High Cycle Fatigue Performance of LPBF 304L Stainless Steel at Nominal and Optimized Parameters
| Autor: | Frank W. Liou, Yitao Chen, Tan Pan, Mohammad Masud Parvez, Sreekar Karnati, Joseph William Newkirk |
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| Jazyk: | angličtina |
| Rok vydání: | 2020 |
| Předmět: |
Fabrication
Materials science Bending (metalworking) 304L stainless steel 02 engineering and technology lcsh:Technology Displacement (vector) Article simply supported bending 0203 mechanical engineering miniature specimen Ultimate tensile strength General Materials Science Composite material lcsh:Microscopy Tensile testing impact toughness test lcsh:QC120-168.85 Fusion lcsh:QH201-278.5 lcsh:T tensile test Particle displacement fatigue test 021001 nanoscience & nanotechnology Fatigue limit 020303 mechanical engineering & transports lcsh:TA1-2040 nucleation and propagation lcsh:Descriptive and experimental mechanics lcsh:Electrical engineering. Electronics. Nuclear engineering 0210 nano-technology lcsh:Engineering (General). Civil engineering (General) additive manufacturing lcsh:TK1-9971 |
| Zdroj: | Materials, Vol 13, Iss 1591, p 1591 (2020) Materials Volume 13 Issue 7 |
| ISSN: | 1996-1944 |
| Popis: | In additive manufacturing, the variation of the fabrication process parameters influences the mechanical properties of a material such as tensile strength, impact toughness, hardness, fatigue strength, and so forth, but fatigue testing of metals fabricated with all different sets of process parameters is a very expensive and time-consuming process. Therefore, the nominal process parameters by means of minimum energy input were first identified for a dense part and then the optimized process parameters were determined based on the tensile and impact toughness test results obtained for 304L stainless steel deposited in laser powder bed fusion (LPBF) process. Later, the high cycle fatigue performance was investigated for the material built with these two sets of parameters at horizontal, vertical, and inclined orientation. In this paper, displacement controlled fully reversed (R = &minus 1) bending type fatigue tests at different levels of displacement amplitude were performed on Krouse type miniature specimens. The test results were compared and analyzed by applying the control signal monitoring (CSM) method. The analysis shows that specimen built-in horizontal direction for optimized parameters demonstrates the highest fatigue strength while the vertical specimen built with nominal parameters exhibits the lowest strength. |
| Databáze: | OpenAIRE |
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