{"created":"2025-06-12T00:40:43.318371+00:00","id":2000343,"links":{},"metadata":{"_buckets":{"deposit":"feb7210d-bcc2-4e43-a38d-fd823aa88841"},"_deposit":{"created_by":20,"id":"2000343","owner":"20","owners":[20],"pid":{"revision_id":0,"type":"depid","value":"2000343"},"status":"published"},"_oai":{"id":"oai:muroran-it.repo.nii.ac.jp:02000343","sets":["41:227"]},"author_link":[],"item_1716854901627":{"attribute_name":"日付","attribute_value_mlt":[{"subitem_date_issued_datetime":"2027-04-01","subitem_date_issued_type":"Available"}]},"item_81_date_granted_17":{"attribute_name":"学位授与年月日","attribute_value_mlt":[{"subitem_dategranted":"2025-03-24"}]},"item_81_degree_grantor_10":{"attribute_name":"学位授与機関","attribute_value_mlt":[{"subitem_degreegrantor":[{"subitem_degreegrantor_language":"ja","subitem_degreegrantor_name":"室蘭工業大学"},{"subitem_degreegrantor_language":"en","subitem_degreegrantor_name":"Muroran Institute of Technology"}],"subitem_degreegrantor_identifier":[{"subitem_degreegrantor_identifier_name":"10103","subitem_degreegrantor_identifier_scheme":"kakenhi"}]}]},"item_81_degree_name_11":{"attribute_name":"学位名","attribute_value_mlt":[{"subitem_degreename":"博士（工学）","subitem_degreename_language":"ja"}]},"item_81_description_7":{"attribute_name":"抄録","attribute_value_mlt":[{"subitem_description":"本研究では，ASTM G 65 に準拠したラバーホイール摩耗試験において，高クロム鋳鉄（HCCI）\nのアブレシブ摩耗特性に及ぼす炭素（C）とチタン（Ti）の影響を調査した．C とTi を系統\n的に添加することにより，HCCI の耐摩耗性と硬度を調査し，まざまなクロム（Cr）含有量\nの多合金白鋳鉄（MWCI）と比較した．その結果，C を多く含みTi を含まないHCCI(4C-0Ti)\nは，より大きく硬いM7C3 炭化物を有し，硬度の増加により室温での耐摩耗性が向上すること\nが明らかになった．しかし，Ti を添加するとTiC が晶出し，M7C3 炭化物が微細化するため，\n硬度が低下し，室温での耐摩耗性が低下した．さらに，C 値が高くなると，硬度は高くなる\nが耐摩耗性は低下する．\n一方，高温環境下では，硬度の低い試料（3C-2Ti）が優れた耐高温アブレシブ摩耗性を示\nした．これは，C 値が低く，Ti 値が高い試料に見られる炭化物の微細化が，耐摩耗性の向上\nに重要な役割を果たしていることを示唆している．\nさらに，この研究では，HCCI に遷移金属（バナジウム，モリブデン，タングステンなど）\nを添加した場合の摩耗挙動を調査している．Cr リッチなMWCI 組成（18CrMWCI、27CrMWCI、\n35CrMWCI）の摩耗特性を調査した結果，27CrMWCI はM7C3 およびM2C 炭化物析出による高い\n炭化物体積分率（CVF）を示し，最も高い硬度となることから，最も優れた耐摩耗性を示す\nことが明らかとなった．他の供試材に比べ，35CrMWCI のCVF は低いが，耐酸化性に優れる\nため，耐高温摩耗特性向上に寄与した．\nこのように，HCCI の耐高温摩耗特性の向上には，炭化物の微細化と戦略的な合金化の両\n方が重要である．","subitem_description_language":"ja","subitem_description_type":"Abstract"},{"subitem_description":"This study explores the effect of carbon (C) and titanium (Ti) on the abrasive\nwear characteristics of high chromium cast irons (HCCI) in three-body wear tests.\nBy adding different levels of C and Ti, the wear resistance and hardness of HCCI\nsamples were tested and compared to multi-component white cast irons (MWCI) with\nvarious chromium (Cr) content. Results reveal that HCCIs with higher C but without\nTi (4C-0Ti) exhibit larger, harder M7C3 carbides, which enhance room-temperature\nwear resistance due to increased hardness. However, adding Ti leads to TiC\nprecipitation, refining M7C3 carbides, which lowers hardness and reduces wear\nresistance at room temperature. Additionally, higher C levels result in higher\nhardness but lower wear resistance.\nAt elevated temperatures, the wear mechanism changes, as the hardness of the\ncarbides does not improve wear resistance; instead, high hardness increases wear.\nThe sample with lower hardness (3C-2Ti) exhibits the strongest high-temperature\nwear resistance. This suggests carbide refinement, seen in specimens with lower C\nand higher Ti, plays a key role in enhancing wear resistance.\nFurther, the study investigates wear behavior by adding transition metals (like\nVanadium, Molybdenum, Tungsten, and Cobalt) to HCCI. Testing on Cr-rich MWCI\ncompositions (18CrMWCI, 27CrMWCI, and 35CrMWCI) finds that 27CrMWCI exhibits the\nbest wear resistance due to a high carbide volume fraction (CVF) and hardness,\nattributed to M7C3 and M2C carbide precipitation. Comparatively, 35CrMWCI has lower\nCVF but better oxidation resistance due to a thinner oxidation layer, contributing\nto its superior high-temperature wear resistance.