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    • 1. 发明专利
    • Inspecting method of metallic member
    • 金属会员检查方法
    • JPS59142459A
    • 1984-08-15
    • JP1603683
    • 1983-02-04
    • Hitachi Ltd
    • YOSHIOKA TAKATOSHIKIRIHARA SEISHINSHIGA MASAOYOSHIDA TAKEHIKOIIJIMA KATSUKI
    • G01N29/04G01M13/04G01N29/14
    • G01N29/14G01N2291/2693G01N2291/2696
    • PURPOSE:To improve the defect detecting accuracy of a center hole by adding internal pressure to the center hole of a rotor shaft, and inspecting the center hole by using jointly an acoustic emission method and the conventional inspecting method. CONSTITUTION:An acoustic emission method (AE method) being a dynamic nondestructive inspecting method is applied to a defect detection of a center hole of a rotor shaft. As for the AE measuring method, a multi-channel AE measuring device 4 which is capable of marking a position is used, and two pieces each of AE detectors 3 are installed to both ends of a rotor shaft 7. Subsequently, internal pressure 3 is added to a center hole 2 of the rotor shaft 7. When a crack exists, stress is concentrated on the tip part of its crack and an elastic deformation is caused, as a result of addition of the internal pressure. Accordingly, the circumference of a position where a defect is generated, which is detected by the AE measuring device is inspected minutely by the conventional inspecting method. In this way, the defect detecting accuracy of the center hole is improved.
    • 目的:通过向转子轴的中心孔内加上内压,通过联合声发射法和常规检查方法检查中心孔,提高中心孔的缺陷检测精度。 构成:将作为动态非破坏性检查方法的声发射法(AE法)应用于转子轴的中心孔的缺陷检测。 对于AE测量方法,使用能够标记位置的多通道AE测量装置4,并且将两个AE检测器3安装在转子轴7的两端。随后,内部压力3为 添加到转子轴7的中心孔2.当存在裂纹时,由于内压的增加,应力集中在其裂纹的尖端部分并且引起弹性变形。 因此,通过常规的检查方法检查由AE测量装置检测到的产生缺陷的位置的周边。 以这种方式,提高了中心孔的缺陷检测精度。
    • 6. 发明专利
    • JPH0563544B2
    • 1993-09-10
    • JP163087
    • 1987-01-09
    • HITACHI LTD
    • SHIGA MASAOFUKUI HIROSHIKURYAMA MITSUOIIJIMA KATSUKIMAENO YOSHIMITAKAHASHI SHINTAROIIZUKA NOBUYUKIKUROSAWA SOICHIWATANABE YASUOHIRAGA MAKOTO
    • C22C38/00C22C19/05C22C19/07C22C38/46C22C38/48C22C38/54F01D5/00F01D5/06F01D5/28
    • This new heat-resistant steel has the following component compsn. (1) C (0.05-0.2 wt.%), Si (0.5 wt.% or less), Mn (0.6 wt.% or less), Cr (8-13 wt.%, Mo (1.5-3 wt.%), Ni (2-3 wt.%), V (0.05-0.3 wt.%), Nb and/or Ta (total amount : 0.02-2.0 wt.%), N (0.02-0.1 wt.%), Fe (the remaining wt.%), Mn/Ni is not more than 0.11 (2) C (0.07-0.15 wt.%), Si (0.01 or 0.1 wt.%), Mn (0.1-0.4 wt.%), Cr (11-12.5 wt.%), Ni (2.2-3.0 wt.%), Mo (1.8-2.5 wt.%), Nb and/or Ta (total amount:0.04 - 0.08 wt.%), Fe (the remaining wt.%), Mn/Ni = 0.04-0.10 (3) C (0.05-0.2 wt.%), Si (0.5 wt.% or less), Mn (0.6 wt.% or less), Cr (8-13 wt.%), Mo (1.5-3 wt.%), Ni (2-3 wt.%), V (0.05-0.3 wt.%), Nb and/or Ta (total amount : 0.02-0.2 wt.%), N (0.02-0.1 wt.%), W (1 wt.% or less), Co (0.5 wt.% or less), Cu (0.5 wt.% or less), B (0.01 wt.% or less), Ti (0.5 wt.% or less), Al (0.3 wt.% or less). Zr (0.1 wt.% or less), Hf (0.1 wt.% or less), Ca (0.01 wt.% or less), Mg (0.01 wt.% or less), Y (0.01 wt.% or less), rare earth elements (0.01 wt.% or less), Fe (the remaining wt.%). (1) has characteristics such as creep rupture strength of at least 50 kg/mm2 at 450 deg. C for 105 hours and a 25 V-notch Charpy impact value of at least 5 Kg/m/cm2 after heat treatment at 500 deg. C for 103 hours. Compsn. (2) has the annealed martensite structure. This heat-resistant steel is used for the turbine discs of a gas turbine which consists of a turbine shaft, a number of turbine discs, a number of compression discs connected to the distant pieces by compressor stacking bolts, compressor blades implated in the compressor discs and a compressor stub shaft shaped integrally at the initial stage of the compressor disc.