Article(id=1188430996664889769, tenantId=1146029695717560320, journalId=1185652524569653253, issueId=1188430994622268045, articleNumber=1009-5438(2024)04-0085-04, orderNo=null, doi=null, pmid=null, cstr=null, oa=null, hot=null, price=null, onlineType=0, articleFormat=0, articleType=null, articleTypeStr=null, receivedDate=1717171200000, receivedDateStr=2024-06-01, revisedDate=null, revisedDateStr=null, acceptedDate=null, acceptedDateStr=null, onlineDate=1761273629585, onlineDateStr=2025-10-24, pubDate=1724515200000, pubDateStr=2024-08-25, doiRegisterDate=null, doiRegisterDateStr=null, onlineIssueDate=1761273629585, onlineIssueDateStr=2025-10-24, onlineJustAcceptDate=null, onlineJustAcceptDateStr=null, onlineFirstDate=null, onlineFirstDateStr=null, sourceXml=null, magXml=null, createTime=1761273629585, creator=13701087609, updateTime=1761273629585, updator=13701087609, issue=Issue{id=1188430994622268045, tenantId=1146029695717560320, journalId=1185652524569653253, year='2024', volume='50', issue='4', pageStart='1', pageEnd='98', issueExtLink='null', onlineDate='null', pubDate='null', beforeIssueId=null, nextIssueId=null, price=null, status=1, issueComplete=0, articleOrder=1, issueType=-1, specialIssue=null, createTime=1761273629097, creator=13701087609, updateTime=1761283356674, updator=13701087609, preIssue=null, nextIssue=null, ext={EN=IssueExt(id=1188471795062555053, tenantId=1146029695717560320, journalId=1185652524569653253, issueId=1188430994622268045, language=EN, specialIssueTitle=, coverIllustrator=null, specialIssueEditor=, specialIssueAbout=), CN=IssueExt(id=1188471795062555054, tenantId=1146029695717560320, journalId=1185652524569653253, issueId=1188430994622268045, language=CN, specialIssueTitle=, coverIllustrator=null, specialIssueEditor=, specialIssueAbout=)}, issueFiles=null}, startPage=85, endPage=88, ext={EN=ArticleExt(id=1188430996857827757, articleId=1188430996664889769, tenantId=1146029695717560320, journalId=1185652524569653253, language=EN, title=Cause Analysis on Fluctuation of Impact Energy for Q690 Steel Plate with Large Thickness, columnId=null, journalTitle=Science & Technology of Baotou Steel, columnName=null, runingTitle=null, highlight=null, articleAbstract=
In this paper, the fluctuation of impact energy for Q690 steel plate with large thickness of 80 mm are analyzed. The low temperature impact tests of samples taken from different positions of plate thickness are carried out as well as their fracture and microstructure are compared and analyzed with scanning electron microscopy and metallographic microscope. The differences of impact energy at different positions of plate thickness are great, which are 14.9 J in the center, 27.2 J at the quarter part and 95.4 J near the surface. The corresponding microstructures are coarse tempered bainite and a small amount of tempered sorbite structure with orientation of martensite in the center, tempered sorbite and bainite structures with orientation of martensite at the quarter part as well as fine tempered sorbite structure with orientation of martensite near the surface. The analysis results showed that the main cause for fluctuation of impact energy was the differences of microstructure and grain size. The experiment showed that the higher the proportion of bainite in microstructure, the larger the grain size and the lower the corresponding impact energy. Based on the CCT(continuous cooling transformation) curves of Q690 steel, it is analyzed and judged that insufficient cooling during quenching process causes insufficient cooling speed from the quarter part to the center of steel plate due to the larger thickness specification of Q690 steel plate so that the whole martensitic structure could not be obtained after quenching, microstructure in the direction of plate thickness is uneven, especially different proportions of bainite structure appear at the quarter part and in the center of plate thickness, which cause the fluctuation of impact energy. The uniformity of microstructure for Q690 steel plate with large thickness specification is improved so that the impact energy and its stability are improved by optimizing on-site quenching and tempering process.
