Microstructural studies of direct-laser-deposited stainless steel 316L-Si on 316L base material

被引:13
作者
Belsvik, Marius Aga [1 ]
Tucho, Wakshum M. [1 ]
Hansen, Vidar [1 ]
机构
[1] Univ Stavanger, Dept Mech & Struct Engn & Mat Sci, N-4036 Stavanger, Norway
来源
SN APPLIED SCIENCES | 2020年 / 2卷 / 12期
关键词
Additive manufacturing; 316L-Si stainless steel; Microstructure; Secondary phase; Porosity; Hardness; MECHANICAL-PROPERTIES; SOLIDIFICATION; CORROSION;
D O I
10.1007/s42452-020-03530-3
中图分类号
O [数理科学和化学]; P [天文学、地球科学]; Q [生物科学]; N [自然科学总论];
学科分类号
07 ; 0710 ; 09 ;
摘要
Microstructure and hardness of SS316L-Si deposited by direct laser deposition (DLD) on a conventional SS316L base material are studied. The DLD process produced a crack-free metallic part with a density of similar to 99.5%. The as-deposited samples exhibit a microstructure with millimetre-sized solidified melt pools. They consist mainly of columnar dendrites which were formed preferentially along < 001 > direction, generating solidification texture and columnar grains. Dendrites with cellular morphology were also formed in regions of higher solidification rates, mainly above the localized heat-affected zone in the layers.The deposited SS316L-Si contains a primary austenitic matrix and secondary delta-ferrite in the interdendritic regions. The average hardness measured along parallel and normal surfaces with respect to the building direction is nearly the same (similar to 185 HV), indicating homogeneity in the microstructure of the as-deposited SS316L-Si along the two orthogonal surfaces. The analysis of microstructure, defects and intermetallic phases was carried out using optical microscopy, scanning electron microscopy and transmission electron microscopy.
引用
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页数:15
相关论文
共 41 条
  • [1] A.A.S.M. Inc, 2018, AISI TYP 316L STAINL
  • [2] A. International, 2017, E3112017 ASTM A INT
  • [3] [Anonymous], 2013, INT J MECH ENG ROB R
  • [4] Dilution and microsegregation in dissimilar metal welds between super austenitic stainless steel and nickel base alloys
    Banovic, SW
    DuPont, JN
    Marder, AR
    [J]. SCIENCE AND TECHNOLOGY OF WELDING AND JOINING, 2002, 7 (06) : 374 - 383
  • [5] Tensile properties of a nanocrystalline 316L austenitic stainless steel
    Chen, XH
    Lu, J
    Lu, L
    Lu, K
    [J]. SCRIPTA MATERIALIA, 2005, 52 (10) : 1039 - 1044
  • [6] David S.A., 1981, FERRITE MORPHOLOGY V, P36
  • [7] MICROSTRUCTURAL DEVELOPMENT DURING SOLIDIFICATION OF STAINLESS-STEEL ALLOYS
    ELMER, JW
    ALLEN, SM
    EAGAR, TW
    [J]. METALLURGICAL TRANSACTIONS A-PHYSICAL METALLURGY AND MATERIALS SCIENCE, 1989, 20 (10): : 2117 - 2131
  • [8] Eo DR, MAT DESIGN
  • [9] Studies on pitting corrosion and sensitization in laser rapid manufactured specimens of type 316L stainless steel
    Ganesh, P.
    Giri, Raju
    Kaul, R.
    Sankar, P. Ram
    Tiwari, Pragya
    Atulkar, Ashok
    Porwal, R. K.
    Dayal, R. K.
    Kukrej, L. M.
    [J]. MATERIALS & DESIGN, 2012, 39 : 509 - 521
  • [10] Epitaxial laser metal forming:: analysis of microstructure formation
    Gäumann, M
    Henry, S
    Cléton, F
    Wagnière, JD
    Kurz, W
    [J]. MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING, 1999, 271 (1-2): : 232 - 241