CN102359916A - High temperature aging testing method for metal with varying stress - Google Patents
High temperature aging testing method for metal with varying stress Download PDFInfo
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- CN102359916A CN102359916A CN2011102354844A CN201110235484A CN102359916A CN 102359916 A CN102359916 A CN 102359916A CN 2011102354844 A CN2011102354844 A CN 2011102354844A CN 201110235484 A CN201110235484 A CN 201110235484A CN 102359916 A CN102359916 A CN 102359916A
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Abstract
High temperature aging of heat resistant steel is one of the common phenomena for high temperature metal parts in a power station at present. To research aging of high temperature metal parts, a high temperature aging test is usually needed to be designed; however, normal testing methods have low efficiency and can not highly efficiently detect high temperature aging situation of a material under the conditions of different stress. The invention brings forward a novel varying stress high temperature aging testing method; according to the method, a sample with variable cross sections is designed, three different stress states of the same sample are generated by using the variable cross sections under a same aging temperature and a same load, aging is generated under the different stress states, parameters like testing temperature, the value of stress, applied load and aging time are designed, and a high temperature aging test is carried out on a high temperature creep and stress rupture testing machine so as to simulate change laws of organization, structure and performance a metal material under the conditions of high temperature, long-time action and different stress. The invention has the following characteristics: testing is simple; temperature and stress are easy to control; the process of testing is time saving, highly efficient and energy saving; etc.
Description
Technical field
The present invention relates to a kind of varying stress metallic high temperature aging method of testing.Belong to material science.
Background technology
Along with China's development of electric power industry; Many high parameter high capacity fired power generating unit put into operation in succession, and be the problem that domestic and international design, manufacturing, operation, maintenance, supervision and inspection personnel are extremely paid close attention to structural strength, security, reliability and the serviceable life of power station high-temperature metal parts always.Along with the high temperature long-time running, the high temperature ageing problem of these metal parts becomes increasingly conspicuous.Operation when mainly showing as along with high temperature length, the reallocation of metal material generation alloying element, phase composition change, and microstructure is aging, and then causes the material at high temperature strength degradation.The Aging Damage of material quantized rule under research and grasp metal acted on when high temperature is long, and the safe operation that guarantees the high-temperature metal parts is had important theory value and practical significance.
The injuring rule of operation back microstructure and ageing of performance situation and material need be tested to aging conditions such as its structure properties during for acquisition metal material high temperature length.Existing standard is incomplete at present, and the method for inspection is imperfect, not directly perceived, especially the New Heat-Resistant Steel after the long-time running is lacked effective monitoring especially.Therefore, design high-temperature aging aging test can obtain Changing Pattern and quantitative relationship between service condition such as heat-resisting steel temperature, stress and time and the parameters such as phase structure, microstructure and performance.
Existing high-temperature aging ageing testing method; At first be to make sample, existing sample generally all is that xsect is the rod of circle or rectangle, and two ends are bigger gripping section; The centre is the test section of less same area of section, is provided with the arc transition section between two sections.Sample middle part sectional dimension is single, and the each test of such sample can only be measured at every turn can only test a parameter.Carry out the metal parts varying stress high-temperature aging burn-in test in multiple cross section for needs, require a great deal of time and testing expenses.
Summary of the invention
The object of the invention just is to provide a kind of varying stress metallic high temperature aging method of testing rapidly and efficiently, has the advantages that testing efficiency height, cost are low, the test duration is short, for New Heat-Resistant Steel operational monitoring after the long-time running provides the important theory foundation.
For realizing above-mentioned purpose, technical scheme provided by the invention is: a kind of varying stress metallic high temperature aging method of testing comprises sample production; It is characterized in that: described sample is a strip, and two ends are that gripping section is identical with conventional lasting sample, and the centre is a test section; Be provided with the arc transition section between two sections; Test section wherein is variable cross section circle or rectangular profile, and area of section progressively reduces from the gripping section to the center, and rounding off connects between the different cross section.
If be the rectangle aging sample, gripping section test width is 25mm, and monolateral length is 30mm.Center variable cross section length range is 51-66mm, and thickness is 1-10mm, and different cross section obtains through change width; Its thickness is constant; Its change width scope is 5-10mm, and test section is made up of 1-5 joint different cross section member, and cross-sectional width progressively reduces from the gripping section to the center;
If be circular specimen, when diameter was 5mm, then the sample total length was 66mm, and the monolateral length of gripping section is 17mm, and center variable cross section partial-length is 25mm; When diameter was 10mm, the monolateral length of gripping section was 32mm, and center variable cross section part total length is 50mm, and different cross section obtains through vary in diameter, and test section is made up of the 1-5 joint of symmetry, and diameter of movement gradually reduces from the gripping section to the central area.
