Leitner Silvia, Winter Gerald, Klarner Jürgen, Antretter Thomas, Ecker Werner
Materials Center Leoben Forschung GmbH, Roseggerstraße 12, 8700 Leoben, Austria.
Voestalpine Tubulars GmbH & Co KG, Alpinestrasse 17, 8652 Kindberg-Aumühl, Austria.
Materials (Basel). 2023 Mar 23;16(7):2568. doi: 10.3390/ma16072568.
Quantitative and qualitative residual stress evolution in low-alloyed steel during heat treatment is investigated on three different length scales for sourgas resistant seamless steel tubes: on the component level, on the level of interdendritic segregation and on precipitate scale. The macroscopic temperature, phase and stress evolution on the component scale result from a continuum model of the heat treatment process. The strain and temperature evolution is transferred to a mesoscopic submodel, which resolves the locally varying chemistry being a result of interdendritic segregation. Within the segregation area and the surrounding matrix precipitates form. They are categorized with respect to their tendency for formation of microscopic residual stresses. After rapid cooling macroscopic stresses up to 700 MPa may form dependent on the cooling procedure. Mesoscopic stresses up to Δ50 MPa form depending on the extent of segregation. Carbides and inclusions occuring in low-alloyed steel are ranked by their tendency for residual stress formation in the iron matrix. This scale bridging study gives an overview of residual stresses, their magnitude and evolution on three different length scales in low-alloyed steels and the results presented can serve as a input for steel design.
针对抗硫无缝钢管用低合金钢，在三个不同长度尺度上研究了其在热处理过程中残余应力的定量和定性演变：构件尺度、枝晶间偏析尺度和析出相尺度。构件尺度上的宏观温度、相和应力演变由热处理过程的连续介质模型得出。应变和温度演变被传递到一个细观子模型，该模型解析了由枝晶间偏析导致的局部化学成分变化。在偏析区域及其周围基体中会形成析出相。根据它们产生微观残余应力的倾向对其进行分类。快速冷却后，取决于冷却过程，可能会形成高达700MPa的宏观应力。取决于偏析程度，会形成高达Δ50MPa的细观应力。低合金钢中出现的碳化物和夹杂物按其在铁基体中产生残余应力的倾向进行排序。这项跨尺度研究概述了低合金钢中残余应力及其在三个不同长度尺度上的大小和演变情况，所呈现的结果可作为钢材设计的输入依据。
