激光粉末床熔融数值模拟研究进展

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Abstract：Laser Powder Bed Fusion （LPBF） is a mature technology metal additive manufacturing，with the advantages high forming accuracy，parts density close to 100 % ，which is suitable for complex structure，small size high precision parts.LPBF technology has been used in aerospace，automotive，mold medical other fields.LPBF forming process integrates complex multiple physical chemical phenomena from nano micrometer to micro scale.LPBF is the non-equilibrium freezing behavior extreme speed cooling micro melting pool.It is diffcult to analyze measure the temperature melting pool size by experimental means during the forming processThe physical chemical phenomena heat transfer，masstransfer， collsion LPBF process were introduced firstly. In additionaly，the development trend macroscopic mechanics，powder bed dispersion element， wind field， melting pool， microscopic organization structure optimization in LPBF forming processwerereviewedinthisarticle.

Keywords：macroscopic simulation; discrete element simulation;mesoscopic simulation; topological optimization; laser powder bed fusion

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激光粉末床熔融（LaserPowderBedFusion，LPBF）是金属增材制造的一种成熟技术，高能激光通过对粉末床上的金属粉末按预定路径扫描，粉末吸收激光能量后发生熔化和凝固，激光逐层扫描形成三维实体零件，成形过程在保护气氛中进行，以防止粉末和熔化金属氧化[1]。（剩余18827字）