Formability of Stainless Steel and Performance Evaluation
Formability of stainless steel because of the different crystalline structure that is different and very different. Such as ferrite stainless steel and austenitic stainless steel forming property is the former body-centered cubic crystal structure, while the latter is the face-centered cubic crystal structure were significantly different.
Ferritic stainless steel flange formability and n value (work-hardening is related to deep drawing processing performance and the r value (the plastic should change) related. Where r values from different production processes of different organizations under the collection to decide. Take some measures to significantly reduce the solid solution of carbon and nitrogen solution, and to greatly improve the r value of the deep drawing performance significantly improved.
Austenitic stainless steel in general n is large, during the course of processing the generated plastic induced martensite phase change, and thus have greater value and elongation of n, can be deep-drawing process and flanging. Some austenitic stainless steel in deep drawing process, after a period of time will produce stamping direction consistent with the longitudinal cracks, the so-called "time crack." This high nickel, low nitrogen and low-carbon austenitic stainless steel to avoid the occurrence of the defect.
Austenitic stainless steel of nickel contained in steel can reduce the tendency of cold hardening, the reason is the stability of austenite can increase, decrease or eliminate the cold martensite transformation in the process, reducing the cold work hardening rate, reduces the strength and ductility increase.
Increase in the duplex nickel content stainless steel martensitic transition temperature can be reduced, thereby improving the performance of cold deformation.
In the evaluation of stainless steel forming, generally, to mark the Composite forming properties. The complex forming properties is a sign of resistance to fracture and fracture limit (deep-drawing performance, flange forming property, extending the performance edge, bending performance), signs and materials with the forming die of the anti-wrinkle resistance, marking fixed after unloading shape of the shape of the fixed and so on.
Stainless steel plate on the performance evaluation of the process have the following test methods:
(1) tensile test;
(2) Bending test;
(3) Forming test;
(4) expanding test;
(5) impact test.
The process of stainless steel pipe to evaluate the performance are the following:
(1) Tensile test
(2) expansion of pipe test
(3) The flattening test
(4) crushing test
(5) Bending test
Related References:
1. Free Machining Stainless Steel
2. Machinability Table of Metals
3. Machining Stainless Steel Tool Geometry
4. Machining Machinability of Stainless Steel
5. General Principles of Machining Stainless Steel
6. Influence of Stainless Steel on Machinability
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