{"_buckets": {"deposit": "5c0af754-7123-4e2e-8907-9b0091f63b40"}, "_deposit": {"id": "18001", "owners": [], "pid": {"revision_id": 0, "type": "depid", "value": "18001"}, "status": "published"}, "_oai": {"id": "oai:soar-ir.repo.nii.ac.jp:00018001", "sets": ["1221:1222"]}, "item_6_biblio_info_6": {"attribute_name": "\u66f8\u8a8c\u60c5\u5831", "attribute_value_mlt": [{"bibliographicIssueDates": {"bibliographicIssueDate": "2014-06-05", "bibliographicIssueDateType": "Issued"}, "bibliographicIssueNumber": "4", "bibliographicPageEnd": "962", "bibliographicPageStart": "955", "bibliographicVolumeNumber": "54", "bibliographic_titles": [{"bibliographic_title": "ISIJ INTERNATIONAL"}]}]}, "item_6_description_20": {"attribute_name": "\u6284\u9332", "attribute_value_mlt": [{"subitem_description": "The fracture toughness of an advanced ultrahigh-strength 0.2%C-1.5%Si-1.5%Mn-1.0%Cr-0.05%Nb (in mass%) transformation-induced plasticity (TRIP)-aided steel with a bainitic ferrite and/or martensite structure matrix was investigated for applications in automobiles, construction machines, and pressure vessels. After the steel was austenitized and isothermally transformed via heat treatment at temperatures between 200 degrees C and 350 degrees C below the martensite-finish temperature, it exhibited a good combination of tensile strength (1.4 GPa) and total elongation (15%). In addition, the steel achieved a much higher plane-strain fracture toughness (K-IC = 129-154 MPa m(1/2)) than conventional structural steel such as SCM420 steel (K-IC = 57-63 MPa m(1/2)). Surprisingly, the fracture toughness was nearly the same as that of a maraging steel. Our results indicate that the high fracture toughness was associated with (1) a softened wide lath-martensite matrix with a low carbide content and carbon concentration and (2) effective plastic relaxation of localized stress concentration by the strain-induced transformation of fine metastable retained austenite in the narrow lath-martensite and retained austenite mixture, which suppresses void formation and cleavage crack initiation at the pre-crack tip.", "subitem_description_type": "Abstract"}]}, "item_6_description_30": {"attribute_name": "\u8cc7\u6e90\u30bf\u30a4\u30d7\uff08\u30b3\u30f3\u30c6\u30f3\u30c4\u306e\u7a2e\u985e\uff09", "attribute_value_mlt": [{"subitem_description": "Article", "subitem_description_type": "Other"}]}, "item_6_description_5": {"attribute_name": "\u5f15\u7528", "attribute_value_mlt": [{"subitem_description": "ISIJ INTERNATIONAL. 54(4):955-962 (2014)", "subitem_description_type": "Other"}]}, "item_6_link_3": {"attribute_name": "\u4fe1\u5dde\u5927\u5b66\u7814\u7a76\u8005\u7dcf\u89a7\u3078\u306e\u30ea\u30f3\u30af", "attribute_value_mlt": [{"subitem_link_text": "Sugimoto, Koh-ichi", "subitem_link_url": "http://soar-rd.shinshu-u.ac.jp/profile/ja.jCApjekV.html"}]}, "item_6_link_67": {"attribute_name": "WoS", "attribute_value_mlt": [{"subitem_link_text": "Web of Science", "subitem_link_url": "http://gateway.isiknowledge.com/gateway/Gateway.cgi?\u0026GWVersion=2\u0026SrcAuth=ShinshuUniv\u0026SrcApp=ShinshuUniv\u0026DestLinkType=FullRecord\u0026DestApp=WOS\u0026KeyUT=000334824200032"}]}, "item_6_publisher_4": {"attribute_name": "\u51fa\u7248\u8005", "attribute_value_mlt": [{"subitem_publisher": "IRON STEEL INST JAPAN KEIDANREN KAIKAN"}]}, "item_6_relation_48": {"attribute_name": "DOI", "attribute_value_mlt": [{"subitem_relation_name": [{"subitem_relation_name_text": "10.2355/isijinternational.54.955"}], "subitem_relation_type_id": {"subitem_relation_type_id_text": "http://dx.doi.org/10.2355/isijinternational.54.955", "subitem_relation_type_select": "DOI"}}]}, "item_6_rights_62": {"attribute_name": "\u6a29\u5229", "attribute_value_mlt": [{"subitem_rights": "Copyright \u00a9 2014 ISIJ"}]}, "item_6_select_64": {"attribute_name": "\u8457\u8005\u7248\u30d5\u30e9\u30b0", "attribute_value_mlt": [{"subitem_select_item": "publisher"}]}, "item_6_source_id_35": {"attribute_name": "ISSN", "attribute_value_mlt": [{"subitem_source_identifier": "0915-1559", "subitem_source_identifier_type": "ISSN"}]}, "item_6_source_id_39": {"attribute_name": "NII ISSN", "attribute_value_mlt": [{"subitem_source_identifier": "0915-1559", "subitem_source_identifier_type": "ISSN"}]}, "item_6_source_id_40": {"attribute_name": "\u66f8\u8a8c\u30ec\u30b3\u30fc\u30c9ID", "attribute_value_mlt": [{"subitem_source_identifier": "AA10680712", "subitem_source_identifier_type": "NCID"}]}, "item_6_text_69": {"attribute_name": "wosonly authkey", "attribute_value_mlt": [{"subitem_text_value": "fracture toughness; ultrahigh-strength steel; TRIP-aided steel; microstructure; retained austenite; martensite; bainitic ferrite"}]}, "item_6_text_70": {"attribute_name": "wosonly