Quantification of Creep Cavitation in Welded Joint and Evaluation of Material Characteristics of Simulated Heat-Affected Zone in X 20 CrMoV 12 1 Steel

[+] Author and Article Information
Yong-Keun Chung, Ik-Man Park

Metallurgical Engineering Department, Pusan National University, Pusan, Korea

Cheol-Hong Joo, Jong-Jin Park

R&D Center, Korea Heavy Industries and Construction Co., Ltd. Changwon, Korea

Hyo-Jin Kim

Korea Aviation Polytechnic College, Sachon, Korea

J. Pressure Vessel Technol 123(1), 112-117 (Oct 20, 2000) (6 pages) doi:10.1115/1.1333094 History: Received September 18, 2000; Revised October 20, 2000
Copyright © 2001 by ASME
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Wu,  R., and Sandstrom,  R., 1995, “Creep Cavity Nucleation and Growth in 12Cr-Mo-V Steel,” Mater. Sci. Technol., 11, pp. 579–588.
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Schematic Illustration of creep specimen taken from the welded joint of pipe
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Photographs of cross sections for creep-ruptured specimens—(a) 575°C, 150 MPa; (b) 600°C, 100 MPa; (c) 600°C, 120 MPa; (d) 650°C, 60 MPa
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Typical optical micrograph of cross section of creep- ruptured specimen at 650°C, 60 MPa
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Cavitated area fraction (a), average diameter of cavity (b), and number of cavity (c), with creep life fraction
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Changes in microhardness of crept specimens with creep life fraction (t/tr)—(a) 650°C, 60 MPa; (b) 600°C, 120 MPa; (c) 600°C, 100 MPa; (d) 575°C, 150 MPa
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SEM fractographs of creep-ruptured specimen tested at 600°C, 100 MPa, for 4243 h
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Optical micrograph (a), and microhardness (b), of X 20 CrMoV 12 1 welded joint
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SEM micrographs showing the microstructure of (a) intercritical HAZ, and preliminary specimens heated to max. temperature (b) 780°C, (c) 860°C, and (d) 1050°C
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Grain size of preliminary specimens to simulating intercritical HAZ—(a) average area of grain, (b) average diameter of grain
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Microhardness of preliminary specimens to simulating intercritical HAZ
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Tensile properties of simulated HAZ and base metal at various testing temperatures—(a) yield and tensile strength, (b) elongation and reduction of area
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Impact properties of simulated HAZ specimen
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Typical cross section of creep-ruptured specimen for simulated HAZ at 650°C, 60 MPa
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Master curve of Larson-Miller parameter for simulated HAZ, actual HAZ, and base metal



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