HOT WORKING CHARACTERISTICS OF HIGH-STRENGTH NON-MAGNETIC STAINLESS STEEL Cr21Ni13Mn5Mo2N
The Gleeble 3800 thermal simulator was used to conduct hot compression experiments on austenitic stainless steel Cr21Ni13Mn5Mo2N.The relationship between high-temperature deformation,strain rate,and temperature of the steel was studied,and a hyperbolic sine constitutive equation was established.Finally,the thermal activation energy was 679.58 kJ/mol,and the strain rate factor Z parameter was=(ε)exp(679 580/RT).The experimental results show that dynamic recrystallization occurs during the deformation process of the material at 950～1 200 ℃ and 0.01～10 s-1 conditions.At 950 ℃ and a strain rate of 0.1 s-1,the deformation amount at the beginning of recrystallization is 10％.The rheological stress shows a significant downward trend with increasing temperature and decreasing strain rate,decreasing from 326 MPa at 950 ℃and 10 s-1 to 75 MPa at 1200 ℃ and 0.01 s-1.By combining microstructure analysis and forging experiments,the cracking problem of compressed specimens was thoroughly investigated.The results showed that the aggregation of carbon and oxides at grain boundaries worsened the plasticity of grain boundaries,leading to the formation of crack sources and gradual expansion at this location during hot deformation.Through heat treatment and hot deformation tests,it was determined that the carbon and oxide at the grain boundaries of Cr21Ni13Mn5Mo2N electroslag ingots were eliminated after 6 hours of solid solution at 1 170 ℃.The bonding force at the grain boundaries of the electroslag ingots was significantly improved,and the problem of forging cracking was successfully eliminated,achieving a significant increase in the yield of forging.
stainless steelCr21Ni13Mn5Mo2Ncompression thermal simulationconstitutive equationhot working plasticity
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