金属蠕变律及蠕变行为研究

摘要

蠕变过程中，材料内部状态的不断演化，使得材料的蠕变行为发生改变。本文提出考虑损伤和硬化影响的蠕变律。利用该蠕变律讨论了12Cr1MoV钢蠕变行为。分析结果表明，c在蠕变过程中始终变化，第二阶段仅仅是c相对稳定的阶段，其相对稳定程度和持续范围与载荷大小有关。在相同寿命分数下，不同应力水平引起的硬化状态也不相同。%With material internal state varying, creep behavior keeps onchanging during creep． A creep law which takes account of damage and hardening influence is proposed． Creep behavior of 12Cr1MoV steel is discussed． Analysis shows that creep rate keeps changing during creep． The secondary stage of creep is merely relative steady stage, and degree of relative steady and duration life fraction depend on applied stress． Different stresses cause the same damage state but different hardening state in conditions of the same exposure time fraction．