TWIP (twinning induced plasticity) steel metallographic phase specimen preparation agent and use method thereof
A metallographic sample preparation and etching agent technology, applied in the field of metal materials, can solve the problems of incomplete display of grain boundaries, poor picture quality, and indistinguishability, etc., and achieve simple cleaning agents and cleaning methods, improve TW quality, and clear grain boundaries Effect
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Embodiment 1
[0031] Taking undeformed Mn18 steel as an example, immerse the polished metallographic grinding surface in a volume ratio of 1:0.5:100 nitric acid (37%)+hydrochloric acid (69%)+alcohol etchant for 45 seconds. Then put it into the cleaning agent of hydrochloric acid (37%) + deionized water with a volume ratio of 0.4:100, clean it with ultrasonic vibration for 60 seconds, and dry it with a hair dryer to make a metallographic sample.
[0032] Effect see picture description figure 2 . The grain boundaries are complete and clear. In the case of little contrast between grains, there are no undisplayed grain boundaries, and the annealing twin grain boundaries are obvious.
Embodiment 2
[0034] Taking undeformed Mn25 steel as an example, immerse the polished metallographic grinding surface in an etchant with a volume ratio of 1.8:0.2:100 nitric acid (69%)+hydrochloric acid (37%)+alcohol for 60 seconds. Then put it into the cleaning agent of hydrochloric acid (37%) + deionized water with a volume ratio of 0.2:100, clean it with ultrasonic vibration for 75 seconds, and dry it with a hair dryer to make a metallographic sample.
[0035] Effect see picture description image 3 . The grain boundary is complete and clear, and there is no incomplete grain boundary, and the annealed twin grain boundary is also very obvious.
Embodiment 3
[0037] Taking the deformed Mn18 steel as an example, immerse the polished metallographic grinding surface in an etchant with a volume ratio of 3:0.4:100 nitric acid (69%)+hydrochloric acid (37%)+alcohol for 50 seconds. Then put it into the cleaning agent of hydrochloric acid (37%)+deionized water with a volume ratio of 0.3:100, clean it with ultrasonic vibration for 80 seconds, and dry it with a hair dryer to make a metallographic sample.
[0038] Effect see picture description image 3 . It clearly shows that the contrast between different grains due to the deformation texture is increased, the grain boundaries are clear, the annealing twins can still be distinguished, and the dense deformation twins are also very clear.
[0039] Using the etchant and method of the invention to prepare TWIP steel metallographic samples has the advantages of clear structure and complete grain boundaries compared with conventional metallographic sample preparation methods. This method is also...
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