調質高張力鋼の機械的性質におよぼすシヨットブラストの影響

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Fatigue strength of a quenched and tempered steel does not increase so much as the static strength increases in mill scaled state or in welded joints. Therefore, the authors have made a study on the effect of shot blasting and subsequent heat treatment on the mechanical properties of two quenched and tempered steels as one of the means for improving the fatigue strength of a high tensile steel. The results indicate that shot blasting raises the pulsating tension fatigue limit by about 10 to 50% on both quenched and tempered plate and welded joints. The treatment alone heating up to just below the A_1 transformation temperature followed by a rapid cooling, hardly improved the fatigue strength of a plate, while in case of welded joints it was as much effective as shot blasting. The aging after shot blasting gave a favourable effect on the fatigue strength, however, it lowered the toughness of surface region and the shear lips in full thickness V-Charpy impact test specimen tested at low temperatures were little observed. On the other hand, when the test was conducted after shot blasting and tempering treatment, heating up to just below the A_1 transformation temperature followed by quenching from the temperature, both fatigue strength and toughness of surface region were excellent. The results also indicate that the shot blasting treatment between normal pressure quenching and tempering process brought forth the same effect as stated before. The heat treatment after shot blasting could be replaced by line heating treatment and even with the line heating treatment alone the fatigue strength was fairly improved so long as welded joints were concerned. With the shot blasting and following aging treatment the fracture transition temperature of V-Charpy impact test was transferred upward by about 10℃, however, the NDT temperature of the NRL drop weight test was slightly influenced.
社団法人溶接学会の論文
1965-03-25

調質高張力鋼の機械的性質におよぼすシヨットブラストの影響

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