Effects of filler metal composition on the microstructure and mechanical properties for ER NiCrFe-7 multi-pass weldments

Effects of Boron on the Microstructure, Ductility-dip-cracking, and Tensile Properties for NiCrFe-7 Weld Metal

“…shows the DDC in the WM-B1 weld metal. DDC is a solid-state hot cracking, which is observed along GBs because of GB embrittlement [14][15][16] . Table 2 Statistics of the length and number of DDC in the weld metals shows the statistics of the length and number of DDC in the weld metals, and WM-B1 has the significant longer crack length and more crack number than that of WM-B0.…”

“…Reference source not found. ), which is caused by DDC in the WMs [15] . WM-B1 has more DDC in the weld metal, which has more rough face area.…”

“…However, it has been pointed out that NiCrFe-7 weld metal is susceptible to ductility-dip-cracking (DDC) under heavy restraint conditions such as welding thick components [10][11][12][13] . DDC is a solid-state hot cracking, caused by GB embrittlement at homologous temperatures that ranges from about 0.5 to 0.8 of the alloy melting points, which is observed at grain boundaries (GBs) [14,15] . DDC has been investigated extensively from various perspectives, such as chemical composition [15,16] , elements segregating at GBs [17][18][19][20] , precipitation behavior [12] , GB migration [14,[21][22][23][24][25] , peak temperature and cooling rate [26] and so on.…”

“…DDC is a solid-state hot cracking, caused by GB embrittlement at homologous temperatures that ranges from about 0.5 to 0.8 of the alloy melting points, which is observed at grain boundaries (GBs) [14,15] . DDC has been investigated extensively from various perspectives, such as chemical composition [15,16] , elements segregating at GBs [17][18][19][20] , precipitation behavior [12] , GB migration [14,[21][22][23][24][25] , peak temperature and cooling rate [26] and so on. Filler metal composition, such as S, P, H, C, Ti, Ta, Mo, La, Ce, and Nb, has a strong effect on DDC formation in austenitic weldments.…”

Effect of Various Annealing Temperature on Microstructure and Properties of Metastable β-Type Ti-35Nb-2Ta-3Zr Alloy for Biomedical Applications

“…Figure 6 shows the surface morphology of the tensile fracture of the alloys at different annealing temperatures by SEM. The fracture appearances of the four types of samples are generally shown as dimples, indicating ductile fracture except for the sample with an annealing temperature of 923 K (Mo et al, 2015;Mo et al, 2013). The dimple size, distribution, and depth of each sample are different.…”