Scratch hardness and wear performance of laser-melted steels: Effects of anisotropy

Effects of the orientation of dendrites on the scratch hardness and wear performance of laser-melted steels have been investigated. Scratch experiments have been carried out with a Vickers indenter and wear experiments with a pin-on-disk tester. The deformed structure is investigated, using transmission electron, stereo scanning electron and light microscopy. The scratch experiments reveal a pronounced relation between the scratch hardness and the orientation of dendrites. A model that takes into account the deformed topography of the surface turns out to be consistent with the microstructural investigations. The wear behaviour displays a different dependence on the orientation of dendrites. The concentration of segregated carbides is the predominant factor.

[1]  Wilfried Kurz,et al.  Theory of Microstructural Development during Rapid Solidification , 1986 .

[2]  K. Easterling,et al.  Phase Transformations in Metals and Alloys , 2021 .

[3]  A. Torrance.  An approximate model of abrasive cutting , 1987 .

[4]  A. J. Black,et al.  An investigation of the different regimes of deformation which can occur when a hard wedge slides over a soft surface: The influence of wedge angle, lubrication and prior plastic working of the surface , 1988 .

[5]  W. Boettinger,et al.  Mechanisms of microsegregation-free solidification , 1984 .

[6]  K. Gahr.  Modelling of two-body abrasive wear , 1988 .

[7]  M. D. Vathaire,et al.  An upper bound model of ploughing by a pyramidal indenter , 1981 .

[8]  C. A. Brookes.  Scratch and indentation hardness of crystals , 1981 .

[9]  P. Gilormini,et al.  Theoretical and experimental study of the ploughingof a rigid-plastic semi-infinite body by a rigid pyramidal indenter , 1983 .

[10]  J. D. Hosson,et al.  WEAR INDUCED HARDENING OF LASER PROCESSED CHROMIUM-CARBON STEEL , 1987 .

[11]  E. Hornbogen.  Description and wear of materials with heterogeneous and anisotropic microstructures , 1986 .

[12]  W. T. Roberts,et al.  Plastic deformation and phase transformation in textured austenitic stainless steel , 1970 .

[13]  M. Loretto,et al.  Direct observations of martensite nuclei in stainless steel , 1979 .

[14]  P. Oxley,et al.  An explanation of the different regimes of friction and wear using asperity deformation models , 1979 .

[15]  D. Rigney,et al.  Friction, wear and microstructure of unlubricated austenitic stainless steels☆ , 1980 .

[16]  A. A. Torrance,et al.  A new approach to the mechanics of abrasion , 1981 .

[17]  Abrasive wear resistance of anisotropic two phase Fe-Ni-C steels , 1987 .

[18]  M. Loretto,et al.  In situ observations of the formation of martensite in stainless steel , 1979 .

[19]  W. Kurz,et al.  Fundamentals of Solidification , 1990 .

[20]  Siegfried S. Hecker,et al.  Effects of Strain State and Strain Rate on Deformation-Induced Transformation in 304 Stainless Steel: Part I. Magnetic Measurements and Mechanical Behavior , 1982 .

[21]  Seh Chun Lim,et al.  Overview no. 55 Wear-Mechanism maps , 1987 .