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Al-Zn-Mg 계 합금의 Creep 거동에 관한 연구
박종건,최재하 ( Jong Geon Park,Jar Ha Choi ) 한국열처리공학회 1993 熱處理工學會誌 Vol.6 No.2
The static creep mechanism and behaviour of Al-Zn-Mg alloy have been investigated under condition of constant stress tension creep test in the temperature and stress range of 170-260℃, and 5-12.5㎏/㎟ respectively. The experimental result are follows ; The stress exponent value for creep was observed to about 7.3-6.43 and the activation energy for creep deformation was 44-41㎉/㏖. Larson-Miller parameter P for the crept specimens under the creep condition was obtained as P=(T+460) (log t_r+8.6). Emperical equation for the creep rate was obtained by the computer simulation as follows. 등식 Fracture was dominated by intergranular mechanism over the experimental range.
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AISI 316 스텐레스강의 O.6 Tm 에서 Creep 거동에 관한 연구
최재하,박종건 대한금속재료학회(대한금속학회) 1985 대한금속·재료학회지 Vol.23 No.10
The static and cyclic creep mechanism and behaviour of AISI 316 stainless steel have been investigated under the condition of constant and square wave stress cycling tension creep test in the temperature, stress and frequency range of 650-710℃ (0.55∼0.59 Tm), 21∼29 ㎏/㎜² (206 ∼ 285 MPa), and 3 cps, respectively. Also, the relationship between static and cyclic creep have been investigated The experimental result are follows ; The cyclic creep retardation is due to the interaction of solute atom and mobile dislocation Stress rised by dynamic strain aging was observed at high temperature tensile test. The stress exponent value for static and cyclic creep was observed to be about 5.8∼7.6 and 7.9∼7.3, respectively. The activation energy for static and cyclic creep deformation was 98.1∼92.0 and 102∼97.4 ㎉ mole, respectively. The metallographic examination of static and cyclic crept specimen have shown that the fracture type was mainly intergranular.
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