CN101717847B - Mechanical impacting and hardening method for processing high manganese steel frog - Google Patents
Mechanical impacting and hardening method for processing high manganese steel frog Download PDFInfo
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- CN101717847B CN101717847B CN2009102278608A CN200910227860A CN101717847B CN 101717847 B CN101717847 B CN 101717847B CN 2009102278608 A CN2009102278608 A CN 2009102278608A CN 200910227860 A CN200910227860 A CN 200910227860A CN 101717847 B CN101717847 B CN 101717847B
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Abstract
The invention relates to a mechanical impacting and hardening method for processing a high manganese steel frog. The method mainly comprises the following steps: heating the high manganese steel frog to 1050-1100 DEGC, carrying out water quenching after heat is preserved for 2-4 hours, heating the surface of the high manganese steel frog to be 280-320 DEGC, and impacting the working surface of the high manganese steel frog by adopting a pneumatic pick with the impact energy of 50- 100J and the impacting frequency of 15- 20 Hz; and the pressure stress of an impact head and the surface of the frog is 5-10 MPa, and the impacting and hardening processing time of each processing point is 10- 30 seconds. The distance among edges of each impacting and hardening point area is less than 5 mm. The surface hardness of the high manganese steel frog processed by the mechanical impacting and hardening treatment is 470- 520 HB, the depth of a hardened layer is more than 10 mm, the service life of the high manganese steel frog can be increased by more than 60 percents, and the method has the advantages of simple process, safe production and extremely low cost.
Description
Technical field the present invention relates to the high manganese steel frog surface hardening process that uses on a kind of working method of metallic substance, particularly rail track.
Background technology high mangaenese steel is because its excellent work hardening ability, higher intensity and toughness since 19 end of the centurys, just are used for making the key part-railway frog of rail track always.At present, be 1.4～1.5 hundred million tons the mean life (in overload quantity) of the common High Manganese Steel Frog that China makes, and reach more than 200,000,000 tons the work-ing life of the common High Manganese Steel Frog that countries such as US and European make.Along with the raising of transportation by railroad speed, require further to improve the work-ing life and the safety performance of railway frog.The failure mode of High Manganese Steel Frog is to use wearing and tearing and the conquassation and the fatigue in use later stage at initial stage and peels off.It is at the use initial stage, because the not effectively performance of its excellent work hardening ability, the low wear resistance of intensity is relatively poor, is subjected to the impact of high speed wheel and the generation early of rubbing effect frog surface than heavy wear with viscous deformation conquassation phenomenon occurs.Therefore, for improving the wear-resistant and non-deformability of initial stage of railway frog, people begin one's study and use the surface to carry out the pre-hardening processing to High Manganese Steel Frog.Common material surface pre-hardening treatment process mainly contains shot-peening and blast or the like, and shot-peening makes more shallow its DeGrain of the hardened layer of high mangaenese steel, does not satisfy the service requirements of railroad frog service condition, is not used in the actual production.Explosion hardening can make high manganese steel frog surface obtain moderate surface hardness and the bigger hardening effect of the degree of depth, so explosion hardening technological method treatment process is widely used in the High Manganese Steel Frog pre-hardening production.Yet explosion hardening has tangible deficiency, and the first, explosion hardening technology utilize powerful explosive to realize, cause the explosion hardening poor stability; It two is that explosion hardening is handled and to be needed specialized facilities, and uses a large amount of explosives, and cost is higher; It three is that explosion hardening is handled and the inherent castability of High Manganese Steel Frog to be required high, if there are casting flaws such as slag inclusion and pore in frog surface inside, crackle can occur or subsides through the explosive treatment rear surface, and the serious railway frog that makes is scrapped.
Summary of the invention the object of the present invention is to provide that a kind of technology is simple, safety, flexibly, cost is low and the inner quality of railway frog is required low mechanical impacting and hardening method for processing high manganese steel frog.The present invention mainly is under heating condition, adopts pneumatic pick that high manganese steel frog surface is carried out mechanical impacting and hardening and handles.
Technical scheme of the present invention is:
1, solution treatment: High Manganese Steel Frog will carry out solution treatment before shock treatment, promptly be heated to 1050～1100 ℃, the insulation 2～4h after shrend, to obtain single-phase austenite structure.
