For straight columnar dendritic grains growing side by side, |dT/d(fS)1/2| (T: temperature; fS: fraction solid) near their roots can be the crack-susceptibility index as verified against welds made with an elliptical weld pool. This study showed the index is also valid for welds made with a teardrop-shaped pool. In both cases, at the mushy-zone centreline, the tips of such grains grow and finally become the roots as the mushy-zone moves forward. This validity is consistent with: (1) the crack-susceptibility ranking of alloys in arc welding (typically elliptical pool) being similar to that in laser- or electron-beam welding (typically teardrop-shaped pool), and (2) the ranking calculated based on the index being consistent with that observed in laser- or electron-beam welding.
KouS.Welding metallurgy. 3rd ed.Hoboken, NJ: John Wiley and Sons; 2020.
2.
KouS.A criterion for cracking during solidification. Acta Mater. 2015; 88:366–374.
3.
KouS.A simple index for predicting the susceptibility to solidification cracking. Weld J. 2015; 94(12):374s–388s.
4.
RappazM, DrezetJM, GremaudM.A new hot-tearing criterion. Metall Mater Trans A. 1999; 30:449–455.
5.
ClyneTW, DaviesGJ.The influence of composition on solidification cracking susceptibility in binary alloy systems British foundryman. Br Foun. 1981; 74:65–73.
6.
FisherDJ, KurzW. Unpublished Research. Department of Materials, EPFL-Swiss Institute of Technology Lausanne, Switzerland; 1978.
7.
SoysalT, KouS.A simple test for assessing solidification cracking susceptibility and checking validity of susceptibility prediction. Acta Mater. 2018; 143:181–197.
8.
SoysalT, KouS.Predicting effect of filler metals on solidification cracking susceptibility of 2024 and 6061 Al. Sci Technol Weld Joining. 2019; 24(6):559–565.
9.
LiuJ, DuarteHP, KouS.Evidence of back diffusion reducing cracking during solidification. Acta Mater. 2017; 122:47–59.
10.
LiuJ, KouS.Effect of diffusion on susceptibility to cracking during solidification. Acta Mater. 2015; 100:359–368.
11.
LiuK, KouS.Susceptibility of magnesium alloys to solidification cracking. Sci Technol Weld Joining. 2020; 25(3):251–257.
12.
XiaC, KouS.Evaluating susceptibility of Ni-base alloys to solidification cracking by transverse-motion weldability test. Sci Technol Weld Joining. 2020; 25(8):690–697.
13.
XiaC, KouS.Calculating the susceptibility of carbon steels to solidification cracking during welding. Metall Mater Trans B. 2021; 52:460–469.
14.
GittosMF, BirchSMI, PargeterRJ. Solidification cracking susceptibility in C-Mn Steel CO2 laser welds. In: Hot Cracking Phenomena in Welds III. Springer. 2011-02-15, p. 225–262.
15.
AgarwalG, KumarA, RichardsonIM, Evaluation of solidification cracking susceptibility during laser welding in advanced high strength automotive steels. Mater Des. 2019; 183:108104.
16.
KouS, LeY.The effect of quenching on the solidification structure and transformation behavior of stainless steel welds. Metall Trans A. 1982; 13:1141–1152.
17.
HuB, RichardsonIM.Mechanism and possible solution for transverse solidification cracking in laser welding of high strength aluminium alloys. Mater Sci Eng A. 2006; 429(1–2):287–294.
18.
ChunEJ, BabaH, NishimotoK, Development of laser beam welding transverse-Varestraint test for assessment of solidification cracking susceptibility in laser welds. Met Mater Int. 2015; 21(3):543–553.
19.
MatsudaF, NakataK.A new test specimen for self-restraint solidification crack susceptibility test of electron-beam welding bead. Trans JWRI. 1982; 11(2):87–94.
20.
SoysalT, KouS.A simple test for solidification cracking susceptibility and filler metal effect. Weld J. 2017; 96:389-s–401-s.
21.
WangW, XiongL, WangD, A new test method for evaluation of solidification cracking susceptibility of stainless steel during laser welding. Materials. 2020; 13(14):3178.
22.
LiuK, YuP, KouS.Susceptibility of stainless steels to solidification cracking: new test and explanation. Weld J. 2020; 99:255-s–270-s.
