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在今后动力工程的发展中,透平的尺寸将增大,并将采用焊接转子和提高材料的强度。所有这些措施均必须解决对具有缺陷的透平转子的脆断趋向进行估价的问题。本实验曾对18FDOV,34CrMoA,24Cr2NiMoVA 三种钢制成的全尺寸锻件,用 CL—30焊条以手工焊制成的,以及用10CrMo 及08CrNi2Mo 两种焊丝按自动焊制成的全断面焊接接头进行了分析。并研究了如何根据这些实验数据对材料的脆断趋向作出定性的与定量的估价方法,实验结果的处理均以线弹性断裂力学的概念为依据。特别注意到确定50%断口剪断组织转变温度(50%FATT)与临界应力强度因子 K_(Ic)间的关系。曾根据转子材料的性质对几个
In the future power engineering development, the size of the turbine will increase, and will use the welding rotor and improve the strength of the material. All of these measures must address the issue of evaluating the tendency of brittle fractures of defective turbine rotors. The experiment has 18FDOV, 34CrMoA, 24Cr2NiMoVA three kinds of steel made of full-size forgings, CL-30 electrode with a hand-made welding, and with 10CrMo and 08CrNi2Mo two kinds of welding wire made by automatic welding full-face welded joints Analysis. And how to evaluate qualitatively and quantitatively the brittle fracture tendency of materials based on these experimental data has been studied. The experimental results are all based on the concept of linear elastic fracture mechanics. Particular attention was paid to determining the relationship between the 50% cut-off Tissue Transition Temperature (50% FATT) and the critical stress intensity factor K_ (Ic). There are several depending on the nature of the rotor material