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中性子回折法を用いた溶接部応力測定の高信頼性化

Reliability improvement for neutron stress measurement of weld joint

鈴木 裕士  ; 秋田 貢一

Suzuki, Hiroshi; Akita, Koichi

これまでは、溶接熱影響に伴う複雑なミクロ組織変化のために、無ひずみ状態の格子定数の扱いが難しく、中性子回折法による信頼性の高い溶接応力の測定が困難であった。しかしながら、本稿に示したように、相変態や粒間ひずみの影響を考慮した適切な測定条件を用いることで、溶接部においても信頼性の高い中性子応力測定が実現できる。また、非破壊測定技術である利点を活かせば、き裂発生などに伴う応力変化なども測定が可能である。中性子回折法は、溶接構造物の残留応力を測定するための重要なツールとして、ひずみゲージなどを用いた機械的計測法との相補的測定手段になり得る。

It has been known to be difficult to measure the residual stress near a weld accurately due to a complex microstructure in a heat affected zone. In this study, we show that the residual stress around the weld can be measured accurately in consideration of the influences of phase transformation and intergranular strains. Furthermore, it is shown that a change in residual stress due to crack propagation near the weld can be measured by the neutron diffraction technique. The neutron diffraction technique can be a complementary measurement technique with a mechanical measurement technique like strain gauges, as an important method to measure residual stresses of welded structures.

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