2, surface heat is handled: utilize intermediate frequency or flame heating method, high manganese steel frog surface is heated to 280～320 ℃, it can effectively guarantee to obtain the desirable hardening effect that surface hardness is moderate, hardening depth is darker.Shock peening is handled back High Manganese Steel Frog naturally cooling in air.
3, shock treatment: adopt pneumatic pick to impact above-mentioned High Manganese Steel Frog working-surface, comprising heart rail and wing rail part position, its hardening treatment area determines that as required generally shock peening is handled position darker regions as shown in Figure 1.When mechanical shock was handled, the impact energy of pneumatic pick was 50～100J, and frequency of impact is 15～20HZ, and the stress of impact head and frog surface is 5～10MPa, and the shock peening treatment time of each process points is 10～30s.The shape of each shock peening point can be various, and as circular, square or Polygons, but the distance at the edge in each hard point district should be less than 5mm.
The present invention has excellent cold working hardening characteristic by high mangaenese steel, utilize the energy that impacts generation to make frog surface produce viscous deformation, thereby obtain to use the part top layer to have higher hardness, the High Manganese Steel Frog that has big case depth simultaneously, with the initial antiwear property and the plasticity_resistant deformation ability of raising High Manganese Steel Frog, thus the work-ing life of improving High Manganese Steel Frog.
The present invention compared with prior art has following advantage:
1, High Manganese Steel Frog is handled rear surface sublayer tissue through shock peening and is produced tangible viscous deformation, as shown in Figure 2, thereby produce tangible drawing hardening effect, the frogger reaches 470-520HB, case depth as surface hardness and reaches the above ideal hardening effect that satisfies the railroad frog working conditions of 10mm, as shown in Figure 3.
2, mechanical impacting and hardening is handled is improved more than 60% the work-ing life of High Manganese Steel Frog, and the increase rate in work-ing life is higher than that present widely used High Manganese Steel Frog explosion hardening technology can reach.
3, this High Manganese Steel Frog hardening technique, hardening effect is good, technology is simple, production safety, cost extremely low (almost zero cost), this be any other High Manganese Steel Frog hardening technique can't be obtained.
Description of drawings
Fig. 1 is that the High Manganese Steel Frog mechanical impacting and hardening is handled position view;
Fig. 2 is the microstructure of high manganese steel frog surface sublayer behind the mechanical impacting and hardening;
Fig. 3 is that the High Manganese Steel Frog mechanical impacting and hardening is handled back sublayer hardness distribution.
Among Fig. 1,1-heart rail, 2-wing rail.
Among Fig. 2, the black bar of austenite crystal inside is the distortion slip band, illustrates through mechanical shock high mangaenese steel austenite structure to produce tangible viscous deformation.
Embodiment
Treat that it is (wt-%): C 1.21 that shock peening is handled the concrete chemical ingredients of high mangaenese steel for one, Mn 13.4, and Si 0.51, and P 0.042; S 0.033, and all the other are Fe.The size of high mangaenese steel test specimen is that thickness is that 30mm, area are the steel plate of 200 * 200mm, its solution treatment for be heated to 1050 ℃ the insulation 2h after shrend, obtain single-phase austenite structure.The high mangaenese steel specimen surface is heated to 290 ℃, adopt pneumatic pick to impact above-mentioned high mangaenese steel test specimen surface, when mechanical shock is handled, the pressure on impact head and high mangaenese steel surface is 6MPa, the impact energy of pneumatic pick is 60J, frequency of impact is 19HZ, and the shock peening treatment time of each process object point is 15s, and each hard point Edge Distance is 2mm.Shock peening is handled back High Manganese Steel Frog naturally cooling in air.Surface hardness through the High Manganese Steel Frog of this processing is 490HB, and case depth is 12mm.It is more smooth to impact the back specimen surface, and the phenomenon that does not have the part to stay, the difference of altitude of surperficial vertex and lower-most point are 0.5mm.
