Superplastic Forming of Duplex Stainless Steel for Aerospace Part

Journal Article · Mon Aug 22 00:00:00 EDT 2011 · AIP Conference Proceedings

DOI:https://doi.org/10.1063/1.3623662· OSTI ID:21611544

Lee, Ho-Sung; Yoon, Jong-Hoon; Yoo, Joon-Tae; Yi, Young-Moo ^[1]

---

1. Korea Aerospace Research Institute, 45 Eoeun-dong Yuseong, Daejeon 305-333 (Korea, Republic of)

In this study, the high temperature forming behavior of duplex stainless steel has been characterized and the outer shell of a combustion chamber was fabricated with pressure difference of hot gas. It consists of two parts which are the outer skin made of stainless steel to sustain the internal pressure and the inner shell made of copper alloy for regenerative cooling channels. Two outer skins partitioned to half with respect to the symmetric axis was prepared by hot gas forming process with a maximum pressure of 7 MPa following to FEM analysis. For inner layer, copper alloy was machined for cooling channels and then placed in the gas pressure welding fixture. It is shown that the optimum condition of gas pressure welding is 7 MPa at 890 deg. C, for one hour. EDX analysis and scanning electron microscope micrograph confirm the atomic diffusion process is observed at the interface and copper atoms diffuse into steel, while iron and chrome atoms diffuse into copper. The result shows that the manufacturing method with superplastic forming and gas pressure welding of steel and copper alloy has been successful for near net shape manufacturing of scaled combustion chamber of launch vehicle.

• OSTI ID: 21611544
• Journal Information: AIP Conference Proceedings, Vol. 1383, Issue 1; Conference: NUMISHEET 2011: 8. international conference and workshop on numerical simulation of 3D sheet metal forming processes, Seoul (Korea, Republic of), 21-26 Aug 2011; Other Information: DOI: 10.1063/1.3623662; (c) 2011 American Institute of Physics; Country of input: International Atomic Energy Agency (IAEA); ISSN 0094-243X
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
42 ENGINEERING
COOLING
COPPER
COPPER ALLOYS
DIFFUSION
FINITE ELEMENT METHOD
INTERFACES
IRON
LAYERS
MANUFACTURING
MECHANICAL ENGINEERING
PLASTICITY
PRESSURE RANGE MEGA PA
SCANNING ELECTRON MICROSCOPY
STAINLESS STEELS
WELDING
ALLOYS
CALCULATION METHODS
CARBON ADDITIONS
ELECTRON MICROSCOPY
ELEMENTS
ENGINEERING
FABRICATION
HIGH ALLOY STEELS
IRON ALLOYS
IRON BASE ALLOYS
JOINING
MATHEMATICAL SOLUTIONS
MECHANICAL PROPERTIES
METALS
MICROSCOPY
NUMERICAL SOLUTION
PRESSURE RANGE
STEELS
TRANSITION ELEMENT ALLOYS
TRANSITION ELEMENTS