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基于多区LMP法,利用TP347H钢的高温(700℃、750℃)短时(≤5×103 h)试验数据预测其长时持久强度(600～750℃,5×103～2×105 h).结果表明:在应力-时间图中根据σ/σTS的特定比值对应力分区,用低应力-长时区LMP参数中的C值计算长时持久强度,其预测值与真实值吻合良好;与传统的单区LMP法相比,多区LMP法的应用不仅显著降低了持久强度的过估倾向而且大大缩短了试验时间,为这类钢的长时持久强度评估提供了准确而有效的方法.
Based on the multi-zone LMP method, the long-term strength (600-750 ℃, 5 × 103-2 × 105 h) of TP347H steel was predicted based on the test data of high temperature (700 ℃, 750 ℃) The results show that the long-term strength of long-term strength is calculated by the C value of LMP parameter in low stress-long time zone according to the specific ratio of σ / σTS in stress-time diagram, and the predicted value is in good agreement with the true value Compared with single-zone LMP method, the application of multi-zone LMP method not only significantly reduces the tendency of over-estimation of long-lasting strength but also greatly shortens the test time, which provides an accurate and effective method for long-term strength evaluation of such steels.