Volume 6B: Materials and Fabrication最新文献

Evaluating the Resistance of Austenitic Stainless Steel Welds to Hydrogen Embrittlement 奥氏体不锈钢焊缝抗氢脆性能的评价

Volume 6B: Materials and Fabrication Pub Date : 2019-11-15 DOI: 10.1115/pvp2019-93823

J. Ronevich, C. S. Marchi, D. Balch

引用次数: 3

Load Normalization Method Accounting for Elastic and Elastic-Plastic Crack Growth 考虑弹性和弹塑性裂纹扩展的载荷归一化方法

Volume 6B: Materials and Fabrication Pub Date : 2019-11-15 DOI: 10.1115/pvp2019-93226

K. Wallin, Steven X. Xu

{"title":"Load Normalization Method Accounting for Elastic and Elastic-Plastic Crack Growth","authors":"K. Wallin, Steven X. Xu","doi":"10.1115/pvp2019-93226","DOIUrl":"https://doi.org/10.1115/pvp2019-93226","url":null,"abstract":"\u0000 A single specimen technique to estimate crack length, standardized in ASTM E1820, is the so called load-normalization technique, also known as the Key-curve technique. The method is based on the separability between deformation and crack length. This means that if the load is normalized by a suitable function of crack length, the result will be a single crack length independent load-displacement curve. If this “Key”-curve is known, then based only on load and displacement information it is possible to estimate the corresponding crack length.\u0000 The load normalizing method assumes a plastic response of the specimen during crack growth. If there is crack growth already in the elastic regime, non-linearity in the load-displacement record is not due to plasticity, but due to the crack growth. In this case the standard load-normalization method does not work since it assumes that the non-linearity is due to plasticity or crack tip blunting. Such materials require a modified approach.\u0000 Here, a modified load normalization method accounting for possible elastic crack growth is presented. The method is shown to produce realistic crack growth estimates regardless of plasticity level of the specimen. The method applies an improved load normalization equation compared to the one presently used in ASTM E1820.","PeriodicalId":23651,"journal":{"name":"Volume 6B: Materials and Fabrication","volume":"22 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2019-11-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"74358258","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

A Local Approach to Assess Temperature Effects on Fracture Toughness Incorporating the Measured Distribution of Microcracks 结合微裂纹分布测量评估温度对断裂韧性影响的局部方法

Volume 6B: Materials and Fabrication Pub Date : 2019-11-15 DOI: 10.1115/pvp2019-93186

C. Ruggieri, A. Jivkov

引用次数: 0

Research on the Interference Fit of GV Seat Under the Service Load 服役载荷下GV座椅过盈配合研究

Volume 6B: Materials and Fabrication Pub Date : 2019-11-15 DOI: 10.1115/pvp2019-93304

Hu Yifeng, Sihua Xu, Chen Gang

引用次数: 0

Hydrogen Induced Cracking of a Dissimilar Weld in a Hydrogen Manufacturing Plant 某制氢厂异种焊缝的氢致开裂

Volume 6B: Materials and Fabrication Pub Date : 2019-11-15 DOI: 10.1115/pvp2019-93961

N. Park, J. Penso

引用次数: 0

Weld Residual Stress and Fracture Behavior of NASA Layered Pressure Vessels NASA层状压力容器的焊接残余应力和断裂行为

Volume 6B: Materials and Fabrication Pub Date : 2019-11-15 DOI: 10.1115/pvp2019-94021

F. Brust, R. H. Dodds, J. Hobbs, B. Stoltz, D. Wells

{"title":"Weld Residual Stress and Fracture Behavior of NASA Layered Pressure Vessels","authors":"F. Brust, R. H. Dodds, J. Hobbs, B. Stoltz, D. Wells","doi":"10.1115/pvp2019-94021","DOIUrl":"https://doi.org/10.1115/pvp2019-94021","url":null,"abstract":"\u0000 NASA has hundreds of non-code layered pressure vessel (LPV) tanks that hold various gases at pressure. Many of the NASA tanks were fabricated in the 1950s and 1960s and are still in use. An agency wide effort is in progress to assess the fitness for continued service of these vessels. Layered tanks typically consist of an inner liner/shell (often about 12.5 mm thick) with different layers of thinner shells surrounding the inner liner each with thickness of about 6.25-mm. The layers serve as crack arrestors for crack growth through the thickness. The number of thinner layers required depends on the thickness required for the complete vessel with most tanks having between 4 and 20 layers. Cylindrical layers are welded longitudinally with staggering so that the weld heat affected zones do not overlap. The built-up shells are then circumferentially welded together or welded to a header to complete the tank construction. This paper presents some initial results which consider weld residual stress and fracture assessment of some layered pressure vessels and is a small part of the much larger fitness for service evaluation of these tanks. This effort considers the effect of weld residual stresses on fracture for an inner layer longitudinal weld. All fabrication steps are modeled, and the high-level proof testing of the vessels has an important effect on the final WRS state. Finally, cracks are introduced, and service loading applied to determine the effects of WRS on fracture.","PeriodicalId":23651,"journal":{"name":"Volume 6B: Materials and Fabrication","volume":"70 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2019-11-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"83820784","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 3

Effects of Welding Processes and Techniques on Mechanical and Metallurgical Properties of Dissimilar Metal Weld 焊接工艺和技术对异种金属焊缝力学和冶金性能的影响

Volume 6B: Materials and Fabrication Pub Date : 2019-11-15 DOI: 10.1115/pvp2019-93277

