The twinned substructure of lenticular martensite in a quenched Fe–33Ni alloy was studied.In contrary to the traditional viewpoint that the twinned laths come from{112}<111>deformation twins and show insignific...The twinned substructure of lenticular martensite in a quenched Fe–33Ni alloy was studied.In contrary to the traditional viewpoint that the twinned laths come from{112}<111>deformation twins and show insignificant hardening,we demonstrate that they are actually originated from the twinned Kurdjumov Sachs(KS)variants and can give rise to 3–4 times hardening up to~420 HV(~130 HV for the starting sample).The underlying mechanisms responsible for the propensity for twinned variants and the carbon-independent hardening for Fe–Ni system were discussed.展开更多
The influence of 0.01% to 0. 25% of Aluminum content （in mass percent） on the mechanical properties and cold workability of low thermal expansion Fe-33Ni-15Co sheets in the annealed and hot rolled condition was inve...The influence of 0.01% to 0. 25% of Aluminum content （in mass percent） on the mechanical properties and cold workability of low thermal expansion Fe-33Ni-15Co sheets in the annealed and hot rolled condition was investigated. Addition of Al up to 0.15 % resulted in the increase of ductility and tougianess and improvement of workability. Besides, achievement of fine grain structure and increase in the amount of annealing twins caused ductility to improve. Addition of Al higher than 0.15 % led to the increase in oxidation reaction during melting process and to refine under argon atmosphere. This caused the volume fraction of Al containing inclusions to increase and consequently the ductility and toughness to decrease.展开更多
基金We gratefully acknowledge the financial support of the Natural Science Foundation-Steel and Iron Foundation of Hebei Province(E2021203051)the Hundred Outstanding Creative Talents Projects in universities of Hebei Province,China,the Project Program of Heavy Machinery Collaborative Innovation Center,China,the Natural Science Foundation of Hubei Province(2020BED011).
文摘The twinned substructure of lenticular martensite in a quenched Fe–33Ni alloy was studied.In contrary to the traditional viewpoint that the twinned laths come from{112}<111>deformation twins and show insignificant hardening,we demonstrate that they are actually originated from the twinned Kurdjumov Sachs(KS)variants and can give rise to 3–4 times hardening up to~420 HV(~130 HV for the starting sample).The underlying mechanisms responsible for the propensity for twinned variants and the carbon-independent hardening for Fe–Ni system were discussed.
文摘The influence of 0.01% to 0. 25% of Aluminum content （in mass percent） on the mechanical properties and cold workability of low thermal expansion Fe-33Ni-15Co sheets in the annealed and hot rolled condition was investigated. Addition of Al up to 0.15 % resulted in the increase of ductility and tougianess and improvement of workability. Besides, achievement of fine grain structure and increase in the amount of annealing twins caused ductility to improve. Addition of Al higher than 0.15 % led to the increase in oxidation reaction during melting process and to refine under argon atmosphere. This caused the volume fraction of Al containing inclusions to increase and consequently the ductility and toughness to decrease.
