{"title":"GG20-GCI 制动鼓：Mn/S 对机械加工性能和拉伸行为的影响","authors":"Hanie Ghanbari, Mostafa Ketabchi, Esmaeil Damavandi","doi":"10.1007/s40962-024-01355-z","DOIUrl":null,"url":null,"abstract":"<p>This study aims to assess the influence of the Mn to S ratios on the machinability and tensile behavior of GG20-gray cast iron brake drums. The effect of various Mn and S contents on microstructural characteristics such as type, size, and aspect ratio of graphite particles, interlamellar spacing of pearlite, and the distribution factor, size, and volume fraction of MnS were investigated. The microstructural results showed that a decrease in the Mn/S ratio to 5.1 and a decrease in the Ti/S ratio to under 0.11 promote the lengthy A-type graphite formation. Meanwhile, with the %Mn × %S value of about 0.08, the best uniform distribution of MnS inclusions has been obtained (about 55% of MnS inclusions are near A-type graphite flakes in the P1 specimen with %Mn × %S about 0.08 and Mn/S value of 5.1). Good machining in terms of less wear of the cutting tool and easier fragmentation of the chip in the sample with Mn/S value of 1.5 (0.65% Mn and 0.128% Sulfur) due to having more MnS inclusions, as well as a larger grain size graphite and its high aspect ratio have been obtained. The minimum tensile strength has been calculated to be 193MPa in the specimen with Mn/S value of 3.5 (0.55% manganese and 0.156% sulfur) due to the effects of higher sulfur content on changing the morphology of graphite to a higher aspect ratio. Meanwhile, at the same content of Mn (almost 0.55 wt%), further reduction of sulfur results in promoting E and D types of graphite in the microstructure.</p><h3 data-test=\"abstract-sub-heading\">Graphic Abstract</h3>","PeriodicalId":14231,"journal":{"name":"International Journal of Metalcasting","volume":null,"pages":null},"PeriodicalIF":2.6000,"publicationDate":"2024-05-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":"{\"title\":\"GG20-GCI Brake Drum: The Effect of Mn/S on Machinability and Tensile Behavior\",\"authors\":\"Hanie Ghanbari, Mostafa Ketabchi, Esmaeil Damavandi\",\"doi\":\"10.1007/s40962-024-01355-z\",\"DOIUrl\":null,\"url\":null,\"abstract\":\"<p>This study aims to assess the influence of the Mn to S ratios on the machinability and tensile behavior of GG20-gray cast iron brake drums. The effect of various Mn and S contents on microstructural characteristics such as type, size, and aspect ratio of graphite particles, interlamellar spacing of pearlite, and the distribution factor, size, and volume fraction of MnS were investigated. The microstructural results showed that a decrease in the Mn/S ratio to 5.1 and a decrease in the Ti/S ratio to under 0.11 promote the lengthy A-type graphite formation. Meanwhile, with the %Mn × %S value of about 0.08, the best uniform distribution of MnS inclusions has been obtained (about 55% of MnS inclusions are near A-type graphite flakes in the P1 specimen with %Mn × %S about 0.08 and Mn/S value of 5.1). Good machining in terms of less wear of the cutting tool and easier fragmentation of the chip in the sample with Mn/S value of 1.5 (0.65% Mn and 0.128% Sulfur) due to having more MnS inclusions, as well as a larger grain size graphite and its high aspect ratio have been obtained. The minimum tensile strength has been calculated to be 193MPa in the specimen with Mn/S value of 3.5 (0.55% manganese and 0.156% sulfur) due to the effects of higher sulfur content on changing the morphology of graphite to a higher aspect ratio. Meanwhile, at the same content of Mn (almost 0.55 wt%), further reduction of sulfur results in promoting E and D types of graphite in the microstructure.</p><h3 data-test=\\\"abstract-sub-heading\\\">Graphic Abstract</h3>\",\"PeriodicalId\":14231,\"journal\":{\"name\":\"International Journal of Metalcasting\",\"volume\":null,\"pages\":null},\"PeriodicalIF\":2.6000,\"publicationDate\":\"2024-05-09\",\"publicationTypes\":\"Journal Article\",\"fieldsOfStudy\":null,\"isOpenAccess\":false,\"openAccessPdf\":\"\",\"citationCount\":\"0\",\"resultStr\":null,\"platform\":\"Semanticscholar\",\"paperid\":null,\"PeriodicalName\":\"International Journal of Metalcasting\",\"FirstCategoryId\":\"88\",\"ListUrlMain\":\"https://doi.org/10.1007/s40962-024-01355-z\",\"RegionNum\":3,\"RegionCategory\":\"材料科学\",\"ArticlePicture\":[],\"TitleCN\":null,\"AbstractTextCN\":null,\"PMCID\":null,\"EPubDate\":\"\",\"PubModel\":\"\",\"JCR\":\"Q2\",\"JCRName\":\"METALLURGY & METALLURGICAL ENGINEERING\",\"Score\":null,\"Total\":0}","platform":"Semanticscholar","paperid":null,"PeriodicalName":"International Journal of Metalcasting","FirstCategoryId":"88","ListUrlMain":"https://doi.org/10.1007/s40962-024-01355-z","RegionNum":3,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q2","JCRName":"METALLURGY & METALLURGICAL ENGINEERING","Score":null,"Total":0}
GG20-GCI Brake Drum: The Effect of Mn/S on Machinability and Tensile Behavior
This study aims to assess the influence of the Mn to S ratios on the machinability and tensile behavior of GG20-gray cast iron brake drums. The effect of various Mn and S contents on microstructural characteristics such as type, size, and aspect ratio of graphite particles, interlamellar spacing of pearlite, and the distribution factor, size, and volume fraction of MnS were investigated. The microstructural results showed that a decrease in the Mn/S ratio to 5.1 and a decrease in the Ti/S ratio to under 0.11 promote the lengthy A-type graphite formation. Meanwhile, with the %Mn × %S value of about 0.08, the best uniform distribution of MnS inclusions has been obtained (about 55% of MnS inclusions are near A-type graphite flakes in the P1 specimen with %Mn × %S about 0.08 and Mn/S value of 5.1). Good machining in terms of less wear of the cutting tool and easier fragmentation of the chip in the sample with Mn/S value of 1.5 (0.65% Mn and 0.128% Sulfur) due to having more MnS inclusions, as well as a larger grain size graphite and its high aspect ratio have been obtained. The minimum tensile strength has been calculated to be 193MPa in the specimen with Mn/S value of 3.5 (0.55% manganese and 0.156% sulfur) due to the effects of higher sulfur content on changing the morphology of graphite to a higher aspect ratio. Meanwhile, at the same content of Mn (almost 0.55 wt%), further reduction of sulfur results in promoting E and D types of graphite in the microstructure.
期刊介绍：
The International Journal of Metalcasting is dedicated to leading the transfer of research and technology for the global metalcasting industry. The quarterly publication keeps the latest developments in metalcasting research and technology in front of the scientific leaders in our global industry throughout the year. All papers published in the the journal are approved after a rigorous peer review process. The editorial peer review board represents three international metalcasting groups: academia (metalcasting professors), science and research (personnel from national labs, research and scientific institutions), and industry (leading technical personnel from metalcasting facilities).
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