PSI - Issue 23

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Available online at www.sciencedirect.com Structural Integrity Procedia 00 (2019) 000 – 000 Structural Integrity Procedia 00 (2019) 000 – 000

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ScienceDirect

Procedia Structural Integrity 23 (2019) 493–498

© 2019 The Authors. Published by Elsevier B.V. This is an open access article under the CC BY-NC-ND license (http://creativecommons.org/licenses/by-nc-nd/4.0/) Peer-review under responsibility of the scientific committee of the ICMSMF organizers © 201 9 The Authors. Published by Elsevier B.V. This is an open access article under the CC BY-NC-ND license (http://creativecommons.org/licenses/by-nc-nd/4.0/) Peer-review under responsibility of the scientific committee of the IC MSMF organizers. bending and fatigue damage mechani ms were inves igated with the emph is on fatigue c ack init ation process evalu ted using scanning electron icroscopy. The r sults indicate that surface additive laser wel ed layers of a high quality can be reach d. On the oth r hand, some drop of fatigue resistance and endurance limit was observed, affected by surface defects – small welding imperfections © 201 9 The Authors. Published by Elsevier B.V. This is an ope acces article under CC BY-NC-ND lic nse (http://creativecommon org/licenses/by-nc-nd/4.0/) Peer-review under responsibility of the scientific committee of the IC MSMF organizers. 9th International Conference on Materials Structure and Micromechanics of Fracture Fatigue properties and damage mechanisms of components manufactured by laser additive welding of H13 on S355 steel Ivo Černý a *, Jan Kec a , Stanislav Němeček b , Adam Poloch a , Marie Černá a a SVÚM a.s., Tovární 2053, 250 88 Čelákovice, Czech Republic b RAPTECH s.r.o., U Vodárny 473, 330 08 Zruč -Senec, Czech Republic Laser additive manufacturing is an advanced, very perspective technology with potentially wide industrial applications, one of them being an improvement of durability of forms and dies. The aim is to improve surface properties like wear resistance using special layers of powder sintered or remelted by laser beam. Other possible applications are repairs of worn dies or shape changes. At present, dies are manufactured by machining with following bulk heat treatment, which is an expensive process. Another problem is to find suppliers with big size furnaces and limited capacity often results in long time dates and terms. Concerning repairs of dies, they are usually performed manually, using arc or plasma welding with numerous difficulties and disadvantages in comparison with promising and advanced laser overlaying. The paper contains results of a comprehensive evaluation of several types of hard overlayed powder of H13 tool steel on a S355 structural steel using laser beam. Properties like macro- and microstructure, mechanical properties like hardness and its course in the layers, high-cycle fatigue resistance in bending and fatigue damage mechanisms were investigated with the emphasis on fatigue crack initiation process evaluated using scanning electron microscopy. The results indicated that surface additive laser welded layers of a high quality can be reached. On the other hand, some drop of fatigue resistance and endurance limit was observed, affected by surface defects – small welding imperfections 9th International Conference on Materials Structure and Micromechanics of Fracture Fatigue properties and damage mechanisms of components manufactured by laser additive welding of H13 on S355 steel Ivo Černý a *, Jan Kec a , Stanislav Němeček b , Adam Poloch a , Marie Černá a a SVÚM a s , Tovární 2053, 250 88 Čelákovice, Czech Republic b RAPTECH s.r.o., U Vodárny 473, 330 08 Zruč -Senec, Czech Republic Abstract Laser additive anufacturing is an advanced, very persp ctive technology with potenti lly wid industrial applicatio s, one of th m being an im r vement of durability of forms and dies. The aim is t improve surface prope ties like wear resistance using special layers of powd r sintered or remelted by laser beam. Other possible applications are repairs of worn dies or shape chang s. At present, dies are manufactured by machini g with fo lowing bulk heat tr atment, which is an xpen ive proces Another problem is to find suppliers with big size furnaces nd limited apacity often results in lo g time dates and terms. Concer in repairs of die , they are usually performed manu lly, using arc or plasm weldi g with n merous difficulti s and disadvantages in compari n with promising an advanced laser overlaying. The paper contains results of a com reh ns v ev luatio of several types of hard over ayed powder of H13 tool steel on a S355 structural steel using laser beam. P oper ies like macro- and microstructure, cal prop rties like hardness and its course in the layers, high-cycle fatigue resistance in Abstract

Keywords: Laser additive manufacturing; fatigue; H13 and S355 steels. Keywords: Laser additive manufacturing; fatigue; H13 and S355 steels.

* Corresponding author. Tel.: +420-326-509-050. E-mail address: ivo.cerny@seznam.cz * Correspon ing author. Tel.: +420-326-509-050. E-mail address: ivo.cerny@seznam.cz

2452-3216 © 2019 The Authors. Published by Elsevier B.V. This is an open access article under the CC BY-NC-ND license (http://creativecommons.org/licenses/by-nc-nd/4.0/) Peer-review under responsibility of the scientific committee of the IC MSMF organizers. 2452-3216 © 2019 The Authors. Published by Elsevier B.V. This is an ope acces article under CC BY-NC-ND lic nse (http://creativecommon org/licenses/by-nc-nd/4.0/)

Peer-review under responsibility of the scientific committee of the IC MSMF organizers.

2452-3216 © 2019 The Authors. Published by Elsevier B.V. This is an open access article under the CC BY-NC-ND license (http://creativecommons.org/licenses/by-nc-nd/4.0/) Peer-review under responsibility of the scientific committee of the ICMSMF organizers 10.1016/j.prostr.2020.01.134