Open AccessEffects of Process Parameters on the Structure and Hardness of Components in Laser Direct Metal Forming
Author(s) -
H Wang,
X H Liu,
Bin Han,
JunYou Lin,
Xing Han
Publication year - 2019
Publication title -
iop conference series. materials science and engineering
Language(s) - English
Resource type - Journals
eISSN - 1757-899X
pISSN - 1757-8981
DOI - 10.1088/1757-899x/631/2/022028
Subject(s) - materials science , laser power scaling , microstructure , rapid prototyping , laser , metallurgy , cladding (metalworking) , metal powder , alloy , process variable , forming processes , grain size , remanufacturing , composite material , process (computing) , metal , mechanical engineering , optics , computer science , physics , engineering , operating system
As a typical additive manufacturing (AM) technology, Laser Metal Direct Forming(LMDF) integrates the characteristics of laser cladding technology and rapid prototyping technology. Because LMDF process has important application value in the field of rapid mould manufacturing and additive remanufacturing process, the effects of main technological parameters (laser power, powder feeding rate and scanning speed) on the microstructure and hardness in the process of forming were studied. To verify this influence rule, the experimental study on LDMF with different process parameter combinations were carried out with 45 steel as matrix and iron-based alloy powder as cladding material. Experimental results was consistent with the theoretical analysis results. In a word, experiments show that LMDF process can obtain uniform and compact metal cladding layer. The forming process parameters and their reasonable matching are closely related to the structure and performance of components. With the increase of laser power, the grain size of metallographic structure increases and the hardness decreases. To a certain extent, properly increasing the scanning speed and powder feeding rate can refine the grain size of metallographic structure, which increased the hardness of the component and enhancing its surface wear resistance.