Stress relaxation of inconel 718 superalloy manufactured by selective laser melting (SLM)

IF 3 2区工程技术 Q2 ENGINEERING, MECHANICAL

International Journal of Pressure Vessels and Piping Pub Date : 2025-01-20 DOI:10.1016/j.ijpvp.2025.105442

Sh Alikarami, S. Nakhodchi

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Abstract

Stress relaxation behaviour of Inconel 718 superalloy manufactured by selective laser melting (SLM) at the temperatures rang of 650–750 °C and 2 % strain were experimentally investigated and compared with IN718 forged material. During SLM manufacturing process the material is exposed to the cyclic thermal histories and fast local solidification process. Therefore, internal stresses are generated in the component during the SLM process and they may impact the material performance and cause early failure. Stress relaxation in the components such as fasteners may alter the integrity of the whole structure. It was found that the relaxation behavior of the SLM IN718 specimens are differs from forged manufactured specimens. The comparison results show that the decrease of relaxation limit for SLM specimens is more than 90 % when the temperature rises from 650 °C to 750 °C which is much higher than that of forged specimens. The stress relaxation stability of forged specimens is higher than that of SLM specimens at all tested temperatures. The homogenization and solution heat treatment process was performed on SLMed IN718 specimen shows a higher stress relaxation rate compared with as-received SLMed specimens. The stress exponent, n, for power law creep relation was determined for SLMed and forged IN718 at 700 °C and it was found that dislocation motion predominantly controls the stress relaxation mechanism in the IN718 alloy at this temperature. The investigations reveal that the analytical results closely matched the results obtained from experiments.

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来源期刊

International Journal of Pressure Vessels and Piping 工程技术-工程：机械

CiteScore

5.30

自引率

13.30%

发文量

208

审稿时长

17 months

期刊介绍： Pressure vessel engineering technology is of importance in many branches of industry. This journal publishes the latest research results and related information on all its associated aspects, with particular emphasis on the structural integrity assessment, maintenance and life extension of pressurised process engineering plants. The anticipated coverage of the International Journal of Pressure Vessels and Piping ranges from simple mass-produced pressure vessels to large custom-built vessels and tanks. Pressure vessels technology is a developing field, and contributions on the following topics will therefore be welcome: • Pressure vessel engineering • Structural integrity assessment • Design methods • Codes and standards • Fabrication and welding • Materials properties requirements • Inspection and quality management • Maintenance and life extension • Ageing and environmental effects • Life management Of particular importance are papers covering aspects of significant practical application which could lead to major improvements in economy, reliability and useful life. While most accepted papers represent the results of original applied research, critical reviews of topical interest by world-leading experts will also appear from time to time. International Journal of Pressure Vessels and Piping is indispensable reading for engineering professionals involved in the energy, petrochemicals, process plant, transport, aerospace and related industries; for manufacturers of pressure vessels and ancillary equipment; and for academics pursuing research in these areas.