Cold resistance of new casting Cr – Mn – Ni – Mo – N steel. Part 2. Investigation of the factor of non-metallic inclusions particles under static and impact loading at low temperatures

Author:

Kostina M. V.1ORCID,Kudryashov A. E.2,Rigina L. G.3,Muradyan S. O.2,Antonova O. S.2,Kostina V. S.2ORCID

Affiliation:

1. Baikov Institute of Metallurgy and Materials Science, Russian Academy of Sciences; Moscow Aviation Institute (National Research University)

2. Baikov Institute of Metallurgy and Materials Science, Russian Academy of Sciences

3. Baikov Institute of Metallurgy and Materials Science, Russian Academy of Sciences; JSC Russian State Research Center “CNIITMASH”

Abstract

The new casting austenitic Cr – Ni – Mn steel with 0.5 % N (grade 05Kh21AG15N8MFL) surpasses the casting steel of the 18Cr – 10 Ni type used for comparison in the entire range of climatic temperatures. In this part of the article, attention is paid to the particles of non-metallic inclusions (NMI) in the cast metal of nitrous steel as a factor that can affect the mechanical properties under static and impact loading at low temperatures. NMI in laboratory metal are globular oxysulfides, with SiO2 oxides in the central part and an outer layer formed by manganese sulfide MnS, with an average particle size of ~75 % up to 4 μm. It has been established that when testing casting steel for impact bending at –160 °C, these NMI do not serve as a source of crack initiation, do not contribute to their propagation and are in a fracture surface in isolated pits. Under tensile conditions at –110 °C, the yield strength of nitrogen containing steel increases by more than 1.7 times in comparison with the properties at +20 °C; ductility does not decrease when cooled to –110 °C. In this case, NMI particles are strongly deformed due to the development of cracks in their oxide part, and even when NMI reaches the surface of the sample in working part in the neck zone, they do not serve as a source of crack initiation. Cracks at the boundary “NMI/ deforming metal” are not formed. Even with a random arrangement of particles in the form of chains along the axis of application of the tensile load, at a distance of 5 – 20 μm from each other, pores do not form around the particles and merge into a crack nucleus. The results obtained correlate with the literature data that NMI can act as stress relaxers in ductile steels.

Publisher

National University of Science and Technology MISiS

Subject

Metals and Alloys

Reference21 articles.

1. Kostina M.V., Polomoshnov P.Yu., Blinov V.M., Muradyan S.O., Kostina V.S. Cold resistance of new casting Cr – Mn – Ni – Mo – N steel with 0.5 % of N. Part. 1. Izvestiya. Ferrous Metallurgy. 2019, vol. 62, no. 11, pp. 894–906. (In Russ.). https://doi.org/10.17073/0368-0797-2019-11-894-906

2. Gladman T., Holmes B., Pickering F.B. Work hardening of lowcarbon steels. The Journal of the Iron and Steel Institute. 1970, vol.  208, no. 2, pp. 172–183.

3. Pickering F.B. Physical Metallurgy and the Design of Steels. London: Applied Science Publisher Ltd, 1978, 104 p.

4. Gubenko S. Non-Metallic Inclusions and Strength of Steels. Physical Bases of Strength of Steels. Saarbrücken: OmniScriptum Marketing DEU GmbH, 2015, 274 p. (In Russ.).

5. Knott J.F. Fundamentals of Fracture Mechanics. London: Butterworth, 1973, 273 p.

同舟云学术

1.学者识别学者识别

2.学术分析学术分析

3.人才评估人才评估

"同舟云学术"是以全球学者为主线,采集、加工和组织学术论文而形成的新型学术文献查询和分析系统,可以对全球学者进行文献检索和人才价值评估。用户可以通过关注某些学科领域的顶尖人物而持续追踪该领域的学科进展和研究前沿。经过近期的数据扩容,当前同舟云学术共收录了国内外主流学术期刊6万余种,收集的期刊论文及会议论文总量共计约1.5亿篇,并以每天添加12000余篇中外论文的速度递增。我们也可以为用户提供个性化、定制化的学者数据。欢迎来电咨询!咨询电话:010-8811{复制后删除}0370

www.globalauthorid.com

TOP

Copyright © 2019-2024 北京同舟云网络信息技术有限公司
京公网安备11010802033243号  京ICP备18003416号-3