高炭素鋼の溶接継手に関する基礎的研究(第1報) -溶接熱影響部の再現熱処理による衝撃特性について-

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Nowadays, on account of the public harm and other reasons, a railroad is thought better of and is gradually developing in spite of the progress of an automobile and an airplane. A railroad line is one of the most important elements upon comfortability, safety, maintenance and expenses of a railroad. It is the most difficult point that we make a railroad line by weldipg as long as we can, and there is a hard problem in the welding. It is said that a rail with the sorbite structure, a rail with heat-treated head, has about treble as long life as a general rail with the pearlite structute, (though it also depends upon a curved radius,) but, at present, only the welding of a general rail is put to practical use. We would like to research into the welding of the rail with heat-treated head someday. But at first, by using the same materials the rail, we used the heat-treat materials as base ones which were changed into those with the same sorbite structure and the same hardness as the heat-treated rail. In order to synthesize the welded heat-affected zone, from the temperature of 600℃ to 1300℃, we heated and air cooled those materials every 100℃. We investigated the impact properties of those and also of the base materials. As a result of this, the best is that heated and air cooled at 700℃, and the worst is at 1300℃. We report the correlations the impact properties have with the microstructure and the grain size.
津山工業高等専門学校の論文
1977-03-15

高炭素鋼の溶接継手に関する基礎的研究(第1報) -溶接熱影響部の再現熱処理による衝撃特性について-

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