Cold spray additive manufacturing of Invar 36 alloy: microstructure,thermal expansion and mechanical properties
来源期刊：JOURNAL OF MATERIALS SCIENCE TECHNOLOG2021年第13期
论文作者：Chaoyue Chen Yingchun Xie Longtao Liu Ruixin Zhao Xiaoli Jin Shanqing Li Renzhong Huang Jiang Wang Hanlin Liao Zhongming Ren
摘 要：In this work,the Invar 36 alloys were manufactured using cold spray（CS） additive manufacturing technique.The systematic investigations were made on the microstructural evolution,thermal expansion and mechanical properties under as-sprayed（AS） and heat-treated（HT） conditions.XRD（X-ray diffraction）and ICP-AES（inductively coupled plasma atomic emission spectroscopy） analyses show that no phase transformation,oxidation,nor element content change have occurred.The X-ray computed tomography（XCT） exhibited a near fully dense structure with a porosity of 0.025% in the helium-produced sample under as-sprayed condition,whereas the nitrogen-produced samples produced at 5 MPa and 800℃show more irregular pore defects.He-AS sample shows a more prominent grain refinement than that of nitrogen samples due to the more extensive plastic deformation.The post heat-treatment exhibited a promoted grain growth,inter-particle diffusion,as well as the formation of annealing twins.Between25℃ and 200℃,the nitrogen samples possessed lower CTE（coefficient of thermal expansion） values(1.53 × 10-6/℃) compared with those produced by casting and laser additive manufacturing.The He-AS samples exhibited a noticeable negative CTE value between 25℃ and 200℃,which may due to the significant compressive residual stress（-272 MPa） compensating its displacement with temperature increase during CTE test.The N2-HT and He-HT Invar 36 samples present a notable balance between strength and ductility.In conclusion,the CS technique can be considered as a potential method to produce the Invar36 component with high thermal and mechanical performance.
Chaoyue Chen1，Yingchun Xie2，Longtao Liu1，Ruixin Zhao1，Xiaoli Jin3，Shanqing Li3，Renzhong Huang2，Jiang Wang1，Hanlin Liao4，Zhongming Ren1
1. State Key Laboratory of Advanced Special Steels, School of Materials Science and Engineering, Shanghai University2. Guangdong Academy of Science, Guangdong Institute of New Materials, National Engineering Laboratory for Modern Materials Surface Engineering Technology, The Key Lab of Guangdong for Modern Surface Engineering Technology3. Research Institute, Baoshan Iron & Steel Co., Ltd4. ICB UMR 6303, CNRS, Univ.Bourgogne Franche-Comté,UTBM
摘 要：In this work,the Invar 36 alloys were manufactured using cold spray（CS） additive manufacturing technique.The systematic investigations were made on the microstructural evolution,thermal expansion and mechanical properties under as-sprayed（AS） and heat-treated（HT） conditions.XRD（X-ray diffraction）and ICP-AES（inductively coupled plasma atomic emission spectroscopy） analyses show that no phase transformation,oxidation,nor element content change have occurred.The X-ray computed tomography（XCT） exhibited a near fully dense structure with a porosity of 0.025% in the helium-produced sample under as-sprayed condition,whereas the nitrogen-produced samples produced at 5 MPa and 800℃show more irregular pore defects.He-AS sample shows a more prominent grain refinement than that of nitrogen samples due to the more extensive plastic deformation.The post heat-treatment exhibited a promoted grain growth,inter-particle diffusion,as well as the formation of annealing twins.Between25℃ and 200℃,the nitrogen samples possessed lower CTE（coefficient of thermal expansion） values(1.53 × 10-6/℃) compared with those produced by casting and laser additive manufacturing.The He-AS samples exhibited a noticeable negative CTE value between 25℃ and 200℃,which may due to the significant compressive residual stress（-272 MPa） compensating its displacement with temperature increase during CTE test.The N2-HT and He-HT Invar 36 samples present a notable balance between strength and ductility.In conclusion,the CS technique can be considered as a potential method to produce the Invar36 component with high thermal and mechanical performance.
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