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TCS不锈钢是一种低铬的经济型铁素体不锈钢,因为热循环的影响焊接HAZ性能成为制约其广泛应用的关键。对其焊接HAZ的组织演化以及各区域热循环特征参数进行了详细研究,并根据测定的参数利用热模拟技术对焊接HAZ的力学性能进行了研究。结果表明:焊接HAZ的组织由单一铁素体基体变成铁素体加马氏体组织,其强度比母材有所提高,屈强比增大。与母材相比,细晶区韧性变化较小,可以保持在较高的水平;虽然混合晶区的韧性保持在较高水平,但不稳定;而粗晶区韧性却急剧下降。
TCS stainless steel is a low-chromium, economical ferritic stainless steel that has been the key to limiting its wide range of applications due to the effects of thermal cycling on the weld HAZ performance. The microstructure evolution of welding HAZ and the characteristic parameters of thermal cycling in each region were studied in detail. The mechanical properties of the welded HAZ were studied by thermal simulation based on the measured parameters. The results show that the microstructure of welded HAZ changes from a single ferrite matrix to ferrite plus martensite. The strength of welded HAZ is higher than that of base metal, and the yield ratio increases. Compared with the parent metal, the toughness of the fine grain changes little, which can be maintained at a relatively high level. Although the toughness of the mixed grain is kept at a high level, it is not stable; however, the toughness of the coarse grain decreases sharply.