CN108562482A - A kind of process that the Thermal Fatigue Damage of stainless steel soldered fitting measures - Google Patents
A kind of process that the Thermal Fatigue Damage of stainless steel soldered fitting measures Download PDFInfo
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- CN108562482A CN108562482A CN201810370316.8A CN201810370316A CN108562482A CN 108562482 A CN108562482 A CN 108562482A CN 201810370316 A CN201810370316 A CN 201810370316A CN 108562482 A CN108562482 A CN 108562482A
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- stainless steel
- soldered fitting
- temperature
- steel soldered
- thermal fatigue
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N3/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N3/02—Details
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N3/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N3/60—Investigating resistance of materials, e.g. refractory materials, to rapid heat changes
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Abstract
The invention discloses a kind of thermal fatigue property test methods of stainless steel soldered fitting, include the following steps：1）The circular hole of an a diameter of 2 ~ 3mm is bored at 10 ~ 20mm of brazed seam so as to fit being suspended on the fixture of thermal fatigue tester in stainless steel soldered fitting upper end；2）A K is connected at the brazed seam of stainless steel soldered fitting fills thermocouple, furnace temperature is set as 500 ~ 550 DEG C, the real-time temperature values of sample during test heats up with stove, 450 ~ 550 DEG C of temperature of reaching the standard grade are respectively 180 ~ 200s and 20 ~ 30s with the time of heating and water cooling needed for 15 ~ 25 DEG C of offline temperature；3）Different fatigue life cycles is set, sample reciprocation cycle in bound temperature range is made；4）It is recycling in certain number, is measuring the length of stainless steel soldered fitting face crack.
Description
Technical field
The present invention relates to the researchs of metal material thermal fatigue property, tired more particularly to a kind of heat of stainless steel soldered fitting
The process that strain wound measures, the more particularly to work that the Thermal Fatigue Damage of W-Cu/1Cr18Ni9 stainless steels soldered fitting measures
Process.
Background technology
W-Cu/1Cr18Ni9 stainless steel soldered fittings usually bear thermal force, and thermal fatigue life is the important of soldered fitting
Performance indicator.HB6660-1992 used at present《Sheet metal thermal fatigue test method》, Uniform provisions ceiling temperature is under
The heating and cooling time for limiting temperature are respectively 55s and 5s, and the size of sample is defined as a length of 50mm, width 20mm.And W-
Requirement as defined in it is not achieved in the smallclothes size of Cu/1Cr18Ni9 stainless steel soldered fittings, and within the time of heating 55s,
Temperature that specimen temperature did not reached requirement reach the standard grade can make W-Cu composite woods if reaching ceiling temperature by improving furnace temperature
Material, which generates oxidation, influences the use of sample, and there is presently no one kind to be suitable for testing W-Cu/1Cr18Ni9 stainless steel soldered fittings
The method of thermal fatigue property.
Invention content
Goal of the invention：Of the existing technology in order to solve the problems, such as, technical problem to be solved by the invention is to provide one
The test method of kind stainless steel soldered fitting thermal fatigue property.Specifically provide a kind of stainless steel soldered fitting W-Cu/
The test method of 1Cr18Ni9 thermal fatigue properties.
Technical solution：To achieve the goals above, present invention technical solution to be taken is as follows：The present invention provides one
The thermal fatigue property test method of kind stainless steel soldered fitting, includes the following steps：
1) circular hole for boring an a diameter of 2~3mm at 10~20mm of brazed seam in stainless steel soldered fitting upper end keeps it suitable
Conjunction is suspended on the fixture of thermal fatigue tester；
2) K is connected at the brazed seam of stainless steel soldered fitting and fill thermocouple, set furnace temperature as 500~550 DEG C, test
The real-time temperature values of sample during heating up with stove, 450~550 DEG C of temperature of reaching the standard grade are heated with needed for 15~25 DEG C of offline temperature
Time with water cooling is respectively 180~200s and 20~30s；
3) different fatigue life cycles is set, sample reciprocation cycle in bound temperature range is made；
4) it is recycling in certain number, is measuring the length of stainless steel soldered fitting face crack.
Wherein, above-mentioned steps 1) in stainless steel soldered fitting be W-Cu/1Cr18Ni9 stainless steel soldered fittings.
Wherein, above-mentioned steps 1) stainless steel soldered fitting upper end is apart from brazed seam 15mm.
Wherein, above-mentioned steps 2) furnace temperature be set as 500 DEG C or 550 DEG C.
Wherein, above-mentioned steps 2) temperature of reaching the standard grade be 450 DEG C and lower limit temperature is 25 DEG C.
Wherein, above-mentioned steps 2) temperature of reaching the standard grade be 550 DEG C and lower limit temperature is 15 DEG C.
Wherein, above-mentioned steps 3) cycle-index is set as 240~660 times, so that sample is obtained different degrees of heat fatigue damage
Wound.
Wherein, above-mentioned steps 4) after the certain number of cycle, measure stainless steel soldered fitting face crack length, from microcosmic and
Numerical value angle embodies the variable gradient of Thermal Fatigue Damage.
The principle that the present invention generates Thermal Fatigue Damage is W-Cu/1Cr18Ni9 stainless steel soldered fittings, according to expanding with heat and contract with cold
Principle, so that the sample that is suspended on fatigue test machine clamp is generated cycling hot by resistance stove heat and water cooling box cooling and carry
Lotus, and since the coefficient of thermal expansion at W-Cu, 1Cr18Ni9 stainless steel and brazed seam is variant, keep the stress at brazed seam maximum,
It is the region that crackle is easiest to germinating.
The offline temperature of this experiment is 15~25 DEG C, and 550 DEG C of ceiling temperature is the highest temperature of W-Cu composite materials work
Degree, will produce serious oxidation, without use value more than temperature W-Cu composite materials.
Show that, in resistance stove heat 180s, test specimen reaches ceiling temperature 550 by being connected to the thermocouple temperature measurement at brazed seam
DEG C, and 15~25 DEG C can be cooled in cold water storage cistern in 20~30s samples.
Advantageous effect：Compared with prior art, the present invention has the following advantages：
1) the heat fatigue specimen size requirement used in the present invention is not high, and the Thermal Fatigue Damage of various welding points is suitble to survey
It is fixed.
2) the heat fatigue technological parameter setting range selected by the present invention is wide, reaches temperature control essence by using K dress thermocouples
Degree is high, easy to operate.Thermal fatigue tester is attached to sample rotary system, keeps sample heated and cooling uniform.
3) sample after the present invention recycles heat fatigue using SEM is observed, and heat is illustrated from microcosmic and numerical value angle
The degree of fatigue damage so that the present invention has more convincingness.
Description of the drawings
Fig. 1 is the heat fatigue sample schematic diagram of the present invention (red is brazed seam and temperature measuring point)；
Fig. 2 is 450 DEG C of 1 upper limit of embodiment, the temperature cycles oscillogram of 25 DEG C of lower limit；
Fig. 3 is the microscopic feature after 1 soldered fitting heat fatigue of embodiment；
Fig. 4 is 550 DEG C of 2 upper limit of embodiment, the temperature cycles oscillogram of 15 DEG C of lower limit；
Fig. 5 is the microscopic feature after 2 soldered fitting heat fatigue of embodiment.
Specific implementation mode
The present invention is further described below in conjunction with the accompanying drawings.
Embodiment 1
1, hold the circular hole for boring an a diameter of 2~3mm at brazed seam 15mm tired so as to fit heat is suspended on stainless steel
On the fixture of labor testing machine；
2, a K is connected at the brazed seam of W-Cu and 1Cr18Ni9 stainless steels and fills thermocouple, and furnace temperature is set in 500 DEG C, surveys
During examination heats up with stove, the real-time temperature values of sample determine that sample reaches to reach the standard grade and add needed for 25 DEG C of 450 DEG C of temperature and lower limit
The time of heat and water cooling is respectively 200s and 30s, and the oscillogram of temperature cycles is as shown in Figure 2；
3,240 heat fatigue cycles are set, sample reciprocation cycle in bound temperature range is made；
4, after 240 heat fatigues recycle, the length for measuring soldered fitting face crack is 72 μm (Fig. 3).
Embodiment 2
1, hold the circular hole for boring an a diameter of 2~3mm at brazed seam 15mm tired so as to fit heat is suspended on stainless steel
On the fixture of labor testing machine；
2, a K is connected at the brazed seam of W-Cu and stainless steel and fills thermocouple, and furnace temperature is set in 550 DEG C, tests with stove liter
In the process of temperature, the real-time temperature values of sample determine that sample reaches reach the standard grade heating and water cooling needed for 15 DEG C of 550 DEG C of temperature and lower limit
Time be respectively 180s and 20s, the oscillogram of temperature cycles is as shown in Figure 4；
3,660 heat fatigue cycles are set, sample reciprocation cycle in bound temperature range is made；
4, after 660 heat fatigues recycle, the length for measuring soldered fitting face crack is 113 μm, and crack width
Increase (Fig. 5) with apparent.
In conjunction with the embodiments 1 and embodiment 2, after the present invention has embodied heat fatigue cycle-index increase, degree of injury occurs
It is apparent to become serious trend, it can accurately illustrate the phenomenon that Thermal Fatigue Damage changes from each angle, embody heat of the invention tired
The science of labor method for testing performance.
Only it is the preferred embodiment of the present invention described in upper, it should be pointed out that：For those skilled in the art
For, various improvements and modifications may be made without departing from the principle of the present invention, these improvements and modifications should also regard
For protection scope of the present invention.
Claims (8)
1. a kind of thermal fatigue property test method of stainless steel soldered fitting, which is characterized in that include the following steps：
1）The circular hole of an a diameter of 2 ~ 3mm is bored at 10 ~ 20mm of brazed seam so as to fit suspension in stainless steel soldered fitting upper end
On the fixture of thermal fatigue tester；
2）A K is connected at the brazed seam of stainless steel soldered fitting and fills thermocouple, is set furnace temperature as 500 ~ 550 DEG C, is tested with stove
Needed for 15 ~ 25 DEG C of the real-time temperature values of stainless steel soldered fitting during heating, 450 ~ 550 DEG C of temperature of reaching the standard grade and offline temperature
The time of heating and water cooling is respectively 180 ~ 200s and 20 ~ 30s；
3）Different fatigue life cycles is set, stainless steel soldered fitting reciprocation cycle in bound temperature range is made；
4）It is recycling in certain number, is measuring the length of stainless steel soldered fitting face crack.
2. a kind of thermal fatigue property test method of stainless steel soldered fitting according to claim 1, which is characterized in that institute
State step 1）In stainless steel soldered fitting be W-Cu/1Cr18Ni9 stainless steel soldered fittings.
3. a kind of thermal fatigue property test method of stainless steel soldered fitting according to claim 1, which is characterized in that institute
State step 1）Stainless steel upper end is apart from brazed seam 15mm.
4. a kind of thermal fatigue property test method of stainless steel soldered fitting according to claim 1, which is characterized in that institute
State step 2）Furnace temperature be set as 500 DEG C or 550 DEG C.
5. a kind of thermal fatigue property test method of stainless steel soldered fitting according to claim 1, which is characterized in that institute
State step 2）Temperature of reaching the standard grade be 450 DEG C and lower limit temperature is 25 DEG C.
6. a kind of thermal fatigue property test method of stainless steel soldered fitting according to claim 1, which is characterized in that institute
State step 2）Temperature of reaching the standard grade be 550 DEG C and lower limit temperature is 15 DEG C.
7. a kind of thermal fatigue property test method of stainless steel soldered fitting according to claim 1, which is characterized in that institute
State step 3）Cycle-index is set as 240 ~ 660 times.
8. a kind of thermal fatigue property test method of stainless steel soldered fitting according to claim 1, which is characterized in that institute
State step 4）After recycling certain number, stainless steel soldered fitting face crack length is measured, embodies heat from microcosmic and numerical value angle
The variable gradient of fatigue damage.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810370316.8A CN108562482A (en) | 2018-04-24 | 2018-04-24 | A kind of process that the Thermal Fatigue Damage of stainless steel soldered fitting measures |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201810370316.8A CN108562482A (en) | 2018-04-24 | 2018-04-24 | A kind of process that the Thermal Fatigue Damage of stainless steel soldered fitting measures |
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| CN108562482A true CN108562482A (en) | 2018-09-21 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111024487A (en) * | 2019-12-29 | 2020-04-17 | 北京工业大学 | Method for predicting fatigue life of friction stir welding joint based on grain size and microhardness |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN203965269U (en) * | 2013-12-12 | 2014-11-26 | 机械科学研究总院先进制造技术研究中心 | A kind of thermal fatigue test apparatus |
| CN105043914A (en) * | 2015-07-21 | 2015-11-11 | 山东大学 | Test method and device for evaluating thermal fatigue of high-temperature alloy |
-
2018
- 2018-04-24 CN CN201810370316.8A patent/CN108562482A/en active Pending
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN203965269U (en) * | 2013-12-12 | 2014-11-26 | 机械科学研究总院先进制造技术研究中心 | A kind of thermal fatigue test apparatus |
| CN105043914A (en) * | 2015-07-21 | 2015-11-11 | 山东大学 | Test method and device for evaluating thermal fatigue of high-temperature alloy |
Non-Patent Citations (4)
| Title |
|---|
| CHUNZHI XIA 等: "Thermal fatigue damage and residual mechanical properties of W-Cu/Ag-Cu/1Cr18Ni9 brazed joint", 《JOURNAL OF ALLOYS AND COMPOUNDS》 * |
| 全国模具标准化技术委员会: "《中国机械工业标准汇编 冲压模具卷（上）》", 28 February 1999, 中国标准出版社 * |
| 赵少汴 等: "《抗疲劳设计-方法与数据》", 31 March 1997, 机械工业出版社 * |
| 韩增祥: "金属热疲劳试验方法的研究", 《第九届全国热疲劳学术会议》 * |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111024487A (en) * | 2019-12-29 | 2020-04-17 | 北京工业大学 | Method for predicting fatigue life of friction stir welding joint based on grain size and microhardness |
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