耐熱 Cr-Mo 鋼の熔接試驗(第 2 報)
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概要
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In the previous report, we tried tests of hardness, tension, bending and micro-structure and confirmed generation of so-called "Ferrite band" as the result of heat treatment in case of using the austenitic stainless steel electrode. In order to investigation this boundary defect, we tried tests of high temperature tension, temperature of generation of "Ferrite band" and corrosion in view of general use under high temperature. The results obtained were as follows; i) In the high temperature tention test of 4∿6% Cr-1/2% Mo steel, in as weld they were broken down at the weld metal and in semi-soft anneal at the base metal in case of using austenitic stainless steel electrode. In case of using suitable compatible composion electrode, in semi-soft anneal they were broken down at the weld metal and in full anneal at the base metal, which show whether the heat treatment is proper or not. ii) In the test of 9% Cr-1% Mo steel, they were broken down at the base metal in any case. iii) The "Ferrite band" generated by heat treatment in room temperature test with austenitic stainless steel electrode did not apeared in high temperature tension test. iv) Indication of generation of "Ferrite band" begins to appear from the temperature over 500℃. v) The corrosion resisting property of "Ferrite band" is so decreased that it is corroded in 5% H_2SO_4 by boiling for only ten hours. It is worthy of special notice that the "Ferrite band" is corroded even in as weld.
- 社団法人溶接学会の論文
- 1956-08-25