Effect of solid solution heat treatment process on properties of 316L austenitic stainless steel
In order to further study the effect of solution heat treatment on the properties of 316L low carbon austenitic stainless steel,the microstructure and mechanical properties of 316L stainless steel under different solution heat treatment conditions were studied by optical microscope,scanning electron microscope,transmission electron microscope and electronic universal testing machine.The results show that the strength of 316L austenitic stainless steel decreases with the increase of solution heat treat-ment temperature and solution heat treatment time in the range of 1 080-1 150 ℃ and 60-300 min,the elongation increases,the hardness value does not change much,and the impact energy shows an upuard trend with the increase of solution heat treat-ment temperature and solution heat treatment time.In 316L austenitic stainless steel,the proportion of small angle grain bounda-ries and large angle grain boundaries greater than 45° are relatively large.The large angle grain boundaries can hinder crack propagation,and the small angle grain boundaries reduce the interface energy,which has a positive effect on the strengthening of 316L austenitic stain-less steel.After solid solution heat treatment at 1 080 ℃ for 60 min,the yield strength of 316L austenitic stainless steel is 264 MPa,the tensile strength is 553 MPa,the elongation is 61％,the Brinell hardness is 141HBW and the impact energy can reach 306 J at 20 ℃,the intergranular corrosion performance is qualified,and the comprehensive performance is excellent.
316L austenitic stainless steelsolution heat treatmentmechanical propertiesrecrystallizationgrain sizegrain ori-entation distribution
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