Effects of Heat Treatment Procedures and Diamond Burnishing on Tensile Properties and Surface Integrity of Additively Manufactured 17-4PH Steel Cylindrical Parts.
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| Title: | Effects of Heat Treatment Procedures and Diamond Burnishing on Tensile Properties and Surface Integrity of Additively Manufactured 17-4PH Steel Cylindrical Parts. |
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| Authors: | Duncheva, Galya1,2 (AUTHOR) duncheva@tugab.bg, Maximov, Jordan1,2 (AUTHOR), Dunchev, Vladimir1,2,3 (AUTHOR), Anchev, Angel1,2,4 (AUTHOR), Todorov, Vladimir1,2 (AUTHOR), Argirov, Yaroslav2,3 (AUTHOR), Anastasov, Kalin2,3,4 (AUTHOR), Mitev, Hristian2,4 (AUTHOR) |
| Source: | Materials (1996-1944). Jun2026, Vol. 19 Issue 11, p2192. 33p. |
| Subjects: | Heat treatment, Powder bed fusion, Heat treatment of steel, Three-dimensional printing, Surface finishing, Mechanical behavior of materials, Tensile strength, Surface properties |
| Abstract: | This article presents a new combined post-processing concept to improve the quality of laser powder bed fusion (LPBF) of 17-4PH stainless steel (SS) cylindrical parts fabricated from N2-atomised LaserForm 17-4PH (B) powder. The concept is based on consecutive heat treatment procedures and diamond burnishing (DB) processes. A two-stage study was conducted. The first stage was an LPBF process experiment. The following combination of LPBF parameter values was selected after optimisation: a laser power of P = 150 W , laser scanning speed of v = 1200 mm/s, and layer thickness of t = 40 μ m . In the second stage, this combination was used to evaluate the effects of two heat treatment procedures (HT1 and HT2) and two DB processes (using burnishing forces of 100 N and 300 N) on the tensile properties and surface integrity of LPBF 17-4PH SS cylindrical samples. The HT2 procedure, including annealing (1200 ∘ , 4 h) , solution treatment ( 1060 ∘ , 1 h) , cooling ( − 70 ∘ C , 2 h ), and ageing ( 482 ∘ , 4 h ) led to yield limit, tensile strength, and Vickers hardness values of Y L = 1071 M P a , T S = 1410 M P a , and 523 H V , respectively. The concept presented takes advantage of the combination of the transformation, precipitation and strain-hardening effects. The combined effect was most pronounced in the samples subjected to the HT2 procedure and subsequent DB (300 N), for which a retained austenite fraction of 6.93%, surface microhardness of 563 H V 0.05 and the maximum values of the compressive axial and hoop RSs of − 1426.3 M P a and − 1095.9 M P a , respectively, were measured. [ABSTRACT FROM AUTHOR] |
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| Database: | Engineering Source |
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| Abstract: | This article presents a new combined post-processing concept to improve the quality of laser powder bed fusion (LPBF) of 17-4PH stainless steel (SS) cylindrical parts fabricated from N2-atomised LaserForm 17-4PH (B) powder. The concept is based on consecutive heat treatment procedures and diamond burnishing (DB) processes. A two-stage study was conducted. The first stage was an LPBF process experiment. The following combination of LPBF parameter values was selected after optimisation: a laser power of P = 150 W , laser scanning speed of v = 1200 mm/s, and layer thickness of t = 40 μ m . In the second stage, this combination was used to evaluate the effects of two heat treatment procedures (HT1 and HT2) and two DB processes (using burnishing forces of 100 N and 300 N) on the tensile properties and surface integrity of LPBF 17-4PH SS cylindrical samples. The HT2 procedure, including annealing (1200 ∘ , 4 h) , solution treatment ( 1060 ∘ , 1 h) , cooling ( − 70 ∘ C , 2 h ), and ageing ( 482 ∘ , 4 h ) led to yield limit, tensile strength, and Vickers hardness values of Y L = 1071 M P a , T S = 1410 M P a , and 523 H V , respectively. The concept presented takes advantage of the combination of the transformation, precipitation and strain-hardening effects. The combined effect was most pronounced in the samples subjected to the HT2 procedure and subsequent DB (300 N), for which a retained austenite fraction of 6.93%, surface microhardness of 563 H V 0.05 and the maximum values of the compressive axial and hoop RSs of − 1426.3 M P a and − 1095.9 M P a , respectively, were measured. [ABSTRACT FROM AUTHOR] |
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| ISSN: | 19961944 |
| DOI: | 10.3390/ma19112192 |
