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- W48260984 abstract "Cracking in Rene'41 weldments is evaluated. Results of metallographic and acoustic-emission analyses are included. It is noted that the exclusion of oxygen from the heat-treating environment does not eliminate postweld cracking of Rene' 41. Vacuum heat treating, as contrasted with heating of air, has a beneficial effect comparable to that obtained by simply lowerning the weld energy input. Use of a vacuum environment slightly increases the on-heating temperature at which gross cracking occurs; this increase was similar to that achieved with weldments produced by lower weld energy input techniques. The primary benefit obtained by the exclusion of oxygen is an increase in the resistance to gross crack extension. Acoustic emission analyses revealed that the mode of cracking shifts from predominately rapid (unstable) crack growth in air to less rapid (stable) crack extension in vacuum. Consequently, the use of vacuum for heat treating might prove useful for components in which the restraint stresses are near threshold'' value; that is, where restraint conditions are just sufficient to create some or intermittent cracking difficulties when heat treating in air. An increased resistance to crack propagation with vacuum heat treatment was also revealed by replica and scanning electron microscopy; microplasticity features were more prevalentmore » in the fractures of specimens heat treated in vacuum than they were on air atmosphere test fractures. As an approach to avoiding heat treat cracking, the exclusion of oxygen from the furnace atmosphere would be useful in any general fracture control plan. Except under marginal restraint conditions, the use of an oxygen-free furnace atmosphere is not, in itself, sufficient for eliminating postweld heat treat cracking. (auth)« less" @default.
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- W48260984 date "1973-12-01" @default.
- W48260984 modified "2023-09-23" @default.
- W48260984 title "Effect of furnace atmosphere on heat-treat cracking of Rene 41 weldments" @default.
- W48260984 hasPublicationYear "1973" @default.
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