High strength microalloyed CMn(V–Nb–Ti) and CMn(V–Nb) pipeline steels processed through CSP thin-slab technology: Microstructure, precipitation and mechanical properties
High strength microalloyed CMn(V–Nb–Ti) and CMn(V–Nb) pipeline steels processed through CSP thin-slab technology: Microstructure, precipitation and mechanical properties
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DOI：
10.1016/j.msea.2006.03.026
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发表时间：
2006-05
期刊：
影响因子：
6.4
通讯作者：
C. Reip;S. Shanmugam;R. Misra
中科院分区：
文献类型：
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作者：
C. Reip;S. Shanmugam;R. Misra
紧凑式带钢生产（CSP）技术是生产符合API标准的低成本微合金化高强度管线钢的重要的即将到来的加工路线。采用CSP技术生产的CMn（VNbTi）和CMn（VNb）热轧带钢具有细晶粒铁素体-珠光体显微组织和低体积分数的低相变产物（非多边形铁素体：针状铁素体/贝氏体），具有高强度和优异的低温韧性（最高可达−60°C）。对于厚度在6和12.5mm之间的带材，实现了高达590 MPa的屈服强度水平和高达680 MPa的拉伸强度水平。CMn（VNb）钢在200 ~ 400 J/cm ~ 2范围内表现出优异的缺口韧性，尽管其屈服强度高于CMn（VNbTi）钢（≥ 100 MPa）。CMn（VNbTi）和CMn（VNb）钢中存在的析出物的特征在于在形态，尺寸和化学，和晶体学。微合金元素Ti、Nb和V在两种钢的铁素体基体中形成M4 C3型碳化物。CMn（VNbTi）和CMn（VNb）的多元微合金化途径分别导致形成双相和三相碳氮化物。描述了开发工作的结果。
Compact strip production (CSP) technology is an important upcoming processing route to produce low cost microalloyed high strength pipeline steels that meet the API standards. Hot strips of CMn(VNbTi) and CMn(VNb) steel grades with fine-grained ferrite–pearlite microstructure and small volume fraction of lower transformation product (non-polygonal ferrite: acicular ferrite/bainite) were produced using CSP technology with high strength and excellent low-temperature toughness up to −60°C. For strip thicknesses between 6 and 12.5mm, yield strength levels of up to 590MPa and tensile strength levels up to 680MPa were achieved. The CMn(VNb) steel exhibited outstanding notch-toughness in the range of 200 and 400J/cm2, in spite of its higher yield strength (∼100MPa or greater) over the CMn(VNbTi) steel. The precipitates present in CMn(VNbTi) and CMn(VNb) steels were characterized in terms of morphology, size and chemistry, and crystallography. The microalloying elements, Ti, Nb, and V form M4C3type of carbides in the ferrite matrix of both the steels. The multi-microalloying approaches of CMn(VNbTi) and CMn(VNb) results in the formation of duplex and triplex carbonitrides, respectively. The results of the development effort are described.