DYNAMIC STRAIN AGING BEHAVIOR OF K40S ALLOY
来源期刊：Acta Metallurgica Sinica2003年第6期
论文作者：X.F.Sun F.M.Yang Z.Q.Hu H.R.Guan
Key words：dynamic strain aging; serrated flow; strain exponent; activation energy;
Abstract: The dynamic strain aging behavior during tensile tests of K40S alloy has been investigated in the temperature range of 25-1100℃ with the strain rate range from 10-4to 10-3 s-1. The results show that four different types of serration, identified as A,B, C and E type serration were observed in the temperature range of 300-600℃. The strain exponents for onset of the serrated flow were calculated as 1.21, 2. 79 and 1.61,and the activation energies as 121, 40 and 67kJ/mol for E, B and C type serration respectively. The main mechanism for dynamic strain aging discussed in light of the strain exponent and the activation energy.
X.F.Sun1，F.M.Yang1，Z.Q.Hu1，H.R.Guan1
(1.Institute of Metal Research, The Chinese Academy of Sciences, Shenyang 110016, China)
Abstract:The dynamic strain aging behavior during tensile tests of K40S alloy has been investigated in the temperature range of 25-1100℃ with the strain rate range from 10-4to 10-3 s-1. The results show that four different types of serration, identified as A,B, C and E type serration were observed in the temperature range of 300-600℃. The strain exponents for onset of the serrated flow were calculated as 1.21, 2. 79 and 1.61,and the activation energies as 121, 40 and 67kJ/mol for E, B and C type serration respectively. The main mechanism for dynamic strain aging discussed in light of the strain exponent and the activation energy.
Key words:dynamic strain aging; serrated flow; strain exponent; activation energy;
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