Advanced studies on the hot working stability and hardening mechanism of maraging steels – MEDUR

 

Funding agency:  CEEX - AMCESIT, Project no. 297/2006

Coordinator: “Politehnica” University, Bucharest - BIOMAT, Project Leader: Prof. Dr. Eng. Mihai BRANZEI

Partners:

University of Craiova, Project manager for Partner : Prof. Dr. Ion Vladimirescu

INOE 2000, Project manager for Partner: Dr. Viorel Braic

University of Pitesti, Project manager for Partner, Dr. Catalin Ducu

SC Prelucrari Metalurgice PROD SRL, Project manager for Partner, Eng. Dorel Nedelcu

SC Hripsimecom SRL, Project manager for Partner, Eng. Nina Jalba

 

Objectives

Hardening of maraging steels

 

Specific objectives for INOE 2000:

                        -     Duplex technology for surface hardening of the maraging steel: ion nitriding and MoSi2 deposition by magnetron sputtering.

 

Results:

 

Auger electron spectroscopy (AES) signature of the maraging steel

 

 

 

 

 

Sample of maraging steel during ion nitriding treatment

 

 

 

 

 

 

AES signature of the MoSi2 coating deposited by magnetron sputtering

 

 

AES signature of the maraging steel with Mo coating, before diffusional thermal treatment

 

 

AES signature of the maraging steel with Mo coating, after the diffusional thermal treatment

 

 

 

 

Diffractogram of the maraging steel with Mo coating, after the diffusional thermal treatment

 

 

 

 

 

 

 

 

AES signature of the maraging steel after ionic nitridation

 

 

 

 

 

 

 

Relative intensities of the lines N2+ (391.4 nm) and N2 (380.5 nm) vs. hydrogen concentration in the analyzed plasma in the ionic nitridation chamber.

 

 

 

 

 

Relative intensities of the lines Hα  (656.3 nm) and Hβ (486.1) vs. hydrogen concentration in the analyzed plasma in the ionic nitridation chamber.

 

 

 

 

 

 

Relative intensities of the Fe line  (372 nm) vs. hydrogen concentration in the analyzed plasma in the ionic nitridation chamber.

 

 

 

Hardness of the maraging steel after different treatments – best treatment: M2.

 

Sample

M1 (ion nitridation + MoSi2 coating)

M2 (MoSi2 coating + ion nitridation)

Nitrided maraging steel

Maraging

HV 40

530 ± 5

825 ± 8

540  ± 5

380 ± 4

 

Papers published and presented at national and international conferences

  1. On some characteristics of nanometer-scale NbN/TiAlN multilayers, A. Vladescu, A. Popescu, A. Kiss, M. Braic, M. Balaceanu, V. Braic, I. Tudor, V-th International Conf. on Advanced Materials, ROCAM-2006, Abs.194-195, Sept. 11-14th 2006, Bucharest
  2. Superhard nanostructured coatings designed to be used as protective coatings against wear, V.Braic, M.Balaceanu, C.N. Zoita, A.Kiss, C.M.Cotrut,  M.Braic, S.Zamfir, A.Vladescu, Workshop Thin films design and applications, 24 February 2007, Brasov, Romania
  3. Effects of substrate ion bombardment on characteristics of vacuum-arc plasma deposited hard coatings”, Mihai Balaceanu, Viorel Braic, Catalin Nicolae Zoita, , Adrian Emil Kiss, Alina Vladescu, A XXIII-a Conferinta internationala ISDEIV International Symposium on Discharges and Electrical Insulation in Vacuum, Bucharest, Sept. 2008.
  4. Mecahnical and structural properties of duplex trated maraging steel, V. Malinovschi, M. Balaceanu, I. Nedelcu, S. Moga, M. Braic, V. Braic, D. Negrea, C. Ducu, E-MRS Spring Meeting, 8-12 June 2009, Strasbourg, France