CN106896009A - The preparation method of shaping ring sample is rolled in 42CrMo steel casting for EBSD tests - Google Patents

Abstract

The preparation method of shaping ring sample is rolled in a kind of 42CrMo steel casting for EBSD tests, belongs to ring forming process electron microscopic sample preparing technical field, it is characterised in that step is as follows：(1) cutting sample cell cube Q：Radially wall thickness direction cuts out the test specimen cell cube Q of length c=5 ~ 8mm, width k=3 ~ 4mm, height h=2 ~ 3mm in diverse location to roll over the middle part section of shaping ring short transverse in the casting of 42CrMo steel₁、Q₂、Q₃；(2) grind：On automatic grinding and polishing machine by buck to surface smoothness be 12 ~ 13 grades；(3) ultrasonic wave cleaning；(4) electrolytic polishing liquid is prepared；(5) electrobrightening：Experiment is polished using homemade electrobrightening equipment, voltage is 25 ~ 30V, and electric current is 0.6 ~ 0.8mA, and the time is 50 ~ 60s；(6) clean：It is sequentially placed into 4 ~ 5 beakers for containing a certain amount of absolute ethyl alcohol；(7) previewing：Metallography microscope Microscopic observation specimen surface by gentle erosion, may be seen indistinctly crystal boundary.Preparation method of the invention is simple, invests small, and the sample of preparation can be used for EBSD observations under ESEM and obtain clearly crystal boundary orientation mapping figure.

Description

The preparation method of shaping ring sample is rolled in 42CrMo steel casting for EBSD tests

Technical field

The invention belongs to ring forming process electron microscopic sample preparing technical field, and in particular to for EBSD tests The preparation method of shaping ring sample is rolled in the casting of 42CrMo steel.

Background technology

42CrMo steel is a kind of middle carbon and low-alloy high strength steel, with good quenching degree, plasticity and toughness and croop property, extensively The general bearing ring key bearing part for the substantial industrial such as Aero-Space, ship and defence equipment field.With medium and small profile shaft The development of carrier ring part (external diameter is less than 200mm) cold rolling technology and the hot rolling technology of large size bearing ring (more than external diameter 200mm), Because hot rolling deforms, radially wall thickness direction has very strong Anisotropic Mechanical Properties to 42CrMo steel loops base, and this is main It is relevant with the texture type formed during rolling.Therefore, using EBSD (Electron Backscatter Diffraction, EBSD) texture formation and transformation of the technical research bearing ring parts 42CrMo Steel materials during rolling, And the texture of such as recrystallization texture, shear texture and deformation texture type is disclosed as problem demanding prompt solution.

42CrMo steel samples for EBSD tests must assure that without Surface stress layer（Elastic and plastic properties stress）, flatness and Highly polished, current mechanical polishing method cannot accomplish this point, and there is long preparation period, style discrimination is low asks Topic.

The content of the invention

It is an object of the invention to provide the preparation side that shaping ring sample is rolled in a kind of 42CrMo steel casting for EBSD tests Method, can effectively solve the problems, such as prior art.

The present invention is achieved in that it is characterized in that comprising the following steps that：

(1) cutting sample cell cube Q：As shown in Figure 1, 2, shaping is rolled in the casting of 42CrMo steel using numerical control slow feeding linear cutting Radially wall thickness direction cuts out test specimen cell cube Q in diverse location in the middle part section of ring short transverse₁、Q₂、Q₃, test specimen list First body is shaped as cuboid as shown in Figure 3, the length c=5 ~ 8mm of the cuboid, width k=3 ~ 4mm, height h=2 ~ 3mm, Test specimen cell cube Q₁、Q₂、Q₃The distance of centre-to-centre spacing ring outer surface be respectively S₁=B/4、S₂=B/2、S₃=3B/4,BIt is ring Wall thickness, a diameter of 0.15mm of wire electrode for being used；

(2) grind：Sample is ground with 200#, 400#, 800#, 1200# and 2000# waterproof abrasive paper successively on automatic grinding and polishing machine, directly It it is 12 ~ 13 grades to specimen surface finish, the flow velocity for controlling water is 65 ~ 90g/min；

(3) ultrasonic wave cleaning：Sample after grinding is put into the beaker for containing absolute ethyl alcohol, 8 are cleaned using ultrasonic washing instrument ~ 12min, then quick drying；

(4) electrolytic polishing liquid is prepared：By perchloric acid HClO₄With ethanol C₂H₅OH with volume ratio be 5 ~ 8：92 ~ 95 ratio is carried out Mixing；

