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| EFFECT OF TEMPERING TEMPERATURE ON STRESS CORROSION CRACKING BEHAVIOR OF 42CrMo HIGH STRENGTH STEEL |
| Li Guangfu Wu Rengen Lei Tingquan (Harbin Institute of Technology) |
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Abstract The effect of tempering temperature on the stress corrosion cracking behavior of 42CrMo high strength steel in 3.5% NaCl aqueous solution has been studied with Auger electron spectroscopy,electron microscopy and fracture mechanics method.Results show that,in the quenched and low temperature tempered conditions,42CrMo steel has very low K_(ISCC) and fractures intergranularly.With the rise of tempering temperature from 300℃ to 500℃.K_(ISCC) increases apparently and the fractography changes from intergranu- lar mode to a mixture of transgranular dimpled rupture and intergranular mode.Analyses show that the stress corrosion cracking behavior is mainly controlled by the distribution of carbide.In the quenched and low temperature tempered conditions,preddominant distribu- tion of carbide along prior austenitic grain boundaries is the main cause leading to inter- granular fracture and very low K_(ISCC).In high temperature tempered conditions,the com- bined effects of the coarsening of the carbide along the grain boundaries and the precipita- tion of much carbide within grains result in the apparent increase of K_(ISCC) and the change of fractography from intergranular to mixed mode.
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Received: 25 February 1991
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