報告書番号

Q06011

タイトル（和文）

EBSPによる塑性ひずみおよび加工硬化量の簡易定量評価手法の確立 －SUS316L溶接熱影響部の硬化因子定量化への適用－

タイトル（英文）

Establishment of simplified quantitative evaluation method for plastic strain and work hardening by EBSP technique -An application to quantify the work hardening on weld heat affected zones in SUS316L stainless steel-

概要 （図表や脚注は「報告書全文」に掲載しております）

SUS316L溶体化材の引張および圧延試料を用いて、EBSP測定と硬度試験を行い、塑性ひずみ・加工硬化量の簡易評価方法を確立した。また、その評価方法をSUS316L(TP)溶接材のHAZ部評価に適用し、動的ひずみ時効による硬化量と加工硬化による硬化量を定量的に分離評価することが出来た。

概要 （英文）

The Electron Backscattering Pattern(EBSP) measurements and micro Vickers hardness tests were conducted on type 316L stainless steel(SS) reference specimens having plastic strains induced by a tensile test or cold rolling. From the measurements on the reference specimens, calibration curves were successfully obtained for the relationship between the averaged misorientation from the nearest neighbors and plastic strain or micro Vickers hardness in type 316L SS. The EBSP techniques to evaluate strain and hardness were applied for the heat affected zones(HAZ) in TIG welded type 316L(TP) SS with welding materials of 18Cr-16Ni-2Mo steel, SMW-316LC and YUS170. The calculated maximum plastic strain and hardness increment were 10 - 15% and 50 - 70 Hv at the weld fusion line, respectively. Micro Vickers hardness tests showed that the maximum hardness region was located on 2 mm away from the weld fusion line. It was suggested that the strain aging during weld process increased the hardness by 50 Hv on HAZ in type 316L(TP).

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