A QUANTITATIVE STUDY OF ENVIRONMENTAL FRACTURE BEHAVIOR FOR WELD METALS OF TYPE 304 STAINLESS STEEL

J Chin Soc Corr Pro

1999, Vol. 19

Issue (5): 265-272 DOI:

Research Report

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A QUANTITATIVE STUDY OF ENVIRONMENTAL FRACTURE BEHAVIOR FOR WELD METALS OF TYPE 304 STAINLESS STEEL

Zheng Wang;;

郑州工业大学材料研究中心

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Abstract The environmental fracture behavior of 304 stainless steel base metal and three weld metals with different alloy additions(A002,A132 and A302)under as-welded and postweld heat treatment (PWHT)conditions were quantitatively studied in 0.5mol/L NaCl+2.5mol/L H2SO4 solution at room temperature.The tests were carried out with a cantilever bending test machine and the da/dt～K1 curves were determined to evaluate the resistance to environmental fracture.The micrography,fractography and electrochemical tests for corrosion were performed for mechanism study. The results showed that K ISCC of the weld metals was 30～39MPa m1/2,increasing in order of A002,A302and A132,being 62%～79% of the base metal,and their da/dt reached to (5～7)×10-6mms-1,being 2.8～3.9 times of the base metal.As the PWHT temperature increased,the susceptibility to environmental fracture for the weld metals decreased.The environmental fracture behavior of 304 base metal was controlled by stress assisted active tunnels,showing transgranular(TG)fracture.However,the environmental fracture behavior of the weld metals were mainly controlled by pre-existing actuve tunnel mechanism.showing intergranular(IG)or IG+TGmode.Since the delta ferrite in the weld metals was an anodic phase to be preferentially corroded,forming pre-existent active tunnels,the resistance to environmental fracture decreased as the ferrite content increased and a continuous network formed.The environmental fracture behavior of 304 steel weld metals was mainly dependent on the ferrite content and morphology.Both the weld metal composition and PWHT would affect the resistance to environmental fracture through the change of microstructure.

Key words: 304 steel weld metals environmental fracture threshold stress intensity crack growth rate pre-existe

Received: 18 November 1998

Corresponding Authors: Zheng Wang

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Zheng Wang. A QUANTITATIVE STUDY OF ENVIRONMENTAL FRACTURE BEHAVIOR FOR WELD METALS OF TYPE 304 STAINLESS STEEL. J Chin Soc Corr Pro, 1999, 19(5): 265-272 .

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https://www.jcscp.org/EN/ OR https://www.jcscp.org/EN/Y1999/V19/I5/265

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