共查询到19条相似文献,搜索用时 125 毫秒
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针对低合金钢板延伸率不合问题,采用低倍检验、金相分析、扫描电镜等手段对不合钢板及铸坯的组织和断口形貌进行分析研究,结果表明,引起低合金钢板延伸率不合的根本原因是铸坯的成分偏析导致粒状贝氏体硬相组织、条状MnS夹杂物和中间裂纹。通过采取相应措施,改善了铸坯内部质量,提高了低合金钢板的延伸率。 相似文献
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通过光学显微镜、电子探针等科研手段,对S355J2钢板探伤不合试样进行研究。结果表明,探伤不合的主要原因是钢板基体存在中心偏析、内部裂纹以及夹杂物等。经过对冶炼、连铸及轧钢、热处理工艺加以改进,提高了钢板的内部质量及探伤合格率。 相似文献
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运用金相显微镜、扫描电镜等手段,对济钢生产的70 mm厚度规格Q345D-Z25钢板进行显微组织分析。结果表明,钢板中心存在的裂纹、Mn S夹杂物以及组织偏析是造成此次钢板探伤不合的主要原因。通过提高钢水纯净度、铸坯以及钢板内部质量,探伤合格率得到显著提高。 相似文献
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采用低倍检测、金相检测、扫描电镜及能谱仪等检测方法对某钢厂Q345D钢板探伤缺陷进行分析。结果表明中心成分偏析、夹杂物、异常组织和裂纹是容易造成钢板探伤不合格的原因。 相似文献
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通过低倍检查、金相显微镜、扫描电镜以及能谱仪等检测手段对钢板拉伸断口形貌、夹杂物和显微组织进行观察和分析,研究Q420q E钢板探伤不合的原因。分析发现,钢板厚度中心区域珠光体带中存在着硫化物、微量元素偏聚及贝氏体组织;在热应力、组织应力和有害元素偏聚的共同作用下,引发内部微裂纹从而导致Q420q E钢板探伤不合。 相似文献
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In this work several methods including sulphur printing,modified spark spectrum analysis and SPEED-SEM-EDX methods were used to study the morphology,composition and distribution of inclusions in pipeline steel.The procedure for the last-mentioned method includes:metal sample preparation using Selective Potentiostatic Etching by Electrolytic Dissolution (SPEED) together with inclusion observation and detection using SEM-EDX equipment.The results of sulphur printing and spark spectrum analysis showed that there was a well-defined centerline containing relatively high concentrations of sulphur in the steel slab studied in this work.The results of SEM study showed that most inclusions found in the steel samples were globular in morphology,and roughly 2-5 micrometers in size.The inclusions were rich in sulphur and manganese.Some inclusions with a bright globular shape contained Al,Ca,Mn and S,and were likely composed of MnS,CaS and calcium aluminate.It was concluded that sulphur printing is a convenient and inexpensive method for inclusion analysis,Spark Spectrum Analysis provides a complete and self-contained technique for inclusion detection,and the SPEED-SEM-EDX procedure is best suited for in-situ and three-dimensional observation of inclusions. 相似文献
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针对中板生产线厚规格钢板表面裂纹率高的现象,借助金相分析,结合不同厚度钢板熔炼成分和轧制规程进行分析,认为厚规格钢板中裂纹敏感性元素Nb、Als含量高、Ti含量不充足和未采用大压下轧制规程是厚规格钢板裂纹率高的原因,并提出了改善措施。 相似文献
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The stress oriented hydrogen induced cracking (SOHIC) is a typical hydrogen embrittlement phenomenon occurring in the linepipe steels exposed to sour environment containing H 2 S gas.However,even recently,the cracking mechanism of SOHIC has not been clarified because of lacking in the empirical data on the actual failure mode of SOHIC cracking.The factors affecting SOHIC are discussed in terms of metallurgy of high strength linepipe steel and hydrogen electrochemistry.The cracking mechanisms of SOHIC are examined by comparing them with the empirical failure mode of SOHIC which is developed by observation of the actual fracture sites of the hydrogen induced blister cracking (HIBC) and secondary cracks.Finally,the correlation between SOHIC and HIC is discussed. 相似文献
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通过工业生产中X60/X65管线钢的抗HIC性能试验,分析了非金属夹杂物、显微组织等对管线钢抗HIC性能的影响,并对出现裂纹的断面进行了扫描电镜分析,结果表明,MnS夹杂物和带状组织是影响抗HIC性能的主要因素。 相似文献
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中碳低合金铸钢贝氏体中脊特征研究 总被引:1,自引:0,他引:1
利用光学显微镜,SEM,TEM研究了中碳低合金铸钢态下具有中脊的贝氏体形态和中脊特征,并探讨了带中脊贝氏体的相变机制,研究表明,中脊存在于不同形态的贝氏体中;中脊先天贝氏体铁素体基体核与长大,是与基体贝氏体衬度不同的单相氏体铁素体,类似片状马氏切变形核与长大,第一片贝氏体中脊可贯穿整个晶粒。 相似文献
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通过扫描电镜、能谱分析、金相检验等手段,分析了造成09CuPCrNi-A钢板剪切后横断面上出现中心开裂及钢板冲击韧性波动的原因。确认钢板剪切后中心开裂是由P及S偏析所致,这也是导致钢板冲击韧性波动的原因。 相似文献