An evaluation of cast stainless steel (CF8M) fracture toughness caused by thermal aging at 430°C View Full Text


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Article Info

DATE

2002-07

AUTHORS

Jae Do Kwon, Jae Hyun Ihn, Joong Cheul Park, Sung Jong Choi, Yun Won Park

ABSTRACT

Cast stainless steel may experience embrittlement when it is exposed approximately to 300°C for a long period. In the present investigation, the three classes of the thermally-aged CF8M specimen were prepared using an artificially-accelerated aging method. After the specimens were held for 300, 1800 and 3600hrs. at 430°C, respectively, the specimens were quenched in water which is at room temperature. Load versus load line displacement curves andJ- R curves were obtained using the unloading compliance method,JIC values were obtained using the ASTM E 813–87 and ASTM E 813–81 methods. In addition to these methods,JIC values were obtained using the SZW (stretch zone width) method described in JSME S 001–1981. The results of the unloading compliance method areJQ = 543.9kj/m2 for virgin materials. The values ofJIC for the degraded materials at 300, 1800 and 3600hrs. are obtained 369.25kJ/m2, 311.02kJ/2, 276.7kJ/2, respectively. The results obtained by the SZW method are compared with those obtained by the unloading compliance method. Both results are quite similar. Through the elastic-plastic fracture toughness test, it is found that the value ofJIC is decreased with an increase of the aging time. More... »

PAGES

902-910

References to SciGraph publications

  • 1980-04. Embrittlement of ferritic stainless steels in METALLURGICAL TRANSACTIONS A
  • 2000-01. Effect of temperature on the fracture toughness of A516 Gr70 steel in KSME INTERNATIONAL JOURNAL
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    http://scigraph.springernature.com/pub.10.1007/bf02949718

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    http://dx.doi.org/10.1007/bf02949718

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