(5) electrobrightening：Experiment is polished using homemade simple electrobrightening equipment, as shown in figure 4, with 42CrMo steel Sample 1 is anode, is connected with the positive pole of D.C. regulated power supply 2, and the polished of 42CrMo steel curved beams 1 faces down, with stainless steel electrolytic Groove 3 is negative electrode, is connected with the negative pole of D.C. regulated power supply 2, and the electrolytic polishing liquid 4 that will be prepared is poured into stainless steel electrolytic groove 3, electricity Need to keep sample level, steady in solution preocess, stainless steel electrolytic groove 3 is placed on the working plate 5 with insulation function, electrolysis Voltage is 25 ~ 30V, and electric current is 0.6 ~ 0.8 mA, and electrolysis time is 50 ~ 60 s, and temperature is 20 ~ 30 DEG C；

(6) clean：Electrolysis is clamped sample and is sequentially placed into 4 ~ 5 beakers for containing a certain amount of absolute ethyl alcohol respectively after terminating with tweezers Middle cleaning, constantly sample is rocked in cleaning process, thoroughly removes the electrolyte of specimen surface residual, is then blown with hair-dryer cold wind Dry, being wrapped with filter paper prevents specimen surface from aoxidizing；

(7) previewing：It is in dark bright shape in metallography microscope Microscopic observation specimen surface, by gentle erosion and the crystal boundary that mays be seen indistinctly, obtains Shaping ring sample is rolled over to the 42CrMo steel casting that can be used for EBSD (EBSD) test.

Advantages of the present invention and beneficial effect are：Simple structure of the present invention, easy to operate, electrolytic polishing liquid prepares convenient, electricity Solution groove can make of stainless steel pop can, invest small, convenient material drawing, and rationally, polishing is quick, the 42CrMo steel prepared for technology Without Surface stress layer, cleaning, smooth, specimen surface is in dark bright shape to EBSD samples, by gentle erosion and the crystal boundary that mays be seen indistinctly, is such as schemed Style discrimination when constituency is observed is carried out shown in 5, under EBSD (EBSD) system installed on ESEM high, Clearly crystal boundary orientation mapping figure is obtained, as shown in Figure 6.

Brief description of the drawings

Fig. 1 is that shaping ring sizing figure is rolled in the casting of 42CrMo steel；

Fig. 2 is that 42CrMo steel test specimens cell cube samples schematic diagram；

Fig. 3 is that test specimen cell cube appearance and size identifies figure；

Fig. 4 is the schematic diagram of electrolytic buffing attachment；

Fig. 5 is the Metallograph of 42CrMo steel curved beams；

Fig. 6 is the EBSD crystal boundary orientation mapping figures of 42CrMo steel curved beams；

In figure：1-42CrMo steel curved beam 2-D.C. regulated power supply, 3-stainless steel electrolytic grooves, 4-electrolytic polishing liquid 5-absolutely Edge working plate.

1.-it is 42CrMo steel casting rolling shaping ring the upper half

2.-it is 42CrMo steel casting rolling shaping ring lower half.

Specific embodiment

The present invention is described in further details with specific embodiment below in conjunction with the accompanying drawings.

As shown in figure 1, taking ring external diameterD=320mm, ring internal diameterd=260mm, ring wall thicknessB=30mm, ring is highlyH= 50mm, processing step is as follows：

(1) cutting sample cell cube Q：As shown in Figure 1, 2, shaping is rolled in the casting of 42CrMo steel using numerical control slow feeding linear cutting Radially wall thickness direction cuts out test specimen cell cube Q in diverse location in the middle part section of ring short transverse₁、Q₂、Q₃, test specimen list First body is shaped as cuboid as shown in Figure 3, the length c=5mm of the cuboid, width k=4mm, height h=2mm, test specimen list First body Q₁、Q₂、Q₃The distance of centre-to-centre spacing ring outer surface be respectively S₁=7.5mm、S₂=15mm、S₃=22.5mm,BIt is ring Wall thickness, a diameter of 0.15mm of wire electrode for being used；

(2) grind：Ground with 200#, 400#, 800#, 1000#, 1200# and 2000# waterproof abrasive paper successively on automatic grinding and polishing machine Sample, until specimen surface finish is 13 grades, the flow velocity for controlling water is 80g/min；

(3) ultrasonic wave cleaning：Sample after grinding is put into the beaker for containing absolute ethyl alcohol, is cleaned using ultrasonic washing instrument 8min, then dries up；

(4) electrolytic polishing liquid is configured：By perchloric acid HClO₄With ethanol C₂H₅OH with volume ratio be 8：92 ratio is mixed；