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文章针对80 mm大厚度规格Q690钢板冲击功波动情况进行了分析,在实验室开展了钢板厚度不同位置试样的低温冲击试验,并利用扫描电镜和金相显微镜对钢板厚度不同位置冲击试验的断口及显微组织进行了对比分析。钢板厚度不同位置的冲击功差异较大,从心部的14.9 J,到四分之一部位的27.2 J再到近表面的95.4 J,对应的显微组织心部为粗大的回火贝氏体加少量具有马氏体位向的回火索氏体组织,四分之一部位为具有马氏体位向的回火索氏体加回火贝氏体组织,近表面部位为细小的具有马氏体位向的回火索氏体组织。分析结果表明,冲击功波动的主要原因是显微组织和晶粒度的差异,试验表明显微组织中的贝氏体比例越高、晶粒越大则对应的冲击功越低。结合Q690钢的CCT曲线,分析判断由于Q690钢板厚度规格较大,在淬火过程中的冷却不充分导致钢板的四分之一部位至心部的冷却速度不够,淬火后不能获得全部的马氏体组织,板厚度方向的显微组织不均匀,特别是在板厚的四分之一部位和心部出现不同比例的贝氏体组织,因此导致冲击功波动。通过优化现场的调质工艺,大厚度规格Q690钢板的显微组织均匀性得到改善,使冲击功及其稳定性得到了提高。
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李智丽(1971-),女,辽宁省盘锦市人,硕士,正高级工程师,现从事金属材料热处理及失效分析工作。
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李智丽(1971-),女,辽宁省盘锦市人,硕士,正高级工程师,现从事金属材料热处理及失效分析工作。
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李智丽(1971-),女,辽宁省盘锦市人,硕士,正高级工程师,现从事金属材料热处理及失效分析工作。
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35(3):1-4., articleTitle=回火温度对大厚度低碳高强度Q690D钢板组织和力学性能的影响, refAbstract=null)], funds=null, companyList=[AuthorCompany(id=1189619193319272568, tenantId=1146029695717560320, journalId=1185652524569653253, articleId=1188430996664889769, xref=null, ext=[AuthorCompanyExt(id=1189619193331855481, tenantId=1146029695717560320, journalId=1185652524569653253, articleId=1188430996664889769, companyId=1189619193319272568, language=EN, country=null, province=null, city=null, postcode=null, companyName=null, departmentName=null, remark=Technical Center of Inner Mongolia Baotou Steel Union Co., Ltd., Baotou 014010, Inner Mongolia Autonomous Region, China), AuthorCompanyExt(id=1189619193344438394, tenantId=1146029695717560320, journalId=1185652524569653253, articleId=1188430996664889769, companyId=1189619193319272568, language=CN, country=null, province=null, city=null, postcode=null, companyName=null, departmentName=null, remark=内蒙古包钢钢联股份有限公司技术中心, 内蒙古 包头 014010)])], figs=[ArticleFig(id=1189619196808933565, tenantId=1146029695717560320, journalId=1185652524569653253, articleId=1188430996664889769, language=EN, label=null, caption=null, figureFileSmall=vSw0JasbHeCDWno/b7Ktdw==, figureFileBig=21zDTZzsoDMU/zdgiWUTlQ==, tableContent=null), ArticleFig(id=1189619196930568383, tenantId=1146029695717560320, journalId=1185652524569653253, articleId=1188430996664889769, language=CN, label=图1, caption=
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板厚不同位置试样的冲击功, figureFileSmall=fobEMQJ7/Il0Ucw+oWVQMg==, figureFileBig=TDzhOXP5fwhgc/93U8aM+A==, tableContent=null), ArticleFig(id=1189619197576491206, tenantId=1146029695717560320, journalId=1185652524569653253, articleId=1188430996664889769, language=EN, label=null, caption=null, figureFileSmall=dA27yuRnytoRce5Nbk4/1Q==, figureFileBig=poFrRNV6iPkzxGE0RZZj9w==, tableContent=null), ArticleFig(id=1189619197656182983, tenantId=1146029695717560320, journalId=1185652524569653253, articleId=1188430996664889769, language=CN, label=图3, caption=
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| 项目 | C | Si | Mn | P | S | Cr | Ni | Mo | Nb+V+Ti | Alt | B |
| 试验钢 | 0.13 | 0.43 | 1.65 | 0.013 | 0.008 | 0.29 | 0.28 | 0.26 | 0.13 | 0.26 | 0.002 |
| GB/T 16270—2009 | ≤0.20 | ≤0.80 | ≤1.80 | ≤0.025 | ≤0.015 | ≤1.50 | ≤2.00 | ≤0.70 | 0.015~0.23 | 0.018~0.035 | ≤0.005 |
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试验钢的化学成分(质量分数) %
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| 项目 | C | Si | Mn | P | S | Cr | Ni | Mo | Nb+V+Ti | Alt | B |
| 试验钢 | 0.13 | 0.43 | 1.65 | 0.013 | 0.008 | 0.29 | 0.28 | 0.26 | 0.13 | 0.26 | 0.002 |
| GB/T 16270—2009 | ≤0.20 | ≤0.80 | ≤1.80 | ≤0.025 | ≤0.015 | ≤1.50 | ≤2.00 | ≤0.70 | 0.015~0.23 | 0.018~0.035 | ≤0.005 |
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| 编号 | 冲击功/J |
| 1 | 2 | 3 | 平均值 |
| 11 | 48.4 | 18.9 | 18.5 | 28.6 |
| 12 | 57.8 | 54.6 | 36.0 | 49.5 |
| 13 | 19.9 | 14.9 | 15.6 | 16.8 |
| 14 | 86.0 | 45.6 | 42.8 | 58.1 |
| 15 | 95.4 | 57.3 | 52.9 | 68.5 |
), ArticleFig(id=1189619198230802642, tenantId=1146029695717560320, journalId=1185652524569653253, articleId=1188430996664889769, language=CN, label=表2, caption=
不同位置-20 ℃纵向冲击试验结果
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| 编号 | 冲击功/J |
| 1 | 2 | 3 | 平均值 |
| 11 | 48.4 | 18.9 | 18.5 | 28.6 |
| 12 | 57.8 | 54.6 | 36.0 | 49.5 |
| 13 | 19.9 | 14.9 | 15.6 | 16.8 |
| 14 | 86.0 | 45.6 | 42.8 | 58.1 |
| 15 | 95.4 | 57.3 | 52.9 | 68.5 |
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