シャルピー衝撃試験法によるアルミニウム合金溶接部の超低温下における破壊特性について

小林 俊郎; 石田 末重

doi:10.2464/jilm.22.9_555

Fracture characteristics of aluminum alloy welds in Charpy impact test at super-low temperatures

Toshiro KOBAYASHI, Sueshige ISHIDA

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JOURNAL FREE ACCESS

1972 Volume 22 Issue 9 Pages 555-563

DOI https://doi.org/10.2464/jilm.22.9_555

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Published: September 30, 1972 Received: May 26, 1972 Available on J-STAGE: July 23, 2008 Accepted: - Advance online publication: - Revised: -
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Date of correction: July 23, 2008 Reason for correction: - Correction: ABSTRACT Details: Wrong : Following the previous study¹⁾, the present paper reports tensile properties and impact fracture characteri-stics of naturally aged TIG welds, 2-pass and 3-pass welds with welding rods of an Al-Mg alloy 5356, of T4-treated Al-Zn-Mg and annealed Al-Mg plates between room temperature and-196°C.
The instrumented Charpy test revealed that the impact values of the above two welds were fairly decreased at-196°C. It was found that this decrease was caused by the reduction in crack-initiation and crack-propaga-tion energies. Further, the reduction of ductility in terms of the deflection in Charpy impact test was observed at -196°C.
Fracture load of Al-Zn-Mg alloy in Charpy tests was observed to increase at low temperature in the same manner as tensile strength in tensile test. On the contrary, fracture load of Al-Mg alloy welds in Charpy test de-creased at -196°C. This phenomenon had also been observed in mother plate¹⁾ and was believed to be characteristic of Al-Mg alloy.
Low temperature brittleness in welds was more remarkable than that in mother plates. It was shown from the fractographic observation that this embrittlement was caused by the intergranular or the interdendritic brittle fracture.
Right : Following the previous study¹⁾, the present paper reports tensile properties and impact fracture characteristics of naturally aged TIG welds, 2-pass and 3-pass welds with welding rods of an Al-Mg alloy 5356, of T4-treated Al-Zn-Mg and annealed Al-Mg plates between room temperature and-196°C.
The instrumented Charpy test revealed that the impact values of the above two welds were fairly decreased at-196°C. It was found that this decrease was caused by the reduction in crack-initiation and crack-propagation energies. Further, the reduction of ductility in terms of the deflection in Charpy impact test was observed at -196°C.
Fracture load of Al-Zn-Mg alloy in Charpy tests was observed to increase at low temperature in the same manner as tensile strength in tensile test. On the contrary, fracture load of Al-Mg alloy welds in Charpy test decreased at -196°C. This phenomenon had also been observed in mother plate¹⁾ and was believed to be characteristic of Al-Mg alloy.
Low temperature brittleness in welds was more remarkable than that in mother plates. It was shown from the fractographic observation that this embrittlement was caused by the intergranular or the interdendritic brittle fracture.

Date of correction: July 23, 2008 Reason for correction: - Correction: PDF FILE Details: -

Abstract

Following the previous study¹⁾, the present paper reports tensile properties and impact fracture characteristics of naturally aged TIG welds, 2-pass and 3-pass welds with welding rods of an Al-Mg alloy 5356, of T4-treated Al-Zn-Mg and annealed Al-Mg plates between room temperature and-196°C.
The instrumented Charpy test revealed that the impact values of the above two welds were fairly decreased at-196°C. It was found that this decrease was caused by the reduction in crack-initiation and crack-propagation energies. Further, the reduction of ductility in terms of the deflection in Charpy impact test was observed at -196°C.
Fracture load of Al-Zn-Mg alloy in Charpy tests was observed to increase at low temperature in the same manner as tensile strength in tensile test. On the contrary, fracture load of Al-Mg alloy welds in Charpy test decreased at -196°C. This phenomenon had also been observed in mother plate¹⁾ and was believed to be characteristic of Al-Mg alloy.
Low temperature brittleness in welds was more remarkable than that in mother plates. It was shown from the fractographic observation that this embrittlement was caused by the intergranular or the interdendritic brittle fracture.

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