Lithuanian Journal of Physics article / Lietuvos fizikos žurnalo straipsnis

MECHANICAL PROPERTIES OF 17-4PH STAINLESS STEEL AT VARIOUS LASER SINTERING PROCESS PARAMETERS
Ada Steponavičiūtė^a, Karolis Stravinskas^a, Aušra Selskienė^a, Jurijus Tretjakovas^b, Ričardas Petkus^a, and Genrik Mordas^a
^aCenter for Physical Sciences and Technology, Savanorių 231, 02300 Vilnius, Lithuania
^bVilnius Gediminas Technical University, Saulėtekio 11, 10223 Vilnius, Lithuania
Email: ada.steponaviciute@ftmc.lt

Received 11 January 2024; revised 15 February 2024; accepted 22 February 2024

As a material for conventional manufacturing, iron and its alloys had been an object of numerous studies in the past and, as a result, steel became one of the best-known metal alloys in industry. However, new manufacturing technologies, such as additive manufacturing (AM), open new possibilities for the same materials. In this paper, we investigate stainless steel powder for additive manufacturing technologies and parts fabricated from it. Powder chemical composition and morphology are presented in the study. The influence of laser power and laser scanning speed on the mechanical properties of materials and microstructure was studied, and the experimental results showed the optimal energy density values between 50 and 65 J/mm³. However, the value of energy density varies depending on which parameters are observed, i.e. the optimum energy density value is different for the ultimate tensile stress (UTS) and surface roughness or the Young’s modulus and hardness.
Keywords: additive manufacturing, mechanical properties, microstructure, stainless steel, metal powder

17-4PH NERŪDIJANČIOJO PLIENO MECHANINĖS SAVYBĖS ESANT ĮVAIRIEMS SUKEPINIMO LAZERIU PROCESO PARAMETRAMS
Ada Steponavičiūtė^a, Karolis Stravinskas^a, Aušra Selskienė^a, Jurijus Tretjakovas^b, Ričardas Petkus^a, Genrik Mordas^a

^aFizinių ir technologijos mokslų centras, Vilnius, Lietuva
^bVilniaus Gedimino technikos universitetas, Vilnius, Lietuva

Praeityje geležis ir jos lydiniai, kaip įprastinės gamybinės medžiagos, buvo daugelio tyrimų objektas, dėl to plienas tapo vienu geriausiai žinomų metalo lydinių pramonėje. Tačiau naujos technologijos, tokios kaip adityvioji gamyba, atveria naujas galimybes naudoti tokias pačias medžiagas. Šiame straipsnyje nagrinėjama nerūdijančio plieno milteliai, skirti adityviosios gamybos technologijoms, ir iš jų pagamintos detalės. Tyrime pateikiama miltelių cheminė sudėtis ir morfologija. Buvo ištirta lazerio galios ir skenavimo greičio įtaka medžiagų mechaninėms savybėms ir mikrostruktūrai, o eksperimentiniai rezultatai parodė, kad optimalus energijos tankis yra 50–65 J/mm³. Tačiau energijos tankio vertė skiriasi priklausomai nuo to, kokie parametrai stebimi, t. y. optimali energijos tankio vertė skiriasi, pavyzdžiui, stiprumo ribos ir paviršiaus šiurkštumo arba Jungo modulio ir kietumo atveju.

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