Article(id=1309884500767769201, tenantId=1146029695717560320, journalId=1189873562199433220, issueId=1309884491208945711, articleNumber=null, orderNo=null, doi=10.19710/J.cnki.1003-8817.20260053, pmid=null, cstr=null, oa=null, hot=null, price=null, onlineType=0, articleFormat=0, articleType=null, articleTypeStr=null, receivedDate=null, receivedDateStr=null, revisedDate=null, revisedDateStr=null, acceptedDate=null, acceptedDateStr=null, onlineDate=1790230401459, onlineDateStr=2026-09-24, pubDate=1789833600000, pubDateStr=2026-09-20, doiRegisterDate=null, doiRegisterDateStr=null, onlineIssueDate=1790230401459, onlineIssueDateStr=2026-09-24, onlineJustAcceptDate=null, onlineJustAcceptDateStr=null, onlineFirstDate=null, onlineFirstDateStr=null, sourceXml=null, magXml=null, createTime=1790230401459, creator=13701087609, updateTime=1790230401459, updator=13701087609, issue=Issue{id=1309884491208945711, tenantId=1146029695717560320, journalId=1189873562199433220, year='2026', volume='', issue='9', pageStart='1', pageEnd='72', issueExtLink='null', onlineDate='null', pubDate='1789833600000', pubDateStr='2026-09-20', beforeIssueId=null, nextIssueId=null, price=null, status=1, issueComplete=1, articleOrder=1, issueType=-1, specialIssue=null, createTime=1790230399181, creator='13701087609', updateTime=1790231045823, updator='13701087609', preIssue=null, nextIssue=null, articleTotal=null, ext={EN=IssueExt(id=1309887203875061804, tenantId=1146029695717560320, journalId=1189873562199433220, issueId=1309884491208945711, language=EN, specialIssueTitle=, coverIllustrator=null, specialIssueEditor=, specialIssueAbout=), CN=IssueExt(id=1309887203875061805, tenantId=1146029695717560320, journalId=1189873562199433220, issueId=1309884491208945711, language=CN, specialIssueTitle=, coverIllustrator=null, specialIssueEditor=, specialIssueAbout=)}, issueFiles=null, downloadFileDto=null}, startPage=19, endPage=24, ext={EN=ArticleExt(id=1309884501115896434, articleId=1309884500767769201, tenantId=1146029695717560320, journalId=1189873562199433220, language=EN, title=Cracking Failure Analysis of Transmission Sleeve, columnId=null, journalTitle=Automobile Technology & Material, columnName=null, runingTitle=null, highlight=null, articleAbstract=

To address the premature cracking of a certain type of transmission sleeve, a comprehensive failure analysis was performed using methods including chemical composition analysis, hardness testing, case-hardening depth measurement, metallographic examination and microscopic fractography. The results indicate that the failure was primarily caused by two synergistic factors. Firstly, excessive blocky ferrite in the core microstructure led to insufficient core hardness, resulting in poor hardness compatibility with the connected main shaft and sun gear. Secondly, the actual fillet radius at the root of the internal spline was below the design lower limit, which aggravated the local stress concentration effect. Under cyclic loading, the combined action of these two effects initiated and propagated cracks at the fillet of the internal spline tooth root, leading to the final failure. Based on these findings, corresponding improvement measures are proposed from the aspects of optimizing the material heat treatment process and controlling critical structural dimensions.

, authors=Xinxin Hao, Guanfang Chen, Tongsheng Ji, Chao Xiao, Wei Ji, authorsList=Xinxin Hao, Guanfang Chen, Tongsheng Ji, Chao Xiao, Wei Ji, authorCompany=null, correspAuthors=null, authorNote=null, correspAuthorsNote=null, copyrightStatement=null, copyrightOwner=null, extLink=null, articleAbsUrl=null, sourceXml=null, magXml=null, pdfUrl=null, pdf=null, pdfFileSize=null, pdfExtLink=null, richHtmlUrl=null, mobilePdfUrl=null, reviewReport=null, pdfFirstPage=null, abstractGraph=null, abstractGraphContent=null, abstractVideo=null, citation=null, cebUrl=null, magXmlContent=null, mapNumber=null, fund=null), CN=ArticleExt(id=1309884501472412275, articleId=1309884500767769201, tenantId=1146029695717560320, journalId=1189873562199433220, language=CN, title=变速器过渡套开裂失效分析, columnId=1309884492207190065, journalTitle=汽车工艺与材料, columnName=汽车零部件失效分析技术专题, runingTitle=null, highlight=null, articleAbstract=

针对某型号变速器过渡套的早期开裂问题，采用化学成分分析、硬度检验、硬化层深度测定、金相组织与断口微观形貌分析等方法对过渡套进行了失效分析。结果表明，失效主要由两方面因素导致：其一，零件心部组织中存在大量块状铁素体，致使其心部硬度偏低、与相连接的主轴及太阳轮的硬度匹配性较差；其二，内花键齿根处的实际圆角半径低于设计下限，导致该区域应力集中效应加剧。在交变载荷作用下，两效应叠加，最终于内花键齿根圆角处发生开裂失效。据此，从材料热处理工艺优化和关键结构尺寸控制两方面提出了改进措施。

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郝欣欣（1996—），女，工程师，硕士学位，研究方向为金属材料开发应用与失效分析。

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郝欣欣（1996—），女，工程师，硕士学位，研究方向为金属材料开发应用与失效分析。

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