D. Sun, Xinjian Duan

{"title":"Effects of Welding Processes and Techniques on Mechanical and Metallurgical Properties of Dissimilar Metal Weld","authors":"D. Sun, Xinjian Duan","doi":"10.1115/pvp2019-93277","DOIUrl":"https://doi.org/10.1115/pvp2019-93277","url":null,"abstract":"\u0000 The dissimilar metal weld (DMW) is widely used in fabrication and manufacturing in various industries. Joining between nickel-based alloy and ferritic steel tubing and piping is commonly employed for ASME Code compliant welds for high-temperature and corrosion resistance applications.\u0000 A series of DMW samples between alloy 600 pipe and SA-106 Grade B pipe are fabricated using different welding processes, joint design and welding techniques. By detailed comparison, this paper provides insight into the effects of these different welding variables on mechanical properties (tensile properties and hardness of weld materials and heat affected zone), metallurgical properties (macro and microstructure examination) and chemistry (root pass alloying dilution etc.)\u0000 It has been shown that an asymmetric joint bevel design in consideration of different heat dissipation, melting temperature of the two materials will promote good weld bead formation during the root pass welding. Different joint designs (such as with or without consumable insert) will create variations on weld dilution and Cr/Ni recovery in the root area. Other welding variables such as tungsten electrode location for root pass welding for DMW, machine Gas Tungsten Arc Welding (GTAW) using hot wire and cold wire, etc. are also discussed.","PeriodicalId":23651,"journal":{"name":"Volume 6B: Materials and Fabrication","volume":"16 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2019-11-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"80700363","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Re-Evaluation of Stress Rupture Factors for Grade 91 Weldments Based on the Extended Database With the Data Collected in Japan 基于扩展数据库的91级焊接件应力破裂系数的再评价

Volume 6B: Materials and Fabrication Pub Date : 2019-11-15 DOI: 10.1115/pvp2019-93331

K. Kimura, M. Yaguchi

{"title":"Re-Evaluation of Stress Rupture Factors for Grade 91 Weldments Based on the Extended Database With the Data Collected in Japan","authors":"K. Kimura, M. Yaguchi","doi":"10.1115/pvp2019-93331","DOIUrl":"https://doi.org/10.1115/pvp2019-93331","url":null,"abstract":"\u0000 Stress rupture factors and weld strength reduction factors for Grade 91 steel weldments in the codes and literatures have been reviewed. Stress rupture factors for weld metals proposed for Code Case N-47 in the mid 1980’s was defined as a ratio of average rupture strength of the deposited filler metal to the average rupture strength of the base metal. Remarkable drop in creep rupture strength of weldments is significant issue of Grade 91, especially in the low-stress and long-term regime. A premature failure of Grade 91 steel weldments in the long-term, however, is caused by Type IV failure which takes place in the fine grain heat affected zone (FG-HAZ), rather than fracture in the deposited weld metal. The stress rupture factor of the Grade 91 steel, therefore, was based on the creep rupture strength of cross weld test specimens. Creep rupture data of Grade 91 steel weldments reported in the publication of ASME STP-PT-077 was incorporated in the creep database collected in Japan which was used for the previous study. Time and temperature dependent stress rupture factors for Grade 91 steel have been re-evaluated based on the extended database as a ratio of average creep rupture strength of cross weld test specimen to the average creep rupture strength of base metal.","PeriodicalId":23651,"journal":{"name":"Volume 6B: Materials and Fabrication","volume":"49 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2019-11-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"83178868","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 2

Consideration of Thermal Embrittlement in Alloy 316H for Advanced Non-Light Water Reactor Applications 先进非轻水反应堆用316H合金热脆的研究

Volume 6B: Materials and Fabrication Pub Date : 2019-11-15 DOI: 10.1115/pvp2019-93431

W. Ren, Lianshan Lin

{"title":"Consideration of Thermal Embrittlement in Alloy 316H for Advanced Non-Light Water Reactor Applications","authors":"W. Ren, Lianshan Lin","doi":"10.1115/pvp2019-93431","DOIUrl":"https://doi.org/10.1115/pvp2019-93431","url":null,"abstract":"\u0000 To construct advanced non-light water reactors (ANLWRs) operating in the temperature range above that for the traditional light water reactors (LWRs), Alloy 316H is one of the candidate materials because of its inexpensiveness, significant service experience, and qualification for nuclear applications by the American Society of Mechanical Engineers (ASME). However, during the life span at temperatures expected for the ANLWRs, the alloy is likely to experience thermal embrittlement that has not been a concern for the traditional LWRs. To prepare for the development, the possibility of adverse thermal embrittlement effects on Alloy 316H performance in the ANLWRs must be evaluated and a technical basis regarding thermal embrittlement, if necessary, must be established for structural integrity analysis to provide reasonable assurance of adequate nuclear safety protection.\u0000 In this paper, current technical basis for nuclear applications of Alloy 316H deterioration from thermal aging is briefly introduced. The likelihood of adverse thermal embrittlement effects on Alloy 316H performance is evaluated through historical data on microstructural and mechanical property evolution. Characterization of thermal embrittlement is then discussed, followed by a review of predictive models and trend curves for alloy embrittlement. Based on the review and evaluation, technical gaps for addressing thermal embrittlement issues are identified and gap-filling actions are recommended for establishing a technical basis to enable adequate consideration of thermal embrittlement in Alloy 316H applications to the ANLWRs.","PeriodicalId":23651,"journal":{"name":"Volume 6B: Materials and Fabrication","volume":"105 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2019-11-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"77736550","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 2

Crack Growth Rate Model for CISCC of Stainless Steel Canisters 不锈钢罐CISCC裂纹扩展速率模型

Volume 6B: Materials and Fabrication Pub Date : 2019-11-15 DOI: 10.1115/pvp2019-94055

J. Broussard, C. Bryan, R. Sindelar, P. Lam

引用次数: 1