@article{oai:nagoya.repo.nii.ac.jp:00030839,
 author = {Masumoto, Isao},
 issue = {1},
 journal = {Memoirs of the Faculty of Engineering, Nagoya University},
 month = {Oct},
 note = {This report is concerned with the influence of solidified phases on the metallurgical and mechanical properties of steel weld metals. The main object is to clarify the effect of the solubility of a solidified phase on the micro- and macro-segregation of impurities such as sulphur and phosphorus at grain boundaries which is apt to cause solidification cracking and deterioration of toughness and ductility of weld metal, using laboratory heats of carbon steels, nickel steels (both have peritectic reaction), and Ni-Cr steels which have eutectic reaction. Some of the Ni-Cr steels solidify completely as ferritic or austenitic phase. The effect of solidification process and phases on blowhole formation is also discussed and some experimental results are described. The obtained results are summarized as follows: 1. Because of larger solubility of sulphur and phosphorus in alpha (delta) iron than in gamma iron, a weld metal solidified completely as alpha phase has less micro-segregation and crack-susceptibility than a weld metal solidified with gamma phase. 2. Ferritic steel weld metal solidifies generally through peritectic reaction. And the critical value of the beginning of peritectic reaction is about 0.1% carbon content in Fe-C system and about 3.5% nickel content in Fe-Ni system. Weld metal over these critical values has larger micro-segregation and higher solidification crack susceptibility, since the peritectic reaction produces a skin of gamma-phase around primary alpha-phase crystallized metal and solidification completes between gamma-phase boundaries, which increases the micro-segregation of sulphur. 3. The above mentioned facts were again confirmed with Fe-9%Ni and Fe-16%Cr alloys, which solidify completely as gamma- and alpha-phase without any reaction during solidification by cast pin test and trans-varestraint test of TIG weld. 4. Although gamma-iron has larger solubility of nitrogen and hydrogen than delta (alpha) iron, as gamma-phase solidified Fe-9%Ni alloy was much more sensitive to nitrogen blowhole than as alpha-phase solidified Fe-16%Cr alloy. This fact may be due to the effect of chromium on increase of nitrogen solubility in molten metal.},
 pages = {36--67},
 title = {Effect of solidification phases on metallurgical and mechanical behavior of steel weld metals},
 volume = {36},
 year = {1984}
}