Concrete chemical ingredients by the High Manganese Steel Frog that shock peening is handled is (wt-%): C 1.13, Mn13.1, and Si 0.51, and P 0.043, and S 0.028, and all the other are Fe.The solution heat treatment of this High Manganese Steel Frog for be heated to 1080 ℃ the insulation 4h after shrend, obtain single-phase austenite structure.The High Manganese Steel Frog hardened surface is heated to 310 ℃, adopt pneumatic pick to impact above-mentioned high mangaenese steel test specimen surface, when mechanical shock is handled, the pressure of impact head and frog surface is 9MPa, the impact energy of pneumatic pick is 90J, and frequency of impact is 19HZ, and the shock peening treatment time of each process object point is 20s, the distance at each sclerosis edge is 4mm, and shock peening is handled back High Manganese Steel Frog naturally cooling in air.Surface hardness through this ballistic High Manganese Steel Frog is 510HB, and case depth is 18mm, and it is more smooth to impact the back frog surface, the phenomenon that does not have obvious part to stay.This High Manganese Steel Frog carries out practical probation on rail track, and in operational process, carried out tracking and testing, through estimating to reach 2.6 hundred million tons of total overload quantities the work-ing life of this railway frog of test analysis, than not improving more than 60% the work-ing life of the homogenous quantities High Manganese Steel Frog of process mechanical impacting and hardening.
Claims (2)
1. mechanical impacting and hardening method for processing high manganese steel frog is characterized in that:
(1) High Manganese Steel Frog is heated to 1050～1100 ℃, the insulation 2～4h after shrend,
(2) high manganese steel frog surface is heated to 280～320 ℃,
(3) adopt pneumatic pick to impact above-mentioned High Manganese Steel Frog working-surface, the impact energy of pneumatic pick is 50～100J, and frequency of impact is 15～20HZ, and the stress of impact head and frog surface is 5～10MPa, and the shock peening treatment time of each process points is 10～30s.
(4) after the High Manganese Steel Frog shock peening is handled, air cooling.
2. mechanical impacting and hardening method for processing high manganese steel frog according to claim 1 is characterized in that: the distance at the edge in each shock peening point district is less than 5mm.
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| Application Number | Priority Date | Filing Date | Title |
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| CN2009102278608A CN101717847B (en) | 2009-12-24 | 2009-12-24 | Mechanical impacting and hardening method for processing high manganese steel frog |
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| CN2009102278608A CN101717847B (en) | 2009-12-24 | 2009-12-24 | Mechanical impacting and hardening method for processing high manganese steel frog |
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| CN101717847A CN101717847A (en) | 2010-06-02 |
| CN101717847B true CN101717847B (en) | 2011-06-15 |
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| CN2009102278608A Expired - Fee Related CN101717847B (en) | 2009-12-24 | 2009-12-24 | Mechanical impacting and hardening method for processing high manganese steel frog |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN102212819B (en) * | 2011-05-27 | 2012-07-25 | 燕山大学 | Method for preparing surface aluminium-based composite material by impacting heavily and repetitively at high speed |
| CN108251627B (en) * | 2018-02-05 | 2019-08-27 | 燕山大学 | One kind carrying out local deformation heat treatment method to casting high manganese steel frog |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5366568A (en) * | 1993-10-13 | 1994-11-22 | Bruce Douglas G | Method of producing primarily tempered martensite steel |
| CN1515743A (en) * | 2003-01-03 | 2004-07-28 | 张准胜 | Laser intensified railroad switch |
| CN2895505Y (en) * | 2006-04-20 | 2007-05-02 | 关铁 | Inlaid-alloy type wing rail |
| CN100999781A (en) * | 2007-01-13 | 2007-07-18 | 燕山大学 | High manganese steel frog surface explosive harden tech. |
| CN101323891A (en) * | 2008-07-08 | 2008-12-17 | 燕山大学 | Manufacturing method of pure high manganese steel cross frog |
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2009
- 2009-12-24 CN CN2009102278608A patent/CN101717847B/en not_active Expired - Fee Related
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5366568A (en) * | 1993-10-13 | 1994-11-22 | Bruce Douglas G | Method of producing primarily tempered martensite steel |
| CN1515743A (en) * | 2003-01-03 | 2004-07-28 | 张准胜 | Laser intensified railroad switch |
| CN2895505Y (en) * | 2006-04-20 | 2007-05-02 | 关铁 | Inlaid-alloy type wing rail |
| CN100999781A (en) * | 2007-01-13 | 2007-07-18 | 燕山大学 | High manganese steel frog surface explosive harden tech. |
| CN101323891A (en) * | 2008-07-08 | 2008-12-17 | 燕山大学 | Manufacturing method of pure high manganese steel cross frog |
Non-Patent Citations (1)
| Title |
|---|
| 张福成等.***硬化ZGMn13Cu2NV钢辙叉的组织和性能.《机械工程学报》.2008,第44卷(第6期), * |
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