Resistance of weld joints of chrome—manganese—nickel steels to embrittlement at increased temperatures
Embrittlement of the weld joints of the investigated chrome—manganese—nickel steels in the 350–500°C range is caused primarily by processes occurring in the δ-ferrite, 475° brittleness or precipitation of excess phases at the interphase boundaries and within the δ-ferrite grains. The level of plasticity is determined not by the quantily of δ-ferrite in the structure but by the density and quantity of excess phase precipitates in it.
Aging processes occur in the weld zone at lower temperatures than in the base metal. For weld joints of the experimental steels 05Kh18G2N5T and 05Kh18G10N5M3F the maximum operating temperature for long service is 300°C and for 05Kh18G10N5M3AF steel below 300°C.
KeywordsPrecipitation Nickel Chrome Manganese Brittleness
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