Details
| Original language | English |
|---|---|
| Pages (from-to) | 135-142 |
| Number of pages | 8 |
| Journal | International journal of fatigue |
| Volume | 102 |
| Publication status | Published - 11 May 2017 |
Abstract
Currently, additively manufactured (AM) parts have a high initial surface roughness after the manufacturing process, which can be a limitation for application in highly stressed and cyclically loaded areas. In the present study, Ti-6Al-4V samples were manufactured by laser beam melting, annealed and hot isostatically pressed afterwards. They showed an initial surface roughness of Ra = 17.9 μm depending on their build direction (45°). Subsequently, four different mechanical surface finishing processes were applied separately on plates and fatigue coupons in order to reduce the surface roughness: Milling, blasting, vibratory grinding and a micro machining process. The effectiveness of each treatment is evaluated with respect to the surface topography, as well as the fatigue properties based on axial fatigue tests performed in accordance to DIN EN 6072. The initial roughness could often be reduced to values Ra < 1 μm. The roughness decrease led to a substantial increase in the fatigue performance from initially 300 MPa to a maximum of 775 MPa (after 3 × 107 cycles).
Keywords
- Additive manufacturing, Blasting, High-cycle fatigue, Laser beam, Micro machining process, Milling, Surface roughness, Surface treatments, Ti-6Al-4V, Titanium, Vibratory grinding
ASJC Scopus subject areas
- Mathematics(all)
- Modelling and Simulation
- Materials Science(all)
- General Materials Science
- Engineering(all)
- Mechanics of Materials
- Engineering(all)
- Mechanical Engineering
- Engineering(all)
- Industrial and Manufacturing Engineering
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In: International journal of fatigue, Vol. 102, 11.05.2017, p. 135-142.
Research output: Contribution to journal › Article › Research › peer review
}
TY - JOUR
T1 - Application of mechanical surface finishing processes for roughness reduction and fatigue improvement of additively manufactured Ti-6Al-4V parts
AU - Bagehorn, S.
AU - Wehr, J.
AU - Maier, H. J.
PY - 2017/5/11
Y1 - 2017/5/11
N2 - Currently, additively manufactured (AM) parts have a high initial surface roughness after the manufacturing process, which can be a limitation for application in highly stressed and cyclically loaded areas. In the present study, Ti-6Al-4V samples were manufactured by laser beam melting, annealed and hot isostatically pressed afterwards. They showed an initial surface roughness of Ra = 17.9 μm depending on their build direction (45°). Subsequently, four different mechanical surface finishing processes were applied separately on plates and fatigue coupons in order to reduce the surface roughness: Milling, blasting, vibratory grinding and a micro machining process. The effectiveness of each treatment is evaluated with respect to the surface topography, as well as the fatigue properties based on axial fatigue tests performed in accordance to DIN EN 6072. The initial roughness could often be reduced to values Ra < 1 μm. The roughness decrease led to a substantial increase in the fatigue performance from initially 300 MPa to a maximum of 775 MPa (after 3 × 107 cycles).
AB - Currently, additively manufactured (AM) parts have a high initial surface roughness after the manufacturing process, which can be a limitation for application in highly stressed and cyclically loaded areas. In the present study, Ti-6Al-4V samples were manufactured by laser beam melting, annealed and hot isostatically pressed afterwards. They showed an initial surface roughness of Ra = 17.9 μm depending on their build direction (45°). Subsequently, four different mechanical surface finishing processes were applied separately on plates and fatigue coupons in order to reduce the surface roughness: Milling, blasting, vibratory grinding and a micro machining process. The effectiveness of each treatment is evaluated with respect to the surface topography, as well as the fatigue properties based on axial fatigue tests performed in accordance to DIN EN 6072. The initial roughness could often be reduced to values Ra < 1 μm. The roughness decrease led to a substantial increase in the fatigue performance from initially 300 MPa to a maximum of 775 MPa (after 3 × 107 cycles).
KW - Additive manufacturing
KW - Blasting
KW - High-cycle fatigue
KW - Laser beam
KW - Micro machining process
KW - Milling
KW - Surface roughness
KW - Surface treatments
KW - Ti-6Al-4V
KW - Titanium
KW - Vibratory grinding
UR - http://www.scopus.com/inward/record.url?scp=85019237794&partnerID=8YFLogxK
U2 - 10.1016/j.ijfatigue.2017.05.008
DO - 10.1016/j.ijfatigue.2017.05.008
M3 - Article
AN - SCOPUS:85019237794
VL - 102
SP - 135
EP - 142
JO - International journal of fatigue
JF - International journal of fatigue
SN - 0142-1123
ER -