Quantitative Evaluation of Solidification Brittleness of Weld Metal during Solidification by In-Situ Observation and Measurement (Report II) : Solidification Ductility Curves for Steels with the MISO Technique(Materials, Metallurgy & Weldability)

概要

論文の詳細を見る
Ductility curves of weld metals during weld solidification for tentative plain carbon steels, austenitic stainless steels, and Inconel alloy were constructed by means of the MISO technique and the solidification crack susceptibility of the materials was discussed using minimum ductility required to cause cracking (ε_<min>), brittleness temperature range (BTR), and critical strain rate for temperature drop (CST). Influences of carbon, phosphorus and sulphur content on the solidification crack susceptibility were also investigated. It was shown that the values of ε_<min> measured by the MISO technique were about one order higher than those measured by ordinary method in all materials. Consequently, ε_<min> could be successfully measured even in SUS310S and Inconel 600 which had been difficult to be measured. To evaluate the solidification crack susceptibility of austenitic stainless steels, it would be more proper to use ε_<min> which explains the practical tendency much more than BTR or CST. Crack initiation site could be observed in detail and it was revealed that the crack initiation temperature existed very near liquidus temperature except for 0.16% carbon steel.
大阪大学の論文