keywords", "attribute_value_mlt": [{"subitem_text_value": "TEMPERED MARTENSITE EMBRITTLEMENT; BAINITIC FERRITE; MARAGING-STEEL; CARBON-STEELS; SHEET STEELS; AUSTENITE; MATRIX; TRANSFORMATION"}]}, "item_6_textarea_68": {"attribute_name": "wosonly abstract", "attribute_value_mlt": [{"subitem_textarea_value": "The fracture toughness of an advanced ultrahigh-strength 0.2%C-1.5%Si-1.5%Mn-1.0%Cr-0.05%Nb (in mass%) transformation-induced plasticity (TRIP)-aided steel with a bainitic ferrite and/or martensite structure matrix was investigated for applications in automobiles, construction machines, and pressure vessels. After the steel was austenitized and isothermally transformed via heat treatment at temperatures between 200 degrees C and 350 degrees C below the martensite-finish temperature, it exhibited a good combination of tensile strength (1.4 GPa) and total elongation (15%). In addition, the steel achieved a much higher plane-strain fracture toughness (K-IC = 129-154 MPa m(1/2)) than conventional structural steel such as SCM420 steel (K-IC = 57-63 MPa m(1/2)). Surprisingly, the fracture toughness was nearly the same as that of a maraging steel. Our results indicate that the high fracture toughness was associated with (1) a softened wide lath-martensite matrix with a low carbide content and carbon concentration and (2) effective plastic relaxation of localized stress concentration by the strain-induced transformation of fine metastable retained austenite in the narrow lath-martensite and retained austenite mixture, which suppresses void formation and cleavage crack initiation at the pre-crack tip."}]}, "item_creator": {"attribute_name": "\u8457\u8005", "attribute_type": "creator", "attribute_value_mlt": [{"creatorNames": [{"creatorName": "Kobayashi,  Junya"}], "nameIdentifiers": [{"nameIdentifier": "50308", "nameIdentifierScheme": "WEKO"}]}, {"creatorNames": [{"creatorName": "Ina,  Daiki"}], "nameIdentifiers": [{"nameIdentifier": "50309", "nameIdentifierScheme": "WEKO"}]}, {"creatorNames": [{"creatorName": "Futamura,  Asahiko"}], "nameIdentifiers": [{"nameIdentifier": "50310", "nameIdentifierScheme": "WEKO"}]}, {"creatorNames": [{"creatorName": "Sugimoto,  Koh-ichi"}], "nameIdentifiers": [{"nameIdentifier": "50311", "nameIdentifierScheme": "WEKO"}]}]}, "item_files": {"attribute_name": "\u30d5\u30a1\u30a4\u30eb\u60c5\u5831", "attribute_type": "file", "attribute_value_mlt": [{"accessrole": "open_date", "date": [{"dateType": "Available", "dateValue": "2016-04-21"}], "displaytype": "detail", "download_preview_message": "", "file_order": 0, "filename": "Fracture_Toughness_Advanced_Ultrahigh-strength.pdf", "filesize": [{"value": "2.8 MB"}], "format": "application/pdf", "future_date_message": "", "is_thumbnail": false, "licensetype": "license_free", "mimetype": "application/pdf", "size": 2800000.0, "url": {"label": "Fracture_Toughness_Advanced_Ultrahigh-strength.pdf", "url": "https://soar-ir.repo.nii.ac.jp/record/18001/files/Fracture_Toughness_Advanced_Ultrahigh-strength.pdf"}, "version_id": "1b009064-9057-45d7-b2da-78435ca030d3"}]}, "item_keyword": {"attribute_name": "\u30ad\u30fc\u30ef\u30fc\u30c9", "attribute_value_mlt": [{"subitem_subject": "fracture toughness", "subitem_subject_scheme": "Other"}, {"subitem_subject": "ultrahigh-strength steel", "subitem_subject_scheme": "Other"}, {"subitem_subject": "TRIP-aided steel", "subitem_subject_scheme": "Other"}, {"subitem_subject": "microstructure", "subitem_subject_scheme": "Other"}, {"subitem_subject": "retained austenite", "subitem_subject_scheme": "Other"}, {"subitem_subject": "martensite", "subitem_subject_scheme": "Other"}, {"subitem_subject": "bainitic ferrite", "subitem_subject_scheme": "Other"}]}, "item_language": {"attribute_name": "\u8a00\u8a9e", "attribute_value_mlt": [{"subitem_language": "eng"}]}, "item_resource_type": {"attribute_name": "\u8cc7\u6e90\u30bf\u30a4\u30d7", "attribute_value_mlt": [{"resourcetype": "journal article", "resourceuri": "http://purl.org/coar/resource_type/c_6501"}]}, "item_title": "Fracture Toughness of an Advanced Ultrahigh-strength TRIP-aided Steel", "item_titles": {"attribute_name": "\u30bf\u30a4\u30c8\u30eb", "attribute_value_mlt": [{"subitem_title": "Fracture Toughness of an Advanced Ultrahigh-strength TRIP-aided Steel"}]}, "item_type_id": "6", "owner": "1", "path": ["1221/1222"], "permalink_uri": "http://hdl.handle.net/10091/00018769", "pubdate": {"attribute_name": "\u516c\u958b\u65e5", "attribute_value": "2016-04-21"}, "publish_date": "2016-04-21", "publish_status": "0", "recid": "18001", "relation": {}, "relation_version_is_last": true, "title": ["Fracture Toughness of an Advanced Ultrahigh-strength TRIP-aided Steel"], "weko_shared_id": null}