各種耐熱鋼の高温疲労およびクリープ・ラプチャー強度
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概要
- 論文の詳細を見る
We have practiced high temp. fatigue tests and creep rupture tests on seven kinds of heat resisting steels, and have examined the method of obtaining the allowable stress value and also various phenomenon incidental to these tests. Some of these specimens contains a chemical content non-standardized, but we have given them regular heat treatment in our tests. Fatigue tests of rotary-bending type was practiced at a revolving speed of 3000 rpm, aiming at N=10^7〜2×10^7 cycles, and creep rupture tests were carried out up to 1000〜2000 hours. The results of the above tests are tabulated in this report, and the high temp. strength of respective test specimens are found to be the values generally acknowledged so far and they involve nothing particular to explain. Here, we only wish to add our opinion concerning the method of assuming the allowable stress against long term of life and also a few points we noticed about it, which are as follows : (1) In the high temp. Fatigue, it seems that endurance limit of Ferritic Heat Resisting Steel is not observed above 400℃ and that of Austenitic Heat Resisting Alloy above 600℃, and at higher temperatures than these degrees, it is considered preferable to obtain strength equivalent to 10^5 hours by straight line extrapolating of S-N curves on the double logarithmic graph and to regard this strength as the allowable stress against long term fatigue. (2) When we tried to extrapolate 10^5 hours creep ruptures strength from 1000 hours data, it was noted that about 30 % difference of strength was recognized among direct extrapolation on the double logarithmic graph, Larson-Miller Method and Manson-Haferd Method. Here it is to be noticed that Manson-Haferd Method, the method which is reputed nowadays as the most accurate one, brought about the lowest value, it is deemed the safest in the process of obtaining the allowable stress to use Manson-Haferd Method, although careful examination of this method is indispensable.
- 社団法人日本材料学会の論文
- 1961-03-15
著者
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会田 博
新三菱重工業(株)神戸造船所
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砂本 大造
新三菱重工(株)神戸造船所
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会田 博
新三菱重工業株式会社神戸造船所
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砂本 大造
住友金属重工中央技術研究所
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藤原 昌晴
三菱重工業(株)
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藤原 昌晴
新三菱重工業株式会社神戸造船所
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