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Failure studies on flow formed high strength pressure vessel: A case study

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Title Failure studies on flow formed high strength pressure vessel: A case study
 
Creator RAJAN, KM
NARASIMHAN, K
 
Subject inclusion
flow forming
microstructure
micro cracks
pressure vessel
 
Description High strength thin walled flow formed tubes are manufactured from AISI 4130 medium carbon low alloy, steel. Starting with an ultimate tensile strength of 650 MPa, the material has recorded a tensile strength of 1250-1300 MPa corresponding to a percentage thickness reduction of 88. It has been observed that material with higher impurity, levels and inclusion ratings are more vulnerable to development of micro cracks at higher percentage thickness reduction. Deformed inclusions like MnS act as stress raisers leading to initiation of micro cracks. Hard to deform inclusions like silicates create high stress concentration at inclusion-matrix interface, leading to de-cohesion and finally cracking. The presence of dissolved gas contents, particularly hydrogen, are harmful in flow forming. Hydrogen embrittlement is a serious problem which is likely, to lead to cracking of the flow formed tube. It could be concluded from this study that clean steel (electro slag refined) processed through hardening and tempering route with a maximum percentage reduction in thickness of 88 or less can give consistently very high strength of the order of 1250-1300 MPa for AISI 4130 steel.
 
Publisher ASME-AMER SOC MECHANICAL ENG
 
Date 2011-07-18T17:36:31Z
2011-12-26T12:50:44Z
2011-12-27T05:36:46Z
2011-07-18T17:36:31Z
2011-12-26T12:50:44Z
2011-12-27T05:36:46Z
2003
 
Type Article
 
Identifier JOURNAL OF PRESSURE VESSEL TECHNOLOGY-TRANSACTIONS OF THE ASME, 125(3), 253-259
0094-9930
http://dx.doi.org/10.1115/1.1593702
http://dspace.library.iitb.ac.in/xmlui/handle/10054/5001
http://hdl.handle.net/10054/5001
 
Language en