Microstructures and mechanical behavior of the bimetallic additively-manufactured structure（BAMS） of austenitic stainless steel and Inconel 625
来源期刊：JOURNAL OF MATERIALS SCIENCE TECHNOLOG2021年第15期
论文作者：Md.R.U.Ahsan Xuesong Fan Gi-Jeong Seo Changwook Ji Mark Noakes rzej Nycz Peter K.Liaw Duck Bong Kim
摘 要：Bimetallic additively manufactured structures（BAMSs） can replace traditionally-fabricated functionallygraded-components through fusion welding processes and can eliminate locally-deteriorated mechanical properties arising from post-processing. The present work fabricates a BAMS by sequentially depositing the austenitic stainless-steel and Inconel625 using a gas-metal-arc-welding（GMAW）-based wire + arc additive manufacturing（WAAM） system. Elemental mapping shows a smooth compositional transition at the interface without any segregation. Both materials being the face-center-cubic（FCC） austenite, the electron backscattered diffraction（EBSD） analysis of the interface shows the smooth and cross-interfacecrystallographic growth of long-elongated grains in the <001> direction. The hardness values were within the range of 220–240 HV for both materials without a large deviation at the interface. Due to the controlled thermal history, mechanical testing yielded a consistent result with the ultimate tensile strength and elongation of 600 MPa and 40 %, respectively, with the failure location on the stainless-steel side. This study demonstrates that WAAM has the potential to fabricate BAMS with controlled properties.
Md.R.U.Ahsan1，Xuesong Fan2，Gi-Jeong Seo3，Changwook Ji4，Mark Noakes5，rzej Nycz5，Peter K.Liaw2，Duck Bong Kim3
1. Department of Mechanical Engineering, Tennessee Technological University2. Department of Materials Science and Engineering, The University of Tennessee3. Department of Manufacturing and Engineering Technology, Tennessee Technological University4. Advanced Forming Process R&D Group, Korea Institute of Industrial Technology5. Oak Ridge National Laboratory
摘 要：Bimetallic additively manufactured structures（BAMSs） can replace traditionally-fabricated functionallygraded-components through fusion welding processes and can eliminate locally-deteriorated mechanical properties arising from post-processing. The present work fabricates a BAMS by sequentially depositing the austenitic stainless-steel and Inconel625 using a gas-metal-arc-welding（GMAW）-based wire + arc additive manufacturing（WAAM） system. Elemental mapping shows a smooth compositional transition at the interface without any segregation. Both materials being the face-center-cubic（FCC） austenite, the electron backscattered diffraction（EBSD） analysis of the interface shows the smooth and cross-interfacecrystallographic growth of long-elongated grains in the <001> direction. The hardness values were within the range of 220–240 HV for both materials without a large deviation at the interface. Due to the controlled thermal history, mechanical testing yielded a consistent result with the ultimate tensile strength and elongation of 600 MPa and 40 %, respectively, with the failure location on the stainless-steel side. This study demonstrates that WAAM has the potential to fabricate BAMS with controlled properties.
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