Measurement of Diffusible Hydrogen Content and Hydrogen Effects on the Cracking Potential of Duplex Stainless Steel Weldments (Part I)(Materials, Metallurgy & Weldability)
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概要
- 論文の詳細を見る
The variation in the hydrogen content was achived by employing a controlled electrode baking schedule, which varied the moisture content of the electrode coating and thus the hydrogen avaiable to the weld pool. Three different SMAW electrodes were employed with a variation in ferrite content achieved by coating control (depositing welds of three different chemistries). Cracking susceptibility of welds with different ferrite contents at four hydrogen levels were carried out with "Y-Groove" cracking test. Hydrogen content was measured using the AWS standard method (45℃, 72 hours) and with an elevated extraction scheme. (1) The diffusible hydrogen in duplex stainless steel weldments determined at 45℃ (weld metals of FN 73, 96.5 and 103) is negligibly small. (2) The diffusible hydrogen content increases with an increase in extraction temperature up to 600℃ and remains essentially constant at 25ml/100gm to 950℃ for an extraction time of 1 hour. (3) The diffusible hydrogen content for extraction at 200℃ for 72 hours (>20ml/100gm) approaches that measured for 600°and 950℃ for 1 hour. (4) "Y-Groove" test results show that cracking occurs in weld metals of FN 73.5, 95 and 103 made with "green" unbaked electorodes (25ml/100gm diffusible hydrogen). Cracking does not occur in weld metals of FN 73.5 and 95 when "green" electrodes baked above 315℃ are employed. For weld metal of FN 103, a "green" electrode baking temperature of 370℃ is needed to eliminate craking in the "Y-Groove" test. (5) The critical diffusible hydrogen content for weld metal cracking is estimated to be 15ml/100gm for FN 73.5 and 95 weld metals and 10ml/100gm for FN 103 weld metal.
- 大阪大学の論文
著者
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KIKUCHI Yasushi
Osaka University
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Lundin Carl
The Univ. Of Tennessee Knoxville Tn
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Lundin Carl
The University Of Tennessee
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KHAN K.K.
The University of Tennessee
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KHAN K.
The University of Tennessee
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