(5) electrobrightening：Experiment is polished using homemade simple electrobrightening equipment, as shown in figure 4, with 42CrMo steel Sample 1 is anode, is connected with the positive pole of D.C. regulated power supply 2, and the polished of 42CrMo steel curved beams 1 faces down, with stainless steel electrolytic Groove 3 is negative electrode, is connected with the negative pole of D.C. regulated power supply 2, and the electrolytic polishing liquid 4 that will be prepared is poured into stainless steel electrolytic groove 3, electricity Need to keep sample level, steady in solution preocess, stainless steel electrolytic groove 3 is placed on the working plate 5 with insulation function, electrolysis Voltage is 30V, and electric current is 0.8mA, and electrolysis time is 60s, and temperature is 20 DEG C；

(6) clean：Electrolysis is clamped sample and is sequentially placed into 4 beakers for containing a certain amount of absolute ethyl alcohol respectively after terminating with tweezers Cleaning, constantly sample is rocked in cleaning process, thoroughly removes the electrolyte of specimen surface residual, is then blown with hair-dryer cold wind Dry, being wrapped with filter paper prevents specimen surface from aoxidizing；

(7) previewing：It is in dark bright shape in metallography microscope Microscopic observation specimen surface, by gentle erosion and the crystal boundary that mays be seen indistinctly, such as Shown in Fig. 5, shaping ring is rolled in the 42CrMo steel casting for obtaining can be used for EBSD (EBSD) test, on ESEM Carry out obtaining clearly crystal boundary orientation mapping figure when constituency is observed under the EBSD system of installation, as shown in Figure 6.

Claims (1)

1. the preparation method of shaping ring sample is rolled in the 42CrMo steel casting for being used for EBSD tests, it is characterised in that it includes following Processing step：

(1) cutting sample cell cube Q：Using numerical control slow feeding linear cutting shaping ring short transverse is rolled in the casting of 42CrMo steel Radially wall thickness direction cuts out test specimen cell cube Q in diverse location in middle part section₁、Q₂、Q₃, test specimen cell cube is shaped as Cuboid, the length c=5 ~ 8mm of the cuboid, width k=3 ~ 4mm, height h=2 ~ 3mm, test specimen cell cube Q₁、Q₂、Q₃Center Distance away from ring outer surface is respectively S₁=B/4、S₂=B/2、S₃=3B/4,BIt is the wall thickness of ring, the wire electrode diameter for being used It is 0.15mm；

(2) grind：Sample is ground with 200#, 400#, 800#, 1200# and 2000# waterproof abrasive paper successively on automatic grinding and polishing machine, directly It it is 12 ~ 13 grades to specimen surface finish, the flow velocity for controlling water is 65 ~ 90g/min；

(3) ultrasonic wave cleaning：Sample after grinding is put into the beaker for containing absolute ethyl alcohol, 8 are cleaned using ultrasonic washing instrument ~ 12min, then dries up；

(4) electrolytic polishing liquid is prepared：By perchloric acid HClO₄With ethanol C₂H₅OH with volume ratio be 5 ~ 8：92 ~ 95 ratio is carried out Mixing；

(5) electrobrightening：Experiment is polished using homemade simple electrobrightening equipment, with 42CrMo steel curved beams (1) as sun Pole, is connected with D.C. regulated power supply (2) positive pole, polished the facing down of 42CrMo steel curved beams (1), with stainless steel electrolytic groove (3) It is negative electrode, is connected with D.C. regulated power supply (2) negative pole, the electrolytic polishing liquid (4) that will be prepared pours into stainless steel electrolytic groove (3) In, needing to keep sample level, steady in electrolytic process, stainless steel electrolytic groove (3) is placed on the working plate with insulation function (5) on, decomposition voltage is 25 ~ 30V, and electric current is 0.6 ~ 0.8mA, and electrolysis time is 50 ~ 60s, and temperature is 20 ~ 30 DEG C；

(6) clean：Electrolysis is clamped sample and is sequentially placed into 4 ~ 5 beakers for containing a certain amount of absolute ethyl alcohol respectively after terminating with tweezers Middle cleaning, constantly sample is rocked in cleaning process, thoroughly removes the electrolyte of specimen surface residual, is then blown with hair-dryer cold wind Dry, being wrapped with filter paper prevents specimen surface from aoxidizing；

(7) previewing：It is in dark bright shape in metallography microscope Microscopic observation specimen surface, by gentle erosion and the crystal boundary that mays be seen indistinctly, obtains Shaping ring sample is rolled over to the 42CrMo steel casting that can be used for EBSD (EBSD) test.