Haiyun Chen

Research on Deformation-Induced Martensite of the Austenite Stainless Steel Bellows Based on Magnetism Testing Method

Stainless steel bellows expansion joint is an important part of city gas pipelines. In recent years, accidents occur frequently due to stress corrosion. The research on failure mechanism for bellows has high practical significance. According to magnetic variety of the deformation-induced martensite, the martensite phase content was tested by using the MP30E-S measurement instrument, for the bellows made of the SUS304 and SUS316L materials separately formed by machine-bulge method and SUS304 materials formed by hydraulic pressure method which there is or not a solution treatment respectively. The results showed that, there are great relations between the martensite phase content and materials, deformation rate, and heat treatment. The martensite phase content of SUS316L is less than SUS304, the more martensite phase content because the more deformation rate, there are less and even martensite phase after solution treatment.© 2012 ASME

Research on Defects Examination and Crack Assessment for Cast Iron Dryer

The strength and hardness tests to the experiment dryer were carried on, from the relation of strength and hardness, the relative hardness RH is 0.8 according to ‘principle met using’. The velocity of sound should be measured first in the thickness measurement, the ‘false’ thickness phenomenon in dryer flange and the convex transition segment were discovered. The ultrasonic examination characteristics of the cast iron dryer was analyzed, the sensitivity of various sensors were carried on. The small angle double crystal longitudinal wave sensor can examine the Φ3 equivalent diameters of the volume defects, and the big angle double crystal longitudinal wave sensor can examine 2 mm deep surface crack of the body and the transition area. The safety assessment on 2 mm deep surface crack was carried on.© 2009 ASME