2.2 Chemical analysis
According to GB / T4336-2016 carbon steel and low and medium alloy steel spark source atomic emission spectrometric analysis method (conventional method) , the 17-4PH sample of the broken blade was analyzed by the spark source atomic emission spectrometer (OBLF GS1000 -Ⅱ). The chemical analysis results of the cracked blade are listed in Table 1. The chemical composition of standard 17-4PH stainlesssteel from GB/T 8732 is given for comparison. It is found that the chemical composition of the blade is consistent with the design standard.
Table 1 Chemical composition of the investigated 17-4PH (mass%).