A kind of preparation method of high performance fecocrni alloy
A high-performance, high-entropy alloy technology, applied in the field of alloy materials, can solve the problems of immaturity of FeCoCrNi prints and inability to achieve practical applications, and achieve the effect of improving impact toughness
Active Publication Date: 2022-06-24
TIANJIN UNIV
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Problems solved by technology
It is for these reasons that the current post-manufacture annealing process of FeCoCrNi printed parts is not yet mature, and it has been unable to achieve practical application in industry for a long time.
Method used
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Effect test
Embodiment 1
[0052] The FeCoCrNi alloy printed by the laser selective melting method was annealed at 700 ℃ for 1.8 h, and the annealed FeCoCrNi alloy was obtained after cooling. The tensile strength is 710.86±15.65MPa, the residual stress is 167.57±11.69MPa, the impact toughness is 27.98±1.74J, and the elongation after fracture is 28.9±3.1%.
Embodiment 2
[0054] The FeCoCrNi alloy printed by the laser selective melting method was annealed at 800 ℃ for 2.2 h, and the annealed FeCoCrNi alloy was obtained after cooling. The tensile strength is 701.61±8.42MPa, the residual stress is 159.98±8.65MPa, the impact toughness is 33.72±2.26J, and the elongation after fracture is 30.4±2.3%.
Embodiment 3
[0056] The FeCoCrNi alloy printed by the laser selective melting method was annealed at 900 ℃ for 1.8 h, and the annealed FeCoCrNi alloy was obtained after cooling. The tensile strength is 681.04±11.26MPa, the residual stress is 154.94±14.57MPa, the impact toughness is 33.55±1.44J, and the elongation after fracture is 32.5±2.1%.
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Abstract
The invention discloses a method for preparing a high-performance FeCoCrNi alloy, which is characterized in that it comprises the following steps: step 1, using a laser selective melting method to print a high-entropy alloy to prepare a printed FeCoCrNi alloy; the laser selective melting method printing method Gas atomized spherical powder with equimolar ratio of FeCoCrNi is used as raw material; step 2, the printed FeCoCrNi alloy is annealed at 700-1300° C. for 1.75-2.25 hours, and a high-performance FeCoCrNi alloy is obtained after cooling. The annealing process will significantly improve the plasticity, impact toughness and other important indicators that determine the service stability of the parts, and improve the reliability of the actual service of the printed parts. This method is beneficial to promote the actual service process of FeCoCrNi alloy SLM additive manufacturing.
Description
technical field [0001] The invention belongs to the technical field of alloy materials, and in particular relates to a preparation method of a high-performance FeCoCrNi alloy. Background technique [0002] Laser additive manufacturing technology has received more and more attention in recent years due to its advantages in the manufacture of complex structural parts and near-net shape. The application of laser additive manufacturing in the field of high-entropy alloy preparation has also become a research focus in recent years. There are two main branches of laser additive manufacturing, namely laser melting deposition (LMD) and selective laser melting (SLM). LMD technology has a fast forming speed and a large scale, but the forming accuracy is poor, and it usually requires post-processing after machining. Compared with LMD technology, the precision of parts manufactured by SLM technology is extremely high, and the machining error is usually within 30 microns. The principle...
Claims
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IPC IPC(8): C22C33/02B22F3/105B22F3/24B33Y10/00
CPCC22C33/02B22F3/24B33Y10/00B22F2003/248Y02P10/25
Inventor 徐连勇林丹阳荆洪阳韩永典赵雷吕小青
Owner TIANJIN UNIV