The present invention is on the basis of conventional high temperature tension test sample; Change sample middle part sectional dimension single, each measurement and can only test the shortcoming of a parameter; The central area is designed to the combination of the member of a plurality of sectional dimensions (lifting surface area), in the aging conditions that promptly can test the sample under the different stress under the same temperature conditions.Increased substantially the efficient of aging test, it is simple to have method of testing, and the temperature stress parameter is easy to control, and process of the test saves time, efficient, energy-conservation characteristics.
Description of drawings
Rectangle variable cross section high temperature ageing specimen size figure and the pictorial diagram of Fig. 1 (a, b) for being adopted among the present invention;
Fig. 2 (a, b, c, d) is sample pictorial diagram behind the high-temperature circulation test that the present invention did;
The varying stress high temperature ageing ag(e)ing test schematic diagram of device that Fig. 3 adopts for the present invention;
Fig. 4 (a, b) is different temperatures of the present invention, identical stress aging sample micro-organization chart;
Fig. 5 (a, b, c, d) is the same temperature of the present invention (700 ℃), different stress aging sample micro-organization chart.
Embodiment
Below in conjunction with concrete embodiment technical scheme of the present invention is described further.
Varying stress metallic high temperature aging method of testing of the present invention, except that sample production, other step is identical with conventional varying stress metallic high temperature aging method of testing; Difference just is sample production, and is as shown in Figure 1, and sample of the present invention is a strip; Two ends are that gripping section is identical with conventional lasting sample; The centre is a test section, is provided with the arc transition section between two sections, and test section wherein is variable cross section circle or rectangular profile; Area of section progressively reduces from the gripping section to the center, and rounding off connects between the different cross section.
Embodiment 1: adopt the rectangular specimen cross section; Center variable cross section size is respectively 10 * 5mm, 12.5 * 5mm, three kinds of cross sections of 15 * 5mm; Test temperature is 600 ℃; Design load is 7500N, design stress be respectively 150MPa (10 * 5mm), 120MPa (12.5 * 5mm), (15 * 5mm), the original total length of sample is 158.5mm to 90MPa.
After long-time aging test, the sample total length becomes 160.6mm, and 10 * 5.06mm sectional dimension becomes that 9.91 * 5.03mm, 12.5 * 5.08mm sectional dimension become 12.45 * 5.06mm, 15 * 5.04mm sectional dimension becomes 15.00 * 5.03mm.Because stress is different, under same temperature, the ageing state of sample is different, and aging conditions can be judged from the microstructure of sample.
Embodiment 2: adopt the rectangular specimen cross section; Center variable cross section size is respectively 10.00 * 5mm, 12.50 * 5.00mm, three kinds of cross sections of 15.01 * 5mm; Test temperature is 650 ℃, and design load is 4500N, design stress be respectively 90MPa (10 * 5mm), 70MPa (12.5 * 5mm), 60MPa (15 * 5mm); The original total length of sample is 158.5mm; After long-time aging test, the sample total length becomes 162.3mm, and 10.00 * 5.01mm sectional dimension becomes that 9.55 * 4.86mm, 12.50 * 5.00mm sectional dimension become 12.47 * 4.98mm, 15.01 * 5.09mm sectional dimension becomes 14.93 * 5.07mm.Because stress is different, under same temperature, the ageing state of sample is different, and aging conditions can be judged from the microstructure of sample.
Embodiment 3: adopt the rectangular specimen cross section; Center variable cross section size is respectively 10 * 5mm, 12 * 5mm, three kinds of cross sections of 14 * 5mm; Test temperature is 675 ℃, and design load is 3500N, design stress be respectively 70MPa (10 * 5mm), 60MPa (12 * 5mm), 50MPa (14 * 5mm); The original total length of sample is 158.5mm; After long-time aging test, the sample total length becomes 160.2mm, and 10.05 * 5.06mm sectional dimension becomes that 9.94 * 4.97mm, 12.06 * 5.09mm sectional dimension become 11.99 * 5.07mm, 14.07 * 5.00mm sectional dimension becomes 13.99 * 4.99mm.Because stress is different, under same temperature, the ageing state of sample is different, and aging conditions can be judged from the microstructure of sample.
Embodiment 4: adopt the rectangular specimen cross section; Center variable cross section size is respectively 10 * 5mm, 12 * 5mm, three kinds of cross sections of 14 * 5mm; Test temperature is 700 ℃, and design load is 2500N, design stress be respectively 50MPa (10 * 5mm), 40MPa (12 * 5mm), 30MPa (14 * 5mm); The original total length of sample is 158.5mm; After long-time aging test, the sample total length becomes 173.0mm, and 10.05 * 5.06mm sectional dimension becomes that 4.77 * 1.41mm, 12.06 * 5.07mm sectional dimension become 11.92 * 5.02mm, 14.06 * 5.07mm sectional dimension becomes 13.94 * 4.98mm.Because stress is different, under same temperature, the ageing state of sample is different, and aging conditions can be judged from the microstructure of sample.
As shown in Figure 1, aging sample that the present invention adopts is rectangle variable cross section specimen size figure and pictorial diagram, and the sample center section is divided into 5 sections, and first section is the arc transition section, and second section width is 15mm, and length is 20mm; The 3rd section width is 10mm, and length is 28mm; The 4th section width is 12.5mm, and length is 20mm, the 5th section and first section consistent size.Through this kind structure, in drawing process, under identical temperature, first to five section stress that bears is different, causes its microstructure that apparent in view variation takes place, and produces the material different changes in microstructure.That is to say that high-temperature circulation test of employing reaches the effect of test of many times.And conventional ageing testing method, interlude size constancy generally speaking, its stress that bears is identical, and the material microstructure of acquisition is also identical, and testing efficiency is lower.
Fig. 2 is sample pictorial diagram behind the different high-temperature circulation tests that the present invention did; As can be seen from the figure, sample fracture after 700 ℃ of aging tests at the maximum stress place, 600 ℃, 650 ℃, 675 ℃ samples are identical with 700 ℃ of aging test times.
The varying stress high temperature ageing ag(e)ing test schematic diagram that Fig. 3 adopts for the present invention.
A kind of varying stress high-temperature aging ageing testing method that the present invention adopted, through design variable cross section aging sample, the variable cross section sample that processing and fabricating is good is installed on the sample chuck of common high-temerature creep testing machine; The sample coated outside high-temperature heater; Through attemperating unit setting, measurement and control aging test temperature,, design load is added on the aging sample through charger and leverage; Because the working portion of sample is a variable cross section; Lifting surface area is different different because of the position, so at same sample, produce multiple stress state with a kind of load, obtain the aging sample of different stress simultaneously.
Fig. 4 is different temperatures that the present invention did, identical stress contrast aging sample micro-organization chart, as can be seen from the figure, under the identical stress condition after the different temperatures aging test T91 structure of steel change obviously.Microstructure keeps former tempered martensite characteristic, and along with the rising of temperature, the fine particle shape carbonide that former crystal boundary and martensite lath interfascicular are separated out is grown up and alligatoring, and the tiny carbonide quantity of former disperse reduces.
Fig. 5 is sample micro-organization chart after the different stress aging tests of same temperature (700 ℃) that the present invention did; As can be seen from the figure; Under the different stress condition of same temperature; Obvious variation has taken place in the microstructure of T91 steel, along with the increase carbonide of stress is grown up obviously, and the material aging aggravation.
Table 1 is the aging test data, has listed different temperature varying stress aging sample test parameters and specimen size data.
Table 1 different temperature varying stress aging sample test parameters and specimen size
Claims (3)
1. a varying stress metallic high temperature aging method of testing comprises sample production, and it is characterized in that: described sample is a strip; Two ends are gripping section, and are identical with conventional lasting sample, and the centre is a test section; Be provided with the arc transition section between two sections; Test section wherein is variable cross section circle or rectangular profile, and area of section progressively reduces from the gripping section to the center, and rounding off connects between the different cross section.
2. varying stress metallic high temperature aging method of testing according to claim 1, it is characterized in that: described sample is the rectangle aging sample, gripping section test width is 25mm; Monolateral length is 30mm, and center variable cross section length range is 51-66mm, and thickness is 1-10mm; Different cross section obtains through change width; Its thickness is constant, and its change width scope is 5-10mm, and test section is made up of 1-5 joint different cross section member.
3. varying stress metallic high temperature aging method of testing according to claim 1; It is characterized in that: described sample is a circular specimen, and when diameter was 5mm, then the sample total length was 66mm; The monolateral length of gripping section is 17mm, and center variable cross section partial-length is 25mm; When diameter was 10mm, the monolateral length of gripping section was 32mm, and center variable cross section part total length is 50mm, and different cross section obtains through vary in diameter, and test section is made up of the 1-5 joint of symmetry.
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106802258A (en) * | 2016-12-13 | 2017-06-06 | 合肥通用机械研究院 | High temperature creep property method of testing based on variable cross-section sample |
| CN107885905A (en) * | 2017-10-13 | 2018-04-06 | 常州大学 | A kind of creep constitutive model construction method based on multi-section list sample |
| CN109238895A (en) * | 2018-07-20 | 2019-01-18 | 苏州热工研究院有限公司 | Stress corrosion and environment fatigue high throughput test device and method |
| CN109238842A (en) * | 2018-07-20 | 2019-01-18 | 苏州热工研究院有限公司 | Stress corrosion high throughput evaluation method based on multi-section sample |
| CN110793873A (en) * | 2019-09-30 | 2020-02-14 | 鞍钢股份有限公司 | Method for preventing deformation of sample during heating from influencing test precision |
| CN113324846A (en) * | 2021-05-28 | 2021-08-31 | 中国人民解放军国防科技大学 | Accelerated aging test method and device for solid propellant |
| CN113376013A (en) * | 2021-05-12 | 2021-09-10 | 首钢京唐钢铁联合有限责任公司 | Strip steel sample for forming limit test and limit test method |
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| CN201464300U (en) * | 2009-07-27 | 2010-05-12 | 洛阳市谱瑞慷达耐热测试设备有限公司 | High-temperature load soft creep tester for multiple samples |
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| JPS6353440A (en) * | 1986-08-25 | 1988-03-07 | Mitsubishi Heavy Ind Ltd | Material tester |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN106802258A (en) * | 2016-12-13 | 2017-06-06 | 合肥通用机械研究院 | High temperature creep property method of testing based on variable cross-section sample |
| CN107885905A (en) * | 2017-10-13 | 2018-04-06 | 常州大学 | A kind of creep constitutive model construction method based on multi-section list sample |
| CN109238895A (en) * | 2018-07-20 | 2019-01-18 | 苏州热工研究院有限公司 | Stress corrosion and environment fatigue high throughput test device and method |
| CN109238842A (en) * | 2018-07-20 | 2019-01-18 | 苏州热工研究院有限公司 | Stress corrosion high throughput evaluation method based on multi-section sample |
| CN110793873A (en) * | 2019-09-30 | 2020-02-14 | 鞍钢股份有限公司 | Method for preventing deformation of sample during heating from influencing test precision |
| CN110793873B (en) * | 2019-09-30 | 2021-12-24 | 鞍钢股份有限公司 | Method for preventing deformation of sample during heating from influencing test precision |
| CN113376013A (en) * | 2021-05-12 | 2021-09-10 | 首钢京唐钢铁联合有限责任公司 | Strip steel sample for forming limit test and limit test method |
| CN113324846A (en) * | 2021-05-28 | 2021-08-31 | 中国人民解放军国防科技大学 | Accelerated aging test method and device for solid propellant |
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Address after: 510080 Dongfeng East Road, Dongfeng, Guangdong, Guangzhou, Zhejiang Province, No. 8 Co-patentee after: WUHAN University Patentee after: ELECTRIC POWER RESEARCH INSTITUTE OF GUANGDONG POWER GRID Co.,Ltd. Address before: 510080 Dongfeng East Road, Dongfeng, Guangdong, Guangzhou, Zhejiang Province, No. 8 Co-patentee before: Wuhan University Patentee before: ELECTRIC POWER RESEARCH INSTITUTE OF GUANGDONG POWER GRID Corp. |
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Effective date of registration: 20200706 Address after: 510080 Dongfeng East Road, Dongfeng, Guangdong, Guangzhou, Zhejiang Province, No. 8 Co-patentee after: WUHAN University Patentee after: ELECTRIC POWER RESEARCH INSTITUTE OF GUANGDONG POWER GRID Co.,Ltd. Address before: 510630, No. 146-150, No. fifth, Whampoa Avenue, Tianhe District, Guangdong, Guangzhou Co-patentee before: WUHAN University Patentee before: GUANGDONG DIANKEYUAN ENERGY TECHNOLOGY Co.,Ltd. |
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