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首页> 外文期刊>ISIJ international >Evolution of Lath Substructure and Internal Stresses in a 9% Cr Steel during Creep
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Evolution of Lath Substructure and Internal Stresses in a 9% Cr Steel during Creep

机译：蠕变过程中9％Cr钢的板条亚结构和内部应力的演变

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摘要

The changes in the dislocation substructure and internal stresses in a tempered 9% Cr heat resistant steel during creep at 923 K were studied. The mean lath size gradually increased from 330 nm for the initial tempered state to 740 nm once the specimen had crept to failure under a nominal stress of 118 MPa after 1 271 hours. Correspondingly, the dislocation density within the lath decreased from 6.2 × 10~(14) m~(-2) to ~10~(14) m~(-2). The tempered structure of the martensite lath was characterised by large lattice curvatures, which were attributed to a high density of dislocations with like signs and the long-range stress fields originating from the martensite lath boundaries. An internal stress of 49 MPa, as evaluated by measuring the lattice curvature within individual laths in specimens crept to 1% (just after transient creep stage), is comparable to the threshold stress of 51 MPa estimated from the creep rate and stress relationship. The improved creep resistance of advanced 9% Cr martensitic steel results from both dispersion strengthening and the internal stresses of the martensite lath substructure.
机译：研究了在923 K下蠕变过程中回火的9％Cr耐热钢的位错亚结构和内应力的变化。一旦样品在1 271小时后在118 MPa的名义应力下蠕变失效，平均板条尺寸就从初始回火状态的330 nm逐渐增加到740 nm。相应地，板条内的位错密度从6.2×10〜（14）m〜（-2）降低至〜10〜（14）m〜（-2）。马氏体板条的回火结构以较大的晶格曲率为特征，这归因于具有类似符号的高位错密度和源自马氏体板条边界的长程应力场。通过测量蠕变到1％（仅在瞬态蠕变阶段后）的单个板条中的晶格曲率评估得出的49 MPa的内部应力，与根据蠕变速率和应力关系估算的51 MPa的阈值应力相当。先进的9％Cr马氏体钢的抗蠕变性提高是由于弥散强化和马氏体板条亚结构的内应力共同作用。

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