\nThus, both carbide refinement and strategic alloying are critical in improving\nhigh-temperature wear resistance in HCCI.","subitem_description_language":"en","subitem_description_type":"Abstract"}]},"item_81_dissertation_number_13":{"attribute_name":"学位授与番号","attribute_value_mlt":[{"subitem_dissertationnumber":"甲第547号"}]},"item_81_text_12":{"attribute_name":"学位の種別","attribute_value_mlt":[{"subitem_text_language":"ja","subitem_text_value":"課程博士"}]},"item_81_text_14":{"attribute_name":"報告番号","attribute_value_mlt":[{"subitem_text_language":"ja","subitem_text_value":"博甲第547"}]},"item_81_text_15":{"attribute_name":"学位記番号","attribute_value_mlt":[{"subitem_text_language":"ja","subitem_text_value":"博甲第547号"}]},"item_81_text_16":{"attribute_name":"研究科・専攻","attribute_value_mlt":[{"subitem_text_language":"ja","subitem_text_value":"工学研究科"}]},"item_81_version_type_24":{"attribute_name":"著者版フラグ","attribute_value_mlt":[{"subitem_version_resource":"http://purl.org/coar/version/c_970fb48d4fbd8a85","subitem_version_type":"VoR"}]},"item_access_right":{"attribute_name":"アクセス権","attribute_value_mlt":[{"subitem_access_right":"embargoed access","subitem_access_right_uri":"http://purl.org/coar/access_right/c_f1cf"}]},"item_creator":{"attribute_name":"著者","attribute_type":"creator","attribute_value_mlt":[{"creatorAffiliations":[{"affiliationNames":[{"affiliationName":"室蘭工業大学","affiliationNameLang":"ja"},{"affiliationName":"Muroran Institute of Technology","affiliationNameLang":"en"}]}],"creatorNames":[{"creatorName":"Mohammad, Jobayer Huq","creatorNameLang":"en"}],"familyNames":[{"familyName":"Mohammad","familyNameLang":"en"}],"givenNames":[{"givenName":"Jobayer Huq","givenNameLang":"en"}]}]},"item_files":{"attribute_name":"ファイル情報","attribute_type":"file","attribute_value_mlt":[{"accessrole":"open_date","date":[{"dateType":"Available","dateValue":"2027-04-01"}],"filename":"A547.pdf","filesize":[{"value":"10.4 MB"}],"format":"application/pdf","url":{"objectType":"fulltext","url":"https://muroran-it.repo.nii.ac.jp/record/2000343/files/A547.pdf"},"version_id":"3fee0f99-819b-44e2-ade2-efe7a37f6de1"},{"accessrole":"open_access","date":[{"dateType":"Available","dateValue":"2025-06-12"}],"filename":"A547_summary.pdf","filesize":[{"value":"115 KB"}],"format":"application/pdf","url":{"objectType":"abstract","url":"https://muroran-it.repo.nii.ac.jp/record/2000343/files/A547_summary.pdf"},"version_id":"49318a75-97d3-4397-99de-c4f54a5f2036"}]},"item_language":{"attribute_name":"言語","attribute_value_mlt":[{"subitem_language":"eng"}]},"item_resource_type":{"attribute_name":"資源タイプ","attribute_value_mlt":[{"resourcetype":"doctoral thesis","resourceuri":"http://purl.org/coar/resource_type/c_db06"}]},"item_title":"Abrasive and erosive wear characteristics of high chromium based multicomponent white cast irons at room and elevated temperature","item_titles":{"attribute_name":"タイトル","attribute_value_mlt":[{"subitem_title":"Abrasive and erosive wear characteristics of high chromium based multicomponent white cast irons at room and elevated temperature","subitem_title_language":"en"},{"subitem_title":"室温および高温環境下における高クロム系多合金白色鋳鉄のエロー ジョンおよびアブレシブ摩耗特性","subitem_title_language":"ja"}]},"item_type_id":"81","owner":"20","path":["227"],"pubdate":{"attribute_name":"PubDate","attribute_value":"2025-06-12"},"publish_date":"2025-06-12","publish_status":"0","recid":"2000343","relation_version_is_last":true,"title":["Abrasive and erosive wear characteristics of high chromium based multicomponent white cast irons at room and elevated temperature"],"weko_creator_id":"20","weko_shared_id":-1},"updated":"2025-06-12T00:46:12.908191+00:00"}