排序方式: 共有5条查询结果,搜索用时 0 毫秒
1
1.
B. Smoljan 《材料热处理学报》2004,25(5)
PHASE transformation modeling is one of the mainchallenges in modeling of heat treatment[1].The mechanism of phase transformations is not fullyunderstood and interactive influence of differentelements,austenitizing temperature,etc.usually arenot taken in account.The mistakes in phase transformation calculationcould be extremely great if a model is based only ongrain size of prior austenite,austenitizing temperatureand elemental composition of steel.Phase transformation kinetic depends also o… 相似文献
2.
Brittle material behavior and mode of failure are contrasted with those characteristics of ductile materials. The stochastic
nature of brittle fracture, which results from the random occurrence of fracture-initiating microstructural imperfections,
necessitates a probabilistic fracture mechanics approach to design with brittle materials. It is also clearly shown which
main properties of brittle materials have to be optimized to improve the reliability of mechanically loaded components made
of brittle materials. Important features of designing with brittle materials are elucidated and illustrated by an exemplary
design calculation of a ceramic disc spring. It is shown how even environmentally induced subcritical crack growth, characteristic
of ceramic materials, can be adequately accounted for in the assessment of reliability. 相似文献
3.
B. Smoljan 《Journal of Materials Engineering and Performance》2002,11(1):75-79
The algorithm and computer program are completed to simulate the quenching of complex cylinders, cones, spheres, etc. Numerical
simulation of steel quenching is a complex problem, dealing with estimation of microstructure and hardness distribution, and
also dealing with evaluation of residual stresses and distortions after quenching. The nonlinear finite volume method has
been used in numerical simulation. By the established computer program, mechanical properties and residual stresses and strains
distributions in the quenched specimen can be given at every moment of quenching. 相似文献
4.
Božo Smoljan Franjo Cajner Darko Landek 《Journal of Materials Engineering and Performance》2002,11(3):278-282
Achievements of the induction hardening of ferritic ductile iron were investigated. Ductile iron is not advisable for use
in induction hardening because of the small carbon content in the metal matrix of ferritic ductile iron. The carbon content
in the metal matrix of ductile iron can be increased by additional preparation of metal matrix before final induction heat
hardening. Wear resistance of the induction hardened ferritic ductile iron can increase as result of increased carbon content
of the metal matrix and higher hardness after induction hardening. Some heat pretreatments for metal matrix preparation were
applied before the induction hardening of ferritic ductile iron. The process parameters of the induction hardening heat pretreatment
were analyzed and optimized. According to recommended elemental composition of ferritic ductile iron and required mechanical
properties, the process parameters of the investigated induction heat pretreatment were optimized. The efficiency of pretreatment
processes of induction hardening was analyzed. Applicability and manufacture ability of engineering components by proposed
heat pretreatments were investigated. The limitations of the investigated heat pretreatment applications were estimated by
the comparison of mechanical properties of heat-treated specimens. 相似文献
5.
1