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Microstructure and properties in friction stir weld of 12Cr steel |
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| Authors: | P. Hua S. Moronov C. Z. Nie Y. S. Sato H. Kokawa S. H. C. Park |
| Affiliation: | 1. School of Materials Science and Engineering, Hefei University of Technology, Hefei 230009, China;2. Department of Materials Processing, Graduate School of Engineering Tohoku University, 6-6-02 Aramaki-aza-Aoba, Aoba-ku, Sendai 980-8579, Japan;3. Department of Materials Processing, Graduate School of Engineering Tohoku University, 6-6-02 Aramaki-aza-Aoba, Aoba-ku, Sendai 980-8579, Japan;4. Hitachi Research Laboratory, Hitachi Ltd, Omika 7-1-1, Hitachi 319-1292, Japan |
| Abstract: | Friction stir welding was employed for joining of 12Cr heat resistant ferritic steel. Microstructure and mechanical properties in the obtained welds were examined and their relationship was established. The stir zone microstructure was found to consist of quenched martensite with numerous fine dispersoids uniformly distributed in grain interiors. The formation of this microstructure remarkably strengthened the stir zone. Tempering for 3·6 ks at 923 K reduced the as welded hardness of friction stir weld to nearly base material level. |
| Keywords: | 12Cr heat resistant ferritic steel Friction stir welding Martensite Microstructure properties relationship |