Study on Arc Additive Manufacturing Process and Properties of 5356 Aluminum Alloy Rocket Booster Module Transition End Frame

doi:10.3901/JME.2020.08.028

Abstract

Abstract: The arc additive manufacturing process of 5356 aluminum alloy used on rocket booster module transition end frame is investigated. The effects of various heat-input and heat treatment temperature on microstructures and properties of deposited metal are discussed, respectively. Then a solid simulating part of transition end frame is additively manufactured. The experimental results show that the microstructures of 5356 aluminum alloy are mainly:α(Al) matrix and reinforcing-phase β(Al₈Mg₅). As the heat-input lifts from 113.4 J/mm to 356.4 J/mm during the manufacturing, the coarse β(Al₈Mg₅) in 5356 aluminum distributed at the grain boundary of α(Al) increase, which leads to a decrease in tensile strength and elongation. The solution treatment for deposited metal is beneficial to the improvement of its mechanical properties. With solution treatment temperature raising from 350℃ to 450℃, the α(Al) grains in 5356 aluminum alloy get refined and their intracrystalline fine β(Al₈Mg₅) show more precipitation, simultaneously, the coarse β(Al₈Mg₅) distributed at α(Al) grain boundary are reduced, which effectively facilitates the fine-grain strengthening and precipitation strengthening responsible for the strength and toughness lifting of 5356 aluminum alloy. The 5356 aluminum alloy transitional end frame is divided into three parts, namely, bottom supporting ring, ring-fan group and ring-rib group, to additively manufacture in order according to its structural characteristics. In order to reduce the deformation of the formed part, the arc-starting position of additive manufacturing of the bottom supporting ring is changed, and the symmetrical piecemeal forming is carried out on ring-fan group. Three-dimensional measurement of the formed 5356 aluminum alloy transition end frame simulation part shows that the structural error is within 3.58 mm, indicating a high forming precision.

Key words: 5356 aluminum alloy, arc additive manufacturing, transition end frame, microstructures and properties, heat-input, solution treatment

CLC Number:

TG47

GAO Lianling, YU Shengfu, YU Runzhen, HE Tianying, SHI Yusheng. Study on Arc Additive Manufacturing Process and Properties of 5356 Aluminum Alloy Rocket Booster Module Transition End Frame[J]. Journal of Mechanical Engineering, 2020, 56(8): 28-36.

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