CN103454187B - A kind of method of room temperature display tempering bainite tissue's original austenite grains border - Google Patents
A kind of method of room temperature display tempering bainite tissue's original austenite grains border Download PDFInfo
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- CN103454187B CN103454187B CN201310376654.XA CN201310376654A CN103454187B CN 103454187 B CN103454187 B CN 103454187B CN 201310376654 A CN201310376654 A CN 201310376654A CN 103454187 B CN103454187 B CN 103454187B
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Abstract
The present invention relates to a kind of method for showing ferrous materials tempering bainite tissue original austenite grains degree, especially the method on a kind of room temperature display tempering bainite tissue's original austenite grains border is related to, does does the method comprise the steps sample preparation, prepare corrosive liquid, burn into grain size determination: according to prior austenite grain size display photo, according to GB/T? 6394-2002 metal mean grain size determination method is evaluated; Can be quick, accurate, reliable, easy under the inventive method uniqueness, room temperature.
Description
Technical field
The present invention relates to a kind of method for showing ferrous materials tempering bainite tissue original austenite grains degree, especially relating to the method on a kind of room temperature display tempering bainite tissue's original austenite grains border.
Background technology
The main traditional structural materials that ferrous materials uses as the mankind, its economy and the multifarious combination of performance at present any class construction material are difficult to match in excellence or beauty, and will play leading role within considerable time from now on.But also should see, the production of ferrous materials is faced with the immense pressure of the energy, resources and environment problem, is also faced with the cut-throat competition of other material simultaneously, therefore, the development trend that the intensity of ferrous materials and toughness are iron and steel technology is improved.Making ferrous materials obtain the method for high strength has multiple, and grain refinement uniquely a kind ofly can improve the best feasible method that intensity can improve again toughness, damages toughness while other method all can make the strength of materials increase.Carry out the prerequisite of grain refinement technology research, material austenite crystal border can be shown exactly, other work of how crystal grain thinning could be carried out.
At present, the method on display original austenite grains border has oxidizing process, ferrite net method, cementing process, directly etching method, but all there is certain problem when showing austenite crystal border in these methods, as: 1) oxidizing process acquisition evaluation result when measuring alloy steel is unreliable, thinner than real grain size; 2) ferrite net method, cementing process need to carry out special processing, complex process, poor practicability; 3) directly etching method needs hot bath, and sense cycle is long.
Up to the present, the method for above-mentioned defect is not also overcome.
Summary of the invention
The object of the invention is the defect overcoming prior art, the method on a kind of room temperature display tempering bainite tissue's original austenite grains border that can be quick, accurate, reliable, easy under a kind of method uniqueness, room temperature are provided.
The present invention realizes in the following way:
The method on room temperature display tempering bainite tissue's original austenite grains border, is characterized in that the method comprises the steps:
A, sample preparation: with lathe in machining φ 15mm*20mm sample, by sample through corase grind, fine grinding, polishing, make sample sightingpiston reach mirror effect, examine under a microscope surperficial no marking, water mark, foul etc.;
B, prepare corrosive liquid;
C, corrosion: the sample that above-mentioned rubbing down is good is immersed in the corrosive liquid prepared, take out after 2 minutes and first rinse with water, then use alcohol rinse, then dry up with hot-air, examine under a microscope crystal boundary;
D, grain size determination: according to prior austenite grain size display photo, evaluate according to GB/T6394-2002 metal mean grain size determination method;
The neopelex solution of the raw material of described corrosive liquid to be the supersaturation picric acid of 30ml and the concentration of 5-15ml be 8-15%, preparation method is as follows for this corrosive liquid
A, in 100ml distilled water, add picric acid and constantly stir, until picric acid no longer dissolves, falling not dissolve picric acid by filter screen filtration, then measure supersaturation picric acid 30ml;
B, take the described neopelex of 8-12g, then add water to 100ml, and be constantly stirred to dissolve fully and evenly, measure the neopelex solution of 5-15ml;
C, being 8-15% above-mentioned 5-15ml concentration, neopelex solution joins in 30ml supersaturation picric acid, and constantly stir and solution is mixed, namely corrosive liquid is prepared complete;
The method of described evaluation is picture pairing comparision, gridding method or other Quantitative metallography.
The present invention has following effect:
1) method unique, only show crystal boundary, do not show intergranular structure, Display of Grain Boundary is clear: method the method provided by the invention comprises the steps: sample preparation: with lathe in machining φ 15mm*20mm sample, by sample through corase grind, fine grinding, polishing, make sample sightingpiston reach mirror effect, examine under a microscope surperficial no marking, water mark, foul etc.; Prepare corrosive liquid; Corrosion: the sample that above-mentioned rubbing down is good is immersed in the corrosive liquid prepared, takes out after 2 minutes and first rinses with water, then use alcohol rinse, then dry up with hot-air, examine under a microscope crystal boundary; Grain size determination: according to prior austenite grain size display photo, evaluate according to GB/T6394-2002 metal mean grain size determination method; , the method for display original austenite crystal boundary provided by the invention only shows crystal boundary, and do not show intergranular structure, Display of Grain Boundary is clear.
2) method provided by the invention is without the process such as high temperature, heating, and on the austenite crystal of sample without impact, the crystal boundary observed belongs to original austenite crystal boundary, can detect referee method as tempering bainite tissue's grain size.
3) method of display original austenite crystal boundary provided by the invention is simple to operate, does not need hot bath, shortens grain size detection time, significantly improves the efficiency that grain size detects.
Embodiment
The method on room temperature display tempering bainite tissue's original austenite grains border, is characterized in that: the method comprises the steps:
A, sample preparation: with lathe in machining φ 15mm*20mm sample, this size is the specimen size with reference to recommending in Metallographic standard GB/T13298, by sample through corase grind, fine grinding, polishing, make sample sightingpiston reach mirror effect, examine under a microscope surperficial no marking, water mark, foul etc.;
B, prepare corrosive liquid;
C, corrosion: the sample that above-mentioned rubbing down is good is immersed in the corrosive liquid prepared, take out after 2 minutes and first rinse with water, then use alcohol rinse, then dry up with hot-air, examine under a microscope crystal boundary;
D, grain size determination: according to prior austenite grain size display photo, evaluate according to GB/T6394-2002 metal mean grain size determination method.
The neopelex solution of the raw material of described corrosive liquid to be the supersaturation picric acid of 30ml and the concentration of 5-15ml be 8-15%, preparation method is as follows for this corrosive liquid
A, in 100ml distilled water, add picric acid and constantly stir, until picric acid no longer dissolves, falling not dissolve picric acid by filter screen filtration, then measure supersaturation picric acid 30ml;
B, take the described neopelex of 8-12g, then add water to 100ml, and be constantly stirred to dissolve fully and evenly, measure the neopelex solution of 5-15ml;
C, being 8-15% above-mentioned 5-15ml concentration, neopelex solution joins in 30ml supersaturation picric acid, and constantly stir and solution is mixed, namely corrosive liquid is prepared complete.
The method of described evaluation is picture pairing comparision, gridding method or other Quantitative metallography.
Claims (1)
1. the method on room temperature display tempering bainite tissue's original austenite grains border, is characterized in that: the method comprises the steps:
A, sample preparation: with lathe in machining φ 15mm*20mm sample, by sample through corase grind, fine grinding, polishing, make sample sightingpiston reach mirror effect, examine under a microscope surperficial no marking, water mark, foul;
B, prepare corrosive liquid;
C, corrosion: the sample that above-mentioned rubbing down is good is immersed in the corrosive liquid prepared, take out after 2 minutes and first rinse with water, then use alcohol rinse, then dry up with hot-air, examine under a microscope crystal boundary;
D, grain size determination: according to prior austenite grain size display photo, evaluate according to GB/T6394-2002 metal mean grain size determination method, the neopelex solution of the raw material of described corrosive liquid to be the supersaturation picric acid of 30ml and the concentration of 5-15ml be 8-15%, preparation method is as follows for this corrosive liquid
1) in 100ml distilled water, add picric acid and constantly stir, until picric acid no longer dissolves, falling not dissolve picric acid by filter screen filtration, then measure supersaturation picric acid 30ml;
2) take the described neopelex of 8-12g, then add water to 100ml, and be constantly stirred to dissolve abundant and evenly, measure the neopelex solution of 5-15ml;
3) the neopelex solution being 8-15% above-mentioned 5-15ml concentration joins in 30ml supersaturation picric acid, and constantly stir and solution is mixed, namely corrosive liquid is prepared complete; The method of described evaluation is picture pairing comparision, gridding method or other Quantitative metallography.
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| CN103938149A (en) * | 2014-04-11 | 2014-07-23 | 人本集团有限公司 | Metallographic detection sample preparation method after carbonitriding of high-carbon chromium bearing steel, as well as product |
| CN103983502A (en) * | 2014-06-10 | 2014-08-13 | 上海电气电站设备有限公司 | Metallographic corrosion method for clearly displaying 9-12% Cr heat-resistant steel original austenite grain boundary |
| CN104729963B (en) * | 2015-03-31 | 2017-08-08 | 常州天山重工机械有限公司 | A kind of detection display methods of the austenite crystal of room temperature lower gear quenched and tempered steel |
| CN105547796A (en) * | 2015-12-21 | 2016-05-04 | 中车戚墅堰机车车辆工艺研究所有限公司 | A metallographic phase corrosive used for displaying a tempered sorbite tissue austenite crystal boundary and a corroding method |
| CN106370499A (en) * | 2016-08-25 | 2017-02-01 | 鹰普（中国）有限公司 | Austenite crystal boundary corrosion method after carburizing and quenching |
| CN107202790A (en) * | 2017-06-13 | 2017-09-26 | 南通市产品质量监督检验所 | A kind of high-carbon steel wire rod tissue grain size ranking method |
| CN109187151A (en) * | 2018-08-22 | 2019-01-11 | 内蒙古第机械集团股份有限公司 | A kind of corrosive agent showing spring steel prior austenite grain size |
| CN109540636A (en) * | 2018-12-11 | 2019-03-29 | 渤海造船厂集团有限公司 | A kind of low medium alloy steel original austenite Display of Grain Boundary method of quenched and tempered state |
| CN110118779A (en) * | 2019-05-13 | 2019-08-13 | 中天钢铁集团有限公司 | A kind of the dendrite corrosive agent and display methods of the heat resisting steel containing chromium |
| CN111206248A (en) * | 2020-01-16 | 2020-05-29 | 中国第一汽车股份有限公司 | Preparation and corrosion method of corrosive agent for displaying original austenite grain size of 42CrMo forge piece |
| CN112195471A (en) * | 2020-09-16 | 2021-01-08 | 上海交通大学 | Corrosive agent for lath martensite steel original austenite grain boundary, preparation method and corrosion method |
| CN113740131B (en) * | 2021-09-07 | 2023-05-30 | 攀钢集团攀枝花钢铁研究院有限公司 | Grain boundary display method of bainitic steel |
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Address after: 750021 Tongxin Street 199, Xixia District, Yinchuan, the Ningxia Hui Autonomous Region Patentee after: KOCEL GROUP LIMITED Address before: 750021 Tongxin Street 199, Xixia District, Yinchuan, the Ningxia Hui Autonomous Region Patentee before: Ningxia Gongxiang Group Co., Ltd. |
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Effective date of registration: 20190508 Address after: 750021 Tongxin Street 199, Xixia District, Yinchuan, the Ningxia Hui Autonomous Region Patentee after: KOCEL EQUIPMENT CO., LTD. Address before: 750021 Tongxin Street 199, Xixia District, Yinchuan, the Ningxia Hui Autonomous Region Patentee before: KOCEL GROUP LIMITED |