Remnant Life Prediction of Service-Exposed 12Cr1MoV Superheater Tube in Power Plant

2013 ◽  
Vol 791-793 ◽  
pp. 382-385
Author(s):  
Xin Wei Zhu ◽  
Hong Hui Cheng ◽  
Mei Hua Shen ◽  
Jin Ping Pan
Keyword(s):  
High Temperature ◽  
Tensile Test ◽  
Life Prediction ◽  
Rupture Life ◽  
Tensile Creep ◽  
Working Temperature ◽  
Working Stress ◽  
Superheater Tube ◽  
High Temperature Tensile ◽  
The Relationship

Tensile test at ambient temperature, tensile test at high temperature and high temperature tensile creep test were carried out before remnant life prediction. According to the high temperature tensile creep test data, the relationship between working stress, working temperature and rupture life was obtained by MATLAB surface fitting tool. In order to obtain the temperature field and stress field of the superheater tube, ANSYS software was used. Then, the remnant life of the superheater tube was predicted by the extrapolating method and the relationship between working stress, working temperature and rupture life.

The High-Temperature Tensile Test of Quartz Fiber Fabric- Reinforced Resin Composites

2021 ◽  
Vol 904 ◽  
pp. 188-195
Author(s):  
Hua Qiong Wang ◽  
Li Li Zhang ◽  
Da Cheng Jiao ◽  
Yan Ru Wang ◽  
Zeng Hua Gao
Keyword(s):  
Tensile Strength ◽  
High Temperature ◽  
Tensile Test ◽  
Tensile Properties ◽  
Tensile Modulus ◽  
National Standard ◽  
Resin Composites ◽  
Quartz Fiber ◽  
High Temperature Tensile ◽  
Fiber Fabric

The tensile properties of quartz fiber fabric-reinforced resin composites at high temperature were studied. The effects of specimen type and dimension, temperature loading procedure, holding time and loading rate on the tensile properties of the composites at high temperatures were analyzed through series of comparative experiments, the tensile test parameters were determined. Chinese national standard for high-temperature tensile property testing of the composites was compiled based on the data collected. According to the established standard, the tensile testing at 500°C was carried out. Compared with the tensile properties at room temperature, the tensile strength and tensile modulus of the composite at high temperature decreases significantly, with the tensile strength decreasing by about 42.32% and the tensile modulus decreasing by about 24.18%. This is mainly due to the high temperature which causes part of the resin matrix to pyrolyze and detach from around the fiber, thus losing the integrity of the material. In addition, this national standard for high-temperature tensile properties has some general applicability to different types of fiber-reinforced resin composites.

Microstructural evolution of TiC/near-α Ti composite during high-temperature tensile test

2016 ◽  
Vol 31 (21) ◽  
pp. 3428-3436
Author(s):  
J.Q. Qi ◽  
J. Lu ◽  
Y.Z. He ◽  
Y.W. Sui ◽  
Q.K. Meng ◽  
...  
Keyword(s):  
High Temperature ◽  
Tensile Test ◽  
Microstructural Evolution ◽  
Image Position ◽  
High Temperature Tensile

Abstract

Simulation Research on Process Adaptability of Alloy Structural Steel 50Mn2V

2012 ◽  
Vol 573-574 ◽  
pp. 1178-1181
Author(s):  
Zhong Bo Dong ◽  
Han Xiong Dong ◽  
Xia Hong
Keyword(s):  
High Temperature ◽  
Tensile Test ◽  
Structural Steel ◽  
High Strength Steels ◽  
High Strength ◽  
Simulation Research ◽  
Deformation Test ◽  
High Temperature Tensile ◽  
Test Result

This paper analyzes the adaptability of process of alloy structural steel 50Mn2V by simulating research. Through the high temperature tensile test、the multi-pass deformation test we study the deforming resistance characteristics of 50Mn2V steel, and carry on the contrast with high strength steels P20（3Cr2Mo）of a factory; Through thermo-plasticity test the high temperature thermoplastic of 50Mn2V steel is studied. The test result indicates a factory has ability to produce the high strength 50Mn2V steel completely with present equipment.

FRACTURE OF HIGH CHROMIUM ALLOYED PM STEEL AT ROOM AND HIGH TEMPERATURE TENSILE TEST

2013 ◽  
Vol 3 (0) ◽  
Author(s):  
Ruslan Shvab ◽  
Eva Dudrová ◽  
Pavol Hvizdoš ◽  
Ola Bergman ◽  
Sven Bengtsson
Keyword(s):  
High Temperature ◽  
Tensile Test ◽  
High Chromium ◽  
High Temperature Tensile

Experimental Study and Numerical Simulation of the Tensile Test for GH4169 Coated with YSZ Coating at High Temperature

2015 ◽  
Vol 782 ◽  
pp. 237-244
Author(s):  
Lin Lin Wang ◽  
Qun Bo Fan ◽  
Hong Mei Zhang ◽  
Fu Chi Wang
Keyword(s):  
High Temperature ◽  
Tensile Test ◽  
Tensile Deformation ◽  
Axial Stress ◽  
Simulation Method ◽  
Metal Substrate ◽  
Transitional Region ◽  
Failure Initiation ◽  
Ysz Coating ◽  
High Temperature Tensile

In this study, high temperature tensile test was conducted on the specimen of superalloy GH4169 coated with wt8%-YSZ under the conditions of 950°C and 80MPa. By using finite element (FE) simulation method, the failure initiation and evolution of the metal substrate and YSZ coating were predicted. It was found that stress concentration originally occurred in the YSZ ceramic top coating, causing an axial stress and triggering severe debonding failure in the center region of the specimen at t=180s. With increased load, further interfacial debonding failure of the residual coating occurred due to the presence of oblique tensile stress and at t=900s, and only a few residues can be seen at the arc transitional region. Subsequently, the metal substrate was subjected to uniform tensile deformation and finally ruptured at t=76min with apparent necking. In addition, it was notable that YSZ coating can relieve stress significantly (nearly 40% lower), thus helping prolong the substrate's service life in the same environment. Simulated results were consistent with observed behavior.

scholarly journals HIGH TEMPERATURE TENSILE TEST OF 12Cr FERRITIC ODS STEEL

2019 ◽  
Vol 9 (2) ◽  
pp. 275-288
Author(s):  
Antonino Meli ◽  
◽  
Huilong Yang ◽  
Kano Sho ◽  
Hiroaki Abe ◽  
...  
Keyword(s):  
High Temperature ◽  
Tensile Test ◽  
Ods Steel ◽  
High Temperature Tensile

Remaining Lifetime Evaluation of High Temperature Components of Power Plant Steam Boilers: Case Studies

2009 ◽  
Author(s):  
Vaclav Mentl ◽  
Va´clav Lisˇka ◽  
Jaroslav Koc ◽  
Michal Chocholousˇek
Keyword(s):  
High Temperature ◽  
Power Plants ◽  
Fatigue Loading ◽  
Assessment Method ◽  
Operational Capability ◽  
Safety Coefficient ◽  
Working Temperature ◽  
Working Stress ◽  
Steam Boilers ◽  
High Temperature Components

The energy producing power plants are designed for operational period of 20, 30 years. During this period, inspections are realized to investigate the operational capability of the respective components and the plant as a whole, and when the designed time is approaching its limit, the crucial questions are raised with respect to the following possible operation, its safety and risks that stem from the fact that the continuous degradation of material properties occured during the longtime service as a result of service conditions, e.g. high temperatures, fatigue loading etc. The inspection of the boiler and the assessment of its future operational capability should ensure the safe operation and minimazing the failure risks. In comparison with the more sofisticated and much more expensive methods that use numbers of variables that enter the evaluation process of the lifetime exhaustion, or the metallographic non-destructive or even destructive methods that do not result often in a quantitative lifetime assessment, a relatively simple assessment method was used to evaluate the remaining lifetime of the high temperature components. On the basis of accelerated creep test data performed on the degraded materials, the remaining lifetime hours were calculated for the three “safety” situations: 1. “ZERO SAFETY” (neither recommended k = 1, 5 safety coefficient for working stress nor +70deg Celsius increase of working temperature were taken into consideration). 2. “STRESS SAFETY” (1, 5 safety coefficient for working stress and working temperature were taken into consideration). 3. “FULL SAFETY” (1, 5 safety coefficient for working stress and working temperature +70 deg Celsius were taken into consideration). This paper summarizes the results of remaining lifetime calculation for three different cases of steam boilers inspected after longtime service by Skoda Research ltd. Recently. On the basis of performed examination, the results provided the customer the recommendations relating the future safe and reliable operation.

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