Pub Date : 2023-10-11DOI: 10.15588/1607-6885-2023-3-11
N. Yevsyeyeva, V. Borziy, R. Sukhonos, S. Bezhenov
RESEARCH OF THE INFLUENCE OF THE NOZZLE HOLES OF INJECTOR ON THE CHARACTERISTICS OF THE U2D6 DIESEL ENGINE
喷油器喷嘴孔对u2d6柴油机特性影响的研究
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Pub Date : 2023-10-09DOI: 10.15588/1607-6885-2023-3-3
V. Hrabovskyi, V. Kaniuka, O. Lysytsia, A. Yershov
Purpose. To study the effectiveness of additional (along with vanadium) alloying of high-nitrogen austenitic chromium-manganese steels with molybdenum to determine the prospects for their use instead of high-temperature resistant serial martensitic stamped steels. Research methods. Metallographic, durometric, tensile and impact strength tests at room and high temperatures.. Results. The peculiarities of dispersion hardening and microstructures of the investigated high-nitrogen austenitic chromium-manganese steels alloyed with vanadium and molybdenum were determined. The mechanical properties of the selected steels were determined depending on the content of strengthening alloying elements. Significant advantages in the high-temperature (750 and 850 °C) strength of high-nitrogen austenitic chromium-manganese steels alloyed with vanadium and molybdenum were found compared to the serial high-temperature stamping steel 5Х3В3МФС (ДИ23). The highest hardness and strength values correspond to the research steel 60Х11Г16АФ2М2, which allows us to recommend it as an effective substitute for die steels when required to provide increased resistance to high-temperature dehardening of hot-die tools. Scientific novelty. An abnormal presence of a minimum on the dispersion hardening curves of high-nitrogen austenitic chromium-manganese steels with molybdenum and its shift towards a shorter aging duration with increasing aging temperature have been determined. The formation of large particles of primary excess phases with increasing vanadium and molybdenum content in steels was revealed. The dependence of strength and ductility characteristics on the total alloying of the studied austenitic chromium-manganese steels with nitrogen and carbon was established. Practical value. The effectiveness of molybdenum alloying along with vanadium in high-nitrogen austenitic chromium-manganese steels has been established to provide significant (1.5...2.5 times) advantages in high-temperature strength compared to heat-resistant commerciall stamped steels.. The research steel 60Х11Г16АФ2М2 may be the most promising substitute for die steels under high force loads at operating temperatures of 750 °C and above.
{"title":"PROSPECTS FOR USE AS SUBSTITUTES OF HEAT-RESISTANT DIE STEELS, HIGH-NITROGEN AUSTENITIC CHROMIUM-MANGANESE STEELS WITH VANADIUM AND MOLYBDENUM","authors":"V. Hrabovskyi, V. Kaniuka, O. Lysytsia, A. Yershov","doi":"10.15588/1607-6885-2023-3-3","DOIUrl":"https://doi.org/10.15588/1607-6885-2023-3-3","url":null,"abstract":"Purpose. To study the effectiveness of additional (along with vanadium) alloying of high-nitrogen austenitic chromium-manganese steels with molybdenum to determine the prospects for their use instead of high-temperature resistant serial martensitic stamped steels. Research methods. Metallographic, durometric, tensile and impact strength tests at room and high temperatures.. Results. The peculiarities of dispersion hardening and microstructures of the investigated high-nitrogen austenitic chromium-manganese steels alloyed with vanadium and molybdenum were determined. The mechanical properties of the selected steels were determined depending on the content of strengthening alloying elements. Significant advantages in the high-temperature (750 and 850 °C) strength of high-nitrogen austenitic chromium-manganese steels alloyed with vanadium and molybdenum were found compared to the serial high-temperature stamping steel 5Х3В3МФС (ДИ23). The highest hardness and strength values correspond to the research steel 60Х11Г16АФ2М2, which allows us to recommend it as an effective substitute for die steels when required to provide increased resistance to high-temperature dehardening of hot-die tools. Scientific novelty. An abnormal presence of a minimum on the dispersion hardening curves of high-nitrogen austenitic chromium-manganese steels with molybdenum and its shift towards a shorter aging duration with increasing aging temperature have been determined. The formation of large particles of primary excess phases with increasing vanadium and molybdenum content in steels was revealed. The dependence of strength and ductility characteristics on the total alloying of the studied austenitic chromium-manganese steels with nitrogen and carbon was established. Practical value. The effectiveness of molybdenum alloying along with vanadium in high-nitrogen austenitic chromium-manganese steels has been established to provide significant (1.5...2.5 times) advantages in high-temperature strength compared to heat-resistant commerciall stamped steels.. The research steel 60Х11Г16АФ2М2 may be the most promising substitute for die steels under high force loads at operating temperatures of 750 °C and above.","PeriodicalId":489209,"journal":{"name":"Novì materìali ì tehnologìï v metalurgìï ta mašinobuduvannì","volume":"107 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-10-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135149361","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2023-10-08DOI: 10.15588/1607-6885-2023-3-2
O. Shorinov, A. Dolmatov, K. Balushok, S. Polyviany
Purpose. To develop a mathematical model for describing the dependence of the microhardness of ASD-1 aluminum powder coatings on the three main factors of the cold gas-dynamic spraying process using statistical methods of experiment planning.
Research methods. Methods of statistical planning of multifactorial experiments and regression analysis were used to conduct experimental research. The analysis of microhardness was performed according to the standard methodology given in GOST 9450-76. Preparation of transverse microsections for microhardness studies was carried out according to standard methods for preparing samples for metallographic analysis of microstructure. The specialized computer program Stat-Ease 360 was used to process statistical data.
Results. The complex effect of cold gas spraying process parameters on the microhardness of ASD-1 powder coatings in a wide range of values was investigated. According to the results of experimental studies, it was established that in the investigated ranges of the deposition modes, it is possible to obtain microhardness of coatings in range from 49 to 66 HV0.15. The dispertion analysis results showed that the gas temperature and the stand-off distance have the greatest effect on the microhardness of the coatings, while the powder feed rate has no significant effect on the microhardness. The obtained regression equation can be used to predict the microhardness of coatings from the ASD-1 powder, and the error between the calculated and actual values does not exceed 5%.
Scientific novelty. Empirical dependences of the microhardness of ASD-1 powder coatings, deposited by cold spraying, on the gas temperature at the nozzle inlet, stand-off distance, and powder feed rate in the specified ranges of values were obtained.
Practical value. The obtained dependences of the coating microhardness on the process parameters can be used to select modes of cold spraying of protective and restorative coatings, in particular on aircraft engine parts.
{"title":"PREDICTION OF MICROHARDNESS OF ASD-1 POWDER COLD SPRAYING COATINGS","authors":"O. Shorinov, A. Dolmatov, K. Balushok, S. Polyviany","doi":"10.15588/1607-6885-2023-3-2","DOIUrl":"https://doi.org/10.15588/1607-6885-2023-3-2","url":null,"abstract":"Purpose. To develop a mathematical model for describing the dependence of the microhardness of ASD-1 aluminum powder coatings on the three main factors of the cold gas-dynamic spraying process using statistical methods of experiment planning.
 Research methods. Methods of statistical planning of multifactorial experiments and regression analysis were used to conduct experimental research. The analysis of microhardness was performed according to the standard methodology given in GOST 9450-76. Preparation of transverse microsections for microhardness studies was carried out according to standard methods for preparing samples for metallographic analysis of microstructure. The specialized computer program Stat-Ease 360 was used to process statistical data.
 Results. The complex effect of cold gas spraying process parameters on the microhardness of ASD-1 powder coatings in a wide range of values was investigated. According to the results of experimental studies, it was established that in the investigated ranges of the deposition modes, it is possible to obtain microhardness of coatings in range from 49 to 66 HV0.15. The dispertion analysis results showed that the gas temperature and the stand-off distance have the greatest effect on the microhardness of the coatings, while the powder feed rate has no significant effect on the microhardness. The obtained regression equation can be used to predict the microhardness of coatings from the ASD-1 powder, and the error between the calculated and actual values does not exceed 5%.
 Scientific novelty. Empirical dependences of the microhardness of ASD-1 powder coatings, deposited by cold spraying, on the gas temperature at the nozzle inlet, stand-off distance, and powder feed rate in the specified ranges of values were obtained.
 Practical value. The obtained dependences of the coating microhardness on the process parameters can be used to select modes of cold spraying of protective and restorative coatings, in particular on aircraft engine parts.","PeriodicalId":489209,"journal":{"name":"Novì materìali ì tehnologìï v metalurgìï ta mašinobuduvannì","volume":"52 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-10-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135253008","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
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