Effects of Thermal Aging on Microstructure and Mechani-cal Properties of Interface of Hot Isostatic Pressing Densified Low