1256 弁バネ用Si-Cr鋼オイルテンパー線のねじり予負荷による残留応力に及ぼす焼戻温度の影響(G03-9 材料力学(9)疲労・強度2,21世紀地球環境革命の機械工学:人・マイクロナノ・エネルギー・環境)

抄録

In the manufacturing process, oil-tempered wire is tempered at around 450℃ before coiling process. Though, there is no paper about changes of mechanical properties by changing of tempering temperature. In this report, mechanical properties and residual stress after torsion preloading of oil-tempered chromium-silicon steel wire for valve spring are investigated. The residual stress after torsion preloading is measured by X-ray stress measurement system with 2 dimensioned PSPC. From the experimental results, the mechanical properties by changing of tempering temperature are obtained. However, the results of residual shear stress after torsion preloading are measured not so high as calculated values. It is supposed that the calculated values are not considered anisotropy which derives from wire drawing processing. We schedule to measure mechanical properties in cross section henceforth.