CN107907566A - A kind of test method for predicting metal material laser hardening depth - Google Patents

A kind of test method for predicting metal material laser hardening depth Download PDF

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Publication number
CN107907566A
CN107907566A CN201711309711.7A CN201711309711A CN107907566A CN 107907566 A CN107907566 A CN 107907566A CN 201711309711 A CN201711309711 A CN 201711309711A CN 107907566 A CN107907566 A CN 107907566A
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CN
China
Prior art keywords
metal material
detection zone
hardening depth
zone
standard specimen
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Pending
Application number
CN201711309711.7A
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Chinese (zh)
Inventor
梁鹏
李必强
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Sinosteel Xingtai Machinery and Mill Roll Co Ltd
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Sinosteel Xingtai Machinery and Mill Roll Co Ltd
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Application filed by Sinosteel Xingtai Machinery and Mill Roll Co Ltd filed Critical Sinosteel Xingtai Machinery and Mill Roll Co Ltd
Priority to CN201711309711.7A priority Critical patent/CN107907566A/en
Publication of CN107907566A publication Critical patent/CN107907566A/en
Pending legal-status Critical Current

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Classifications

    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N25/00—Investigating or analyzing materials by the use of thermal means
    • G01N25/20—Investigating or analyzing materials by the use of thermal means by investigating the development of heat, i.e. calorimetry, e.g. by measuring specific heat, by measuring thermal conductivity
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
    • C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
    • C21D1/06—Surface hardening
    • C21D1/09—Surface hardening by direct application of electrical or wave energy; by particle radiation

Abstract

The invention discloses a kind of test method for predicting metal material laser hardening depth, belong to metal material field, standard specimen is made first, multiple thermocouples are welded in the detection zone of standard specimen, the heating zone of standard specimen is heated, records the temperature of each thermocouple, draw temperature curve, metal material temperature field is calculated, with reference to metal material transformation temperature itself, predicts laser hardening depth.Prediction result of the present invention is accurate, has very strong directive significance for laser production.

Description

A kind of test method for predicting metal material laser hardening depth
Technical field
The present invention relates to metal material field, especially a kind of test method for predicting metal material laser hardening depth.
Background technology
Laser quenching is heated the material to more than transformation temperature using laser, as material itself cools down, austenite transformation For martensite, so that the quenching technology of material surface hardened, is a kind of common heat treatment method.Influence metal laser quenching Factor it is very much, and wherein laser quenching formed temperature field be one of key factor, the temperature field of laser quenching is wider, material Transformation temperature it is lower, the depth of quenching is deeper.And with the extensive of laser quenching application, it is necessary to more and more new metal materials The laser hardening depth of material is predicted, and verification laser technology disclosure satisfy that requirement.
The content of the invention
The technical problem to be solved in the invention is to provide a kind of test method for predicting metal material laser hardening depth, Prediction result is accurate, has very strong directive significance for laser production.
In order to solve the above technical problems, the technical solution adopted in the present invention is：
A kind of test method for predicting metal material laser hardening depth, makes standard specimen, in standard specimen first Detection zone welds multiple thermocouples, and the heating zone of standard specimen is heated, records the temperature of each thermocouple, it is bent to draw temperature Line, calculates metal material temperature field, with reference to metal material transformation temperature itself, predicts laser hardening depth.
Technical solution of the present invention further improvement lies in that：Comprise the following steps
A, makes standard specimen, and standard specimen is divided into heating zone and detection zone；
B, welds multiple thermocouples in detection zone；
C, carries out using laser heating zone to be heated to 1000 DEG C；
D, waits 10s, records the temperature of each thermocouple, and draw temperature curve；
E, according to temperature curve, with reference to metal material transformation temperature itself, predicts laser hardening depth.
Technical solution of the present invention further improvement lies in that：The standard specimen includes integrally formed square heating Area and rectangular detection zone, standard specimen thickness are 10mm, heating zone 30*30mm, detection zone 50*5mm, heating zone its In it is corresponding with the short side middle part of detection zone in the middle part of side.
Technical solution of the present invention further improvement lies in that：A 20* is formed on heating zone during the laser heating The hot spot of 20mm, heats 20*20mm regions, and spot area is in contact with detection zone, in a side of spot area Portion is corresponding with the middle part of detection zone short side.
Technical solution of the present invention further improvement lies in that：The detection zone middle-range heating zone and detection zone intersection 1mm, One thermocouple of each setting at 3mm and 5mm.
By adopting the above-described technical solution, the technological progress that the present invention obtains is：
Prediction result of the present invention is accurate, has very strong directive significance for laser production.The present invention can predict a certain The laser hardening depth of laser-quenching technique, judges that can laser hardening depth meet technical requirements；Judge a certain new material Limit hardening depth, and then select to be more advantageous to the metal material of laser quenching.And heating process is similar with laser quenching process, Further ensure that prediction result is accurate.
Brief description of the drawings
Fig. 1 is temperature profile of the present invention.
Embodiment
The present invention is described in further details with reference to embodiment：
A kind of test method for predicting metal material laser hardening depth, makes standard specimen, in standard specimen first Detection zone welds multiple thermocouples, and the heating zone of standard specimen is heated, records the temperature of each thermocouple, it is bent to draw temperature Line, calculates metal material temperature field, with reference to metal material transformation temperature itself, predicts laser hardening depth.
Specifically include following steps
A, makes standard specimen, and standard specimen is divided into heating zone and detection zone；
Standard specimen includes integrally formed square heating zone and rectangular detection zone, and standard specimen thickness is 10mm, heating zone 30*30mm, detection zone 50*5mm, the one of side middle part in heating zone and the short side middle part of detection zone are right Should.
B, welds multiple thermocouples in detection zone；
Detection zone middle-range heating zone and one thermocouple of each setting at detection zone intersection 1mm, 3mm and 5mm.
C, using laser be heated to 1000 DEG C (suitably being adjusted according to the transformation temperature of metal material) to heating zone；
The hot spot of a 20*20mm is formed when laser heats on heating zone, 20*20mm regions are heated, hot spot Region is in contact with detection zone, and the middle part on a side of spot area is corresponding with the middle part of detection zone short side.
D, waits 10s, records the temperature of each thermocouple, and draws temperature curve, sees Fig. 1；
Temperature-time graph (temperature unit DEG C) of standard specimen
1s 2s 3s 4s 5s 6s 7s 8s 9s 10s
At 1mm 890 912 930 939 947 952 956 959 961 963
At 3mm 493 642 706 748 777 799 816 829 840 849
At 5mm 282 437 513 563 600 629 651 670 686 700
E, according to temperature curve, with reference to metal material transformation temperature itself, predicts laser hardening depth.
The hardening heat of the known material is about 920 DEG C, at depth 1mm, during T (temperature) >=920 DEG C, can just be hardened Meet the requirements.During t (time)=2s, T=912 DEG C, during t=3s, T=930 DEG C, when drawing t=2.5s, 921 DEG C of T ≈.Therefore, During 1000 DEG C of hardening heat, it is to be ensured that laser quenching depth >=1mm, at least needs to keep the temperature 2.5s, for spot width 10mm's Laser, then need to set laser scanning speed≤4mm/s.
For the metal material workpiece, using 10mm width hot spots, sweep speed 4mm/s, 1000 DEG C of hardening heat, carries out Laser quenching, dissects workpiece and detects, find depth of hardening zone 0.9mm, approached with prediction result after quenching.
During 1000 DEG C of hardening heat, 10s is kept the temperature, at depth 1mm, T=963 DEG C, at depth 3mm, T=849 DEG C, therefore push away Calculate at depth 1.75mm, 920 DEG C of T ≈, therefore under this quenching condition, metal material limit hardening depth 1.75mm.If Want to improve hardening depth, it is necessary to improve hardening heat, improve soaking time or more conversion materials.
For the metal material workpiece, using 10mm width hot spots, sweep speed 1mm/s, 1000 DEG C of hardening heat, carries out Laser quenching, dissects workpiece and detects, find depth of hardening zone 1.72mm, approached with prediction result after quenching.
Prediction result of the present invention is accurate, has very strong directive significance for laser production.The present invention can predict a certain The laser hardening depth of laser-quenching technique, judges that can laser hardening depth meet technical requirements；Judge a certain new material Limit hardening depth, and then select to be more advantageous to the metal material of laser quenching.Experiment process is similar with laser quenching process, into One step ensures that prediction result is accurate.

Claims (5)

  1. A kind of 1. test method for predicting metal material laser hardening depth, it is characterised in that：Standard specimen is made first, is being marked The detection zone of quasi- sample welds multiple thermocouples, and the heating zone of standard specimen is heated, the temperature of each thermocouple is recorded, paints Temperature curve processed, calculates metal material temperature field, with reference to metal material transformation temperature itself, predicts laser hardening depth.
  2. A kind of 2. test method for predicting metal material laser hardening depth according to claim 1, it is characterised in that bag Include following steps
    A, makes standard specimen, and standard specimen is divided into heating zone and detection zone；
    B, welds multiple thermocouples in detection zone；
    C, carries out using laser heating zone to be heated to 1000 DEG C；
    D, waits 10s, records the temperature of each thermocouple, and draw temperature curve；
    E, according to temperature curve, with reference to metal material transformation temperature itself, predicts laser hardening depth.
  3. A kind of 3. test method for predicting metal material laser hardening depth according to claim 1, it is characterised in that：Institute Stating standard specimen includes integrally formed square heating zone and rectangular detection zone, and standard specimen thickness is 10mm, is added Hot-zone is 30*30mm, detection zone 50*5mm, corresponding with the short side middle part of detection zone in the middle part of the one of side in heating zone.
  4. A kind of 4. test method for predicting metal material laser hardening depth according to claim 3, it is characterised in that：Institute State laser heating when on heating zone formed a 20*20mm hot spot, 20*20mm regions are heated, spot area with Detection zone is in contact, and the middle part on a side of spot area is corresponding with the middle part of detection zone short side.
  5. A kind of 5. test method for predicting metal material laser hardening depth according to claim 3, it is characterised in that：Institute State detection zone middle-range heating zone and one thermocouple of each setting at detection zone intersection 1mm, 3mm and 5mm.
CN201711309711.7A 2017-12-11 2017-12-11 A kind of test method for predicting metal material laser hardening depth Pending CN107907566A (en)

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Application Number Priority Date Filing Date Title
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Application publication date: 20180413