Quantitative Evaluation of Solidification Brittleness of Weld Metal during Solidification by In-Situ Observation and Measurement (Report IV) : Effect of Grain-Boundary Sliding on Strain-Rate Dependence of Critical Strain Required for Solidification Crack

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Tensile hot cracking test, Trans-Varestraint cracking test and simulated hot ductility test have been carried out for stainless steels and Inconel alloy. The aim of this work is to investigate the next three phenomena from grain-boundary sliding. Namely: (1) the critical strain required for solidification crack initiation increases with an increase in strain rate. (2) the strain rate dependence increases with a decrease in crack susceptibility, and (3) the critical strain in the high strain rate is more sensitive to compare the crack susceptibilities among materials than that in the low strain rate. Grain-boundary sliding has occurred at solidification grain-boundary of weld metal during solidification under the condition of low strain rate. Then, these phenomena in the above have been explained from the view point of contribution of grain-boundary sliding to total strain of weld metal.
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