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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[0030] Example 1:
[0031] Taking the undeformed Mn18 steel as an example, the polished metallographic surface is immersed in a volume ratio of 1:0.5:100 nitric acid (37%) + hydrochloric acid (69%) + alcohol etchant, and the erosion time is 45 seconds. Then put it into a cleaning agent of hydrochloric acid (37%) + deionized water with a volume ratio of 0.4:100, ultrasonically oscillate for 60 seconds, and blow dry with a hair dryer to prepare a metallographic sample.
[0032] The effect is illustrated in the picture figure 2 . The grain boundaries are complete and clear. In the case of little contrast between grains, there are no unshown grain boundaries, and the annealing twin grain boundaries are obvious.
Example Embodiment
[0033] Example 2:
[0034] Taking undeformed Mn25 steel as an example, the polished metallographic surface is immersed in an etchant with a volume ratio of 1.8:0.2:100 nitric acid (69%) + hydrochloric acid (37%) + alcohol, and the erosion time is 60 seconds. Then put it in a 0.2:100 hydrochloric acid (37%) + deionized water cleaning agent, ultrasonically shake for 75 seconds, and blow dry with a hair dryer to prepare a metallographic sample.
[0035] The effect is illustrated in the picture image 3 . The grain boundaries are complete and clear, with no incomplete grain boundaries, and the annealing twin grain boundaries are also very obvious.
Example Embodiment
[0036] Example 3:
[0037] Taking the deformed Mn18 steel as an example, the polished metallographic grinding surface is immersed in an etchant with a volume ratio of 3:0.4:100 nitric acid (69%) + hydrochloric acid (37%) + alcohol, and the etching time is 50 seconds. Then put it into a 0.3:100 hydrochloric acid (37%) + deionized water cleaning agent, ultrasonically vibrate for 80 seconds, and blow dry with a hair dryer to prepare a metallographic sample.
[0038] The effect is illustrated in the picture image 3 . It clearly shows that the contrast between the different grains formed by the deformation weaving structure 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 present invention to prepare TWIP steel metallographic samples has the advantages of clear structure and complete grain boundaries compared to conventional metallographic sample...
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