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首页> 外文期刊>Materials Science and Engineering >Analysis of creep rates of tempered martensitic 9%Cr steel based on microstructure evolution
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Analysis of creep rates of tempered martensitic 9%Cr steel based on microstructure evolution

机译：基于组织演变的回火马氏体9％Cr钢蠕变速率分析

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摘要

The creep rates of tempered martensitic 9Cr-3W-3Co-VNb steel with different carbon and boron concentrations were investigated with emphasis on the behavior in the transient creep region. Creep tests were carried out at 650 ℃ up to about 7 ×104 h and at 700℃ up to about 4 × 10~3 h. The precipitates were identified as M_(23)C_(6 )carbides and MX carbonitrides after tempering. The movement and annihilation process of excess dislocations in the transient region is controlled by not only the movement of dislocations in the matrix but also the annihilation of dislocations at lath and block boundaries. Sub-boundary hardening is shown to be the most important strengthening mechanism in creep of the present steel and is enhanced by fine dispersions of precipitates along boundaries. The reduction of carbon concentration to very low values promotes fine distribution of MX nitrides along boundaries and also eliminates M_(23)C_6 carbides. The addition of boron reduces the coarsening rate of M_(23)C_6 carbides along boundaries near prior austenite grain boundaries during creep.
机译：研究了碳和硼浓度不同的回火马氏体9Cr-3W-3Co-VNb钢的蠕变速率，重点是在瞬态蠕变区域的行为。蠕变试验在650℃下进行约7×104 h，在700℃下进行约4×10〜3 h。回火后，析出物被鉴定为M_（23）C_（6）碳化物和MX碳氮化物。过渡区中过量位错的运动和an灭过程不仅受基质中位错的运动控制，而且还受板条和块体边界处位错的an灭控制。亚边界硬化被证明是本发明钢蠕变中最重要的强化机制，并且通过沿边界析出物的细微分散而得以增强。将碳浓度降低到非常低的值会促进MX氮化物沿边界的精细分布，并且消除了M_（23）C_6碳化物。硼的添加降低了蠕变过程中M_（23）C_6碳化物沿先前奥氏体晶界附近的边界的粗化率。

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