Fatigue properties of high strength steels microalloyed by complex Al−Ti−N

Authors

Keywords:

endurance limit, fatigue properties, high strength steel, microalloyed by aluminum, titanium and nitrogen, symmetrical alternating loading, fatigue graphs, testing machine UBM

Abstract

Abstract. Purpose of the study. To determine the endurance limit of steels, microalloyed by complex Al−Ti−N, and basic car-building steel 09Mn2Cu by carrying fatigue tests. To assess the level of fatigue characteristics, depending on the structural condition of the investigated steels. Methodology. Fatigue tests were carried out according to State Standard 25.502-79. The main fatigue value of investigated steels, determined during tests, endurance limit σ-1. Tests were carried out with condition symmetrical alternating loading by a testing machine UBM. The type of load during the experiment is a rotating bending load. It were constructed fatigue graphs of investigated steels based on the obtained results. Results. It has been identified the endurance limit value investigateded steels microalloyed by aluminum, titanium and nitrogen in thermostrengthening and hot-rolled conditions as compared to the base car-building 09Mn2Cu steel in hot-rolled condition. Scientific novelty. It was found that the steel, micro-alloyed by aluminum, titanium and nitrogen, has a level of endurance limit corresponding to the requirements of materials for car building. Practical significance. Today there was a demand for low-cost high-strength rolled steel in Ukraine (σT ³ 420 MPa), in particular for car-building needs. It is impossible to meet these requirements without the use of new high performance materials for the components of cars. One of these advanced materials, in our opinion, is a high-strength type 20TiAlN steels. The strength and plastic properties of these steels have been studied previously, and correspond to the level of properties of railroad car. However, the fatigue properties of 20TiAlN type steels have not previously been studied, so the tests to determine the fatigue strength is very important.

Author Biographies

Bol'shakov V. I., State Higher Educational Establishment «Pridneprovsk State Academy of Civil Engineering and Architecture»

Department of Materials Science, Dr. Sc. (Tech.), Prof.

Uzlov O. V., State Higher Educational Establishment «Pridneprovsk State Academy of Civil Engineering and Architecture»

Department of Materials Science, Ph. D., Ass. Prof.

Drozhevskaya H. V., State Higher Educational Establishment «Pridneprovsk State Academy of Civil Engineering and Architecture»

Department of Materials Science, assistent

Kulyk V. V., National University “Lvivs'ka Politechnika”

Department of Applied Materials Science and Materials Engineering, Ph. D., assistant

References

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Published

2016-09-29

Issue

No. 3 (2016): Metal Science and Heat Treatment of Metals

Section

Technical science

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