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0Cr15Ni5WMoVNb is a martensitic precipitation hardening stainless steel , it has good strength and toughness . Firstly, through its range of aging treatment to study the impact of aging temperature on mechanical properties . The experimental results show that , after solution treatment 0Cr15Ni5WMoVNb steel aging peak appears in the vicinity of 450 ℃ , as the aging temperature increases , the strength decreased, the toughness increased . When the temperature of 510 ° C , found little decline in the strength of steel , the toughness increased significantly . With the strength and toughness in order to pursue the best , to ensure the reliability of the process of the material used , and recommended that the material in the vicinity of 510 ℃ aging . Followed by a discussion steel retained austenite the 0Cr15Ni5WMoVNb martensitic precipitation hardening stainless steel plastic test steel retained austenite content gradually increased with the rise of aging temperature to 630 ° C retained austenite content reaches a maximum value , and after the aging temperature increases, the amount of residual austenite starts to decrease . This is mainly due to the stability of the steel austenitic at 630 ℃ highest , steel after the higher temperature aging , reduce the stability of the austenite , the austenite begins to reduce . This can be explained by the same steel having a temperature above 630 ℃ aging , the residual austenite is less than only solution heat treatment of the steel of austenite . The retained austenite steel has been able to improve the plasticity of steel on the one hand and its was flaky morphology and distribution of martensite lath boundary , on the other hand with the process of plastic deformation in the deformation induced residual austenite martensitic transformation , transformation induced plasticity related . Last cold forming properties of the steel by cold rolling simulation , on the basis of the aging temperature in the previous optimization through a series of different solution treatment to obtain an optimal solution temperature , about 1000 ° C , at this temperature solution heat treatment a cold deformation of steel recrystallization occurs , the grain is also relatively small, preferably of the strain hardening exponent n of steel highest plasticity . Through on the earlier part of the test , 0Cr15Ni5WMoVNb precipitation hardening martensitic stainless steel at 1000 ℃ solid solution with excellent mechanical properties at 510 ℃ aging treatment ; 1000 ℃ solid solution , 620 ° C aging treatment , the plasticity of steel suitable for cold forming .
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