Low-temperature interrupted yield of structural alloys

Strizhalo, V. A.; Vorob’ev, E. V.

doi:10.1007/bf01151125

Cited by 7 publications

(4 citation statements)

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“…The manifestation of the effect depends in a complex manner on the properties of material and loading conditions. The modeling of the jumplike deformation process makes it possible to greatly reduce complex and expensive multiple-factor experimental investigations in liquid helium.Among the works that are currently under way in this direction, [2][3][4][5][6][7][8][9] are noteworthy. The model presented in [2] is based on informatics methods (cellular automatons), and the models considered in [3, 4] may be conventionally classed as "physical" ones, for they include not only characteristics of dissipation and heat-exchange processes with reference to the thermal mechanism of adiabatic deformation, but also dislocation parameters and give therefore only qualitative description of the phenomenon.…”

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confidence: 99%

“…Such peculiarities and the influence of effective mass are not taken into account either in the formulation of the model presented in [7], driving force being absent. The model presented in [8], which was constructed for the estimation of jump duration, proved inadequate in respect to this characteristic since it does not include inertial force, and load is applied instantly. The model presented in [9], which was developed in order to obtain an analytical solution for its investigation, describes not precisely enough in some cases the jump process since it does not take into account such peculiarities of deformation as hardening variation and its nonlinear nature, reduction of specimen cross section, dependence of jump duration on the characteristics of the system, etc.…”

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confidence: 99%

“…Value of DT max can be calculated for individual jumps [8,13]. However, to solve the problem of describing any jump of the totality of jumps, the relation D …”

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Modeling of the process of low-temperature jumplike deformation of metals

Vorob’ev

Anpilogova

2011

Strength Mater

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A nonlinear model of the process of low-temperature discontinuous yielding of metals has been constructed, which allows the totality of strain jumps to be described as a function of the mechanical properties of material and dynamic characteristics of the loading system. The adequacy of the model has been experimentally verified for austenitic steel and an aluminum alloy.Introduction. Deep freezing (T < 30 K) gives rise to an effect of low-temperature jumplike deformation [1]. It is accompanied by considerable heating and localization. A load decrease, which reaches more than a half of the initial level for some materials, corresponds to each jump. Such an abrupt change from elastic deformation to adiabatic plastic flow is typical of high-strength steels and alloys and is a jumplike decrease in the load-carrying ability of structural element with possible reaching of excessive strain or fracture. The manifestation of the effect depends in a complex manner on the properties of material and loading conditions. The modeling of the jumplike deformation process makes it possible to greatly reduce complex and expensive multiple-factor experimental investigations in liquid helium.Among the works that are currently under way in this direction, [2][3][4][5][6][7][8][9] are noteworthy. The model presented in [2] is based on informatics methods (cellular automatons), and the models considered in [3, 4] may be conventionally classed as "physical" ones, for they include not only characteristics of dissipation and heat-exchange processes with reference to the thermal mechanism of adiabatic deformation, but also dislocation parameters and give therefore only qualitative description of the phenomenon. In [4], a model constructed on the basis of the so-called electromechanical analogy was also proposed. The purely mechanical model [5] allows one to study the effect of the magnitude of overload as an analog of thermal softening and other factors on the development of strain jump at room temperature. In [6], the jump process in the case of twinning of aluminum alloy single crystals is modeled mathematically with assumptions of the instantaneous application of driving force and the absence of strain hardening. However, the possibility of nonisothermality of the process and other peculiarities of deformation of metals at temperatures close to absolute zero are not considered. Such peculiarities and the influence of effective mass are not taken into account either in the formulation of the model presented in [7], driving force being absent. The model presented in [8], which was constructed for the estimation of jump duration, proved inadequate in respect to this characteristic since it does not include inertial force, and load is applied instantly. The model presented in [9], which was developed in order to obtain an analytical solution for its investigation, describes not precisely enough in some cases the jump process since it does not take into account such peculiarities of deformation as hardening variation and its nonlinear nature...

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Modeling of the process of low-temperature jumplike deformation of metals

Vorob’ev

Anpilogova

2011

Strength Mater

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“…In fact, this phenomenon was commonly observed in 316LN, 304L, medium-entropy alloy, etc. [ 18 , 19 , 20 ], and was interpreted by twinning, martensite transformation, the formation of burst dislocations or adiabatic deformation [ 19 , 20 , 21 , 22 ]. However, in the present work, the martensite transformation has not occurred at 4 K, indicating that it is not a reason for the formation of serrations.…”

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Temperature Dependence of Deformation Behaviors in High Manganese Austenitic Steel for Cryogenic Applications

Chen

Ren

et al. 2021

Materials

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The deformation structure and its contribution to strain hardening of a high manganese austenitic steel were investigated after tensile deformation at 298 K, 77 K and 4 K by means of electron backscatter diffraction and transmission electron microscopy, exhibiting a strong dependence of strain hardening and deformation structure on deformation temperature. It was demonstrated that sufficient twinning indeed provides a high and stable strain hardening capacity, leading to a simultaneous increase in strength and ductility at 77 K compared with the tensile deformation at 298 K. Moreover, although the SFE of the steel is ~34.4 mJ/m2 at 4 K, sufficient twinning was not observed, indicating that the mechanical twinning is hard to activate at 4 K. However, numerous planar dislocation arrays and microbands can be observed, and these substructures may be a reason for multi-peak strain hardening behaviors at 4 K. They can also provide certain strain hardening capacity, and a relatively high total elongation of ~48% can be obtained at 4 K. In addition, it was found that the yield strength (YS) and ultimate tensile strength (UTS) linearly increases with the lowering of the deformation temperature from 298 K to 4 K, and the increment in YS and UTS was estimated to be 2.13 and 2.43 MPa per 1 K reduction, respectively.

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Simulation of low-temperature discontinuous yield by the method of additional pulse loading

Strizhalo

Vorob’ev

1997

Strength Mater

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Low-temperature interrupted yield of structural alloys

Cited by 7 publications

References 1 publication

Modeling of the process of low-temperature jumplike deformation of metals

Modeling of the process of low-temperature jumplike deformation of metals

Temperature Dependence of Deformation Behaviors in High Manganese Austenitic Steel for Cryogenic Applications

Simulation of low-temperature discontinuous yield by the method of additional pulse loading

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