Dissimilar material joining Dissimilar metals Fracture toughness Intermetallic compounds intermetallics Iron Lamellar structure Mechanical properties Microstructure Nanoindentation Niobium Peak load Stainless steel Weld metal Welded joints welding
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Zusammenfassung:	The relation between the microstructure and mechanical properties of the Fe–Nb dissimilar joint were investigated using nanoindentation. The weld metal consists mainly of Fe2Nb, α-Fe + Fe2Nb, Nb (s,s) and Fe7Nb6 phases. Radial cracks initiate from the corners of the impressions on the Fe2Nb phase (~20.5 GPa) when subjected to a peak load of 300 mN, whereas the fine lamellar structures (α-Fe + Fe2Nb) with an average hardness of 6.5 GPa are free from cracks. The calculated fracture toughness of the Fe2Nb intermetallics is 1.41 ± 0.53 MPam1/2. A simplified scenario of weld formation together with the thermal cycle is proposed to elaborate the way local phase determined the mechanical properties.
ISSN:	2075-4701 2075-4701
DOI:	10.3390/met11010086