Microstructure and mechanical properties of a new developed cold work die steel (SDC99) were investigated under solution treatment and comparison with Cr12MoV steel. The new developed high strength and high toughness cold work die steel has overcome the weakness of Cr12MoV which failed with tipping, fracture and collapse in services due to low toughness. The toughness achieves to 80J which is twice as Cr12MoV while the hardness is 62HRC.
Take the Liangzhu pottery as examples, an approach of form style recognition was proposed to further exploring the redesign of cultural artifacts from industrial design. Firstly, six major images of Liangzhu pottery was investigated by using KJ method and Factor Analysis; Then the relationship between the essential form factors and the major images were analyzed through Quantification Type I; Finally, the perceptual image knowledge base of Liangzhu cultural artifacts and a computer-aided form redesign system was built. Based on this system, the particular images conveyed by the cultural artifacts and the corresponding form features can be obtained, the traditional culture can be expanded. Thus the theory of form style recognition in the redesign of cultural artifacts is tested.
Under strain rate of 0.5s-1, the effect of deformation temperature on flow stress, microstructure and corrosion resistance of 2205 duplex stainless steel (DSS) was investigated. The dynamic recrystallization (DRX) of austenite phase was enhanced with the deformation temperature increasing from 850°C to 1050°C, meanwhile, the leading deformation mechanism changed from work hardening to DRX. When the deformation temperature was further increased to 1250°C, the dynamic recovery (DRV) of ferrite phase played a leading role. The specimen after deformation at 1050°C exhibited better DRX behavior, which leads to more γ/γ grain boundaries and δ/γ boundaries formation, increasing the occurrence of pitting corrosion, and it presented best corrosion resistance at 950°C.
The ledeburite carbides segregated seriously in solidification of Cr12 tool steels and the morphology is distributed in banding with fishbone shapes resulting in low toughness. Thus the tools are usually failure with tipping, fracture and collapse in services. A new high strength and high toughness tool steel was developed to adapt for the requirement of high strength materials forming. The thermodynamic theory and equilibrium principle of carbon as well as computer aided optimizing design are used in.
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