304Austenitic Stainless Steel’s Low Temperature Compression Deformation Research

Because of its has good plastic toughness, excellent weldability, excellent corrosionresistance,304austenitic stainless have been widely producted and applicated by mostcountries in the world.How to make304austenitic stainless steel metal material strength,hardness and plasticity, toughness, proper matching, to provide guarantee for use for a longtime, has always been of concern to the stainless steel industry.In this paper, we test and analysis the samples’s microstructure, XRD spectrum, the truestress-strain curve and vickers hardness value through the different compression deformationtemperatureis100℃,200℃,300℃and different compression deformation rate is0.01s-1,0.1s-1,1s-1experiment.Can be concluded from the experimental result, the304austenitic stainless steel at room temperature to300℃under deformation, has the fine grainstrengthening, second phase strengthening and strain-hardening characteristics. The lowtemperature deformation of304austenitic stainless steel grain Slip, grain movement leads tothe increase of dislocation density. Due to the increase of dislocation density, the second grainboundary produced inside the original grain and grain boundary, and, in turn, for thedevelopment of grain boundary, the grain refinement. As for304austenitic stainless steel’scryogenic compression deformation,only room temperature deformation will producemartensite phase transformation, austenitic stainless steel’s microstructure transformation willnot occur at other temperatures’ deformation. Austenitic stainless’s the true stress-strain curveis of work hardening type. In the low temperature compression deformation at a certaintemperature, the greater the compression deformation rate of the austenitic stainless steel,thehigher the true stress-strain curver; In the low temperature compression deformation at acertain compression deformation rate, the lower the compression deformation temperature ofthe austenitic stainless steel, the higher the true stress-strain curve. After low temperature compression deformation of austenitic stainless steel compared with the original304austenitic stainless steel,obviously improve the strength and hardness. As for304austeniticstainless steel’s cryogenic compression deformation,at the same compression deformation rate,the lower the compression deformation temperature of the304austenitic stainless steel, thegreater the strength and hardness of austenitic stainless steel, the work hardening rate also islarger; At the same compression deformation temperature, the greater the compressiondeformation rate, the greater the strength and hardness of the304austenitic stainless steel, thework hardening rate also is larger.Choose the compression deformation temperature is100℃, compression deformationrate of1s-1for304austenitic stainless steel’s compression deformation experiment, canensure that the organization of the austenitic stainless steel is still single-phase austenitic,mechanical properties under the condition of the best. Thus for304austenitic stainless steel’splastic forming technology provides the theory basis.