Substantiation of rational replacement material for connecting hoses brake system of railways rolling stock

Authors

  • K. I. Uzlov Materials science department, National metallurgical academy of Ukraine, pr. Gagarina, 4, 49600, Dnepropetrovsk, Ukraine, tel. +38 (097) 950-14-08, +38 (095) 416-97-70, Ukraine https://orcid.org/0000-0003-0744-9890

Keywords:

coupling brake hoses system, railways rolling stock, malleable cast irons, nodular graphite cast iron, austempering, microstructure, mechanical properties

Abstract

Purpose. Purpose of the work was study of structure and mechanical properties of cast irons with different shape of graphite including their thermal treatment, to support rational replacement material connecting hoses break system. Methodology. Material studies were malleable according to GOST 1215 and high strength according to DSTU 3925 irons for the manufacture of hoses brake system according to GOST 2593. Heat treatment of cast irons matrix conducted on lab equipment according to adopted in industrial practice modes of austempering. Mechanical tests on static tension conducted according to GOST 1497 on testing machine «Instron». Impact toughness tests were carried out in accordance with GOST 9454 on pendulum machine PSW-5. Hardness studied using testing equipment TB 5004 according to requirements of GOST 9012. Metallographic analysis was carried out on manufactured according to standard methods of GOST 3443 microscopic specimens by using of microscope «Neophot-2». Findings. Data analysis of microstructure research and mechanical trials demonstrated a significant dependence of the plasticity of cast iron from graphite inclusions form. This shows that elongation insignificantly varies depending on the type of metal matrix. It was discovered that, instead, the hardness is mainly determined by the matrix of iron. Comparative analysis of mechanical properties of both the investigated types of cast irons with various graphite shape and different type of metal matrix fixed during the transition from the ferrite structure to pearlite falling relative elongation in almost ten times. It was shown in the work unconditional perceptiveness of cast irons with graphite component isothermal hardening in terms of their mechanical and exploitations properties increasing. Originality. Absolute advantage of cast irons with nodular graphite iron, both in terms of plastic and strength characteristics compared with malleable irons with compact branched form of graphite has been determined. Achievement of nodular graphite iron after austempering mechanical characteristics, that prevailing relevant indicators for malleable cast irons allowed considering the thermal strengthening by isothermal quenching method as an additional argument in favor of use the high-strength cast irons in heat treated condition for metal elements manufacturing for railways rolling stock brake system. Practical value. Obtained in the work results were the basis for rational replacement of material connecting hoses brake system rolling stock of railways according to GOST 2593 by globular graphite iron according to DSTU 3925. Such a technological implementation clearly can be seen also as a preferential for use in terms of saving energy, in the first place - natural gas, taking into account the peculiarities of technological processes of industrial production of malleable and high strength cast irons.

Author Biography

K. I. Uzlov, Materials science department, National metallurgical academy of Ukraine, pr. Gagarina, 4, 49600, Dnepropetrovsk, Ukraine, tel. +38 (097) 950-14-08, +38 (095) 416-97-70

Dr. Sc. (Tech.).

References

ДСТУ 3925 - 99 «Чавун з кулястим графітом для виливків. Марки» DSTU 3925 - 99 «Spheroidal graphite iron for casting. Grades» http: //www. ukrndnc .org. ua/index. php?option=com ushop&Ite mid=69&grp=1054&pgrp=1063&lstdssu=1065

Комплексна програма оновлення залізничного рухомого складу України на 2008 - 2020 роки [Текст] / Укрзалізниця. - Київ, 2009. - 299 с.

Kompleksna programa onovlennya zallznichnogo ruhomogo skladu Ukrayiny na 2008 - 2020 roki [The complex program of updating of railway rolling stock of Ukraine on 2008 - 2020] Ukrzaliznitsya, Kiyiv, 2009. 299 p. http://www.mtu.gov.ua/ru/news/print/9092.html

Узлов К. І. Аналіз фундаментальних положень та сучасних уявлень про зсувано-дифузійну перекристалізацію аустеніту у залізовуглецевих сплавах / К. І. Узлов // Фундаментальные и прикладные проблемы черной металлургии: Сб. научн. тр. — Дніпропетровськ.: ІЧМ НАН України, 2008. — Вип. 18. — С. 186-199.

Uzlov K. I. Analiz fundamentalnih polozhen ta suchasnih uyavlen pro zsuvano-difuziynu perekristalizatsiyu austenitu u zalizovugletsevih splavah [Analysis of fundamental provisionsand modern ideas about shear - diffusion recrystallization of austenite in iron - carbon alloys] Fundamentalnyie i prikladnyie problemyi chernoy metallurgii: Sb. nauchn. tr. — Dnipropetrovsk.: IChM NAN Ukrayiny, 2008, issue 18, P. 186­199 http://dspace.nbuv.gov.ua/xmlui/handle/123456789/62722

Бунин К. П. Основы металлографии чугуна / К. П. Бунин, Я. Н. Малиночка, Ю. Н. Таран. - М. : Металлургия, 1969. - 416 с.

Bunin K. P., Malinochka Ya. N., Taran Yu. N. Osnovyi metallografii chuguna [Basics of cast iron metallographic analysis] Moscow, Metallurgiya, 1969. 416 p. http: //www.libex.ru/detail/book535001.html

Бунин К. П. Строение чугуна / К. П. Бунин, Ю. Н. Таран. - М. : Металлургия, 1972. - 160 с.

Bunin K. P., Taran Yu. N. Stroenie chuguna [Structure of cast iron] Moscow, Metallurgiya, 1972. 160 p. https://books.google.com.ua/books?id=AqioGwAACAAJ&dq=Бунин.+Таран+Строение+чугунов&Ы

ГОСТ 1215 - 79 «Отливки из ковкого чугуна. Общие технические условия»GOST 1215 - 79 «Malleable iron castings. General specifications» http://vsegost.com/Catalog/24/24204.shtml7.

ГОСТ 1497 - 84 «Металлы. Методы испытаний на растяжение»GOST 1497 - 84 «Metals. Methods of tension test» http: //vsegost.com/Catalog/30/30103.shtml

ГОСТ 2593 - 2009 «Рукава соединительные для тормозов железнодорожного состава. Технические условия»

GOST 2593 - 2009 «Coupling air brake hoses for railway rolling stock. Specifications» http://vsegost.com/Catalog/49/49788.shtml

ГОСТ 3443 - 87 «Отливки из чугуна с различной формой графита. Методы определения структуры»

GOST 3443 - 87 «Cast iron castings with graphite of different form. Methods of structure determination» http: //vsegost.com/Catalog/30/30103.shtml

ГОСТ 9012 - 59 «Металлы. Метод измерения твердости по Бринеллю» GOST 9012 - 59 «Metals. Method of Brinell hardness measurement» http: //vsegost.com/Catalog/30/30103.shtml

ГОСТ 9454 - 78 «Металлы. Метод испытания на ударный изгиб при пониженных, комнатной и повышенных температурах» g Os T 9454 - 78 «Metals. Method for testing the impact strength at low, room and high temperature» http: //vsegost.com/Catalog/30/30103.shtml

Неижко И. Г. Термическая обработка чугуна / И. Г. Неижко. - Киев : Наук. думка, 1992. - 208 с.

Neizhko I. G. Termicheskaya obrabotka chuguna [Cast iron heat treatment] Kiev, Nauk. dumka, 1992. 208 p. http://ntb.misis.ru:591/OpacUnicode/index.php?url=/notices/index/IdNotice:111820/Source:default

Сокол Э. Н. Механизм железнодорожно­транспортного происшествия: его содержание и форма / 3. Н. Сокол // Залізничний транспорт України. - 2008. - №4. - С. 58-60.

Sokol E. N. Mehanizm zheleznodorozhno-transportnogo proisshestviya: ego soderzhanie i forma [Mechanism of rail accident: its content and form] Zaliznichniy transport Ukrayiny, 2008, № 4, P. 58-60. http://scbist.com/knigi-i-zhumalv/1571-zheleznodorozhnvitransport.html

Узлов К. И. Сравнительный анализ механических свойств термоупрочнённых чугунов с различной формой графитной составляющей / К. И. Узлов, А. Н. Хулин, Ж. А. Дементьева // В сб. 6-й Международной Конференции «Оборудование и технологи термической обработки метал лов и сплавов», ч.П, Харьков, 2005. -С.13-15.

Uzlov K. I., Hulin A. N., Dementeva Zh. A. Sravnitelnyiy analiz mehanicheskih svoystv termouprochnYonnyih chugunok s razlichnoy formoy grafitnoy sostavlyayuschey [Comparative analysis of mechanical properties of heat treated cast irons with different shapes of graphite component] V sb. 6-y Mezhdunarodnoy Konferentsii «Oborudovanie i tehnologi termicheskoy obrabotki metal lov i splavov», ch.II, [ 6th International Conference «Equipment and technology of metals and alloys heat treatment»] Harkov, 2005. P. 13-15. www.ottom.com.ua

Узлов К. И. Разработка нормативной документации на изотермически закаленный высокопрочный чугун с бейнитной матрицей / К. И. Узлов, А. Н. Хулин, Ж. А. Дементьева, [и др.] // Металлургическая и горнорудная промышленность. - 2007. - № 3. - С. 46-48.

Uzlov K. I., Hulin A. N., Dementeva Zh. A. [i dr.] Razrabotka normativnoy dokumentatsii na izotermicheski zakalennyiy vyisokoprochnyiy chugun s beynitnoy matritsey [Elaboration of normative documentation for isothermally hardened cast iron with bainite matrix] Metallurgicheskaya i gornorudnaya promyishlennost [Metallurgical and mining industry] 2007. № 3. P. 46-48. http://www.metaljournal.com.ua/mgp-02-2007/

Elliott R. Cast Iron Technology / R. Elliott. - London, Boston, Singapore, Sydney, Toronto, Wellington: Butterworths, 1988. - 244 p. Elliott R. Cast Iron Technology. London, Boston, Singapore, Sydney, Toronto, Wellington: Butterworths, 1988. 244 p.http://trove.nla.gov.au/work/13611346?selectedversion=NBD5646233

Published

2015-04-20

Issue

Section

Proceedings in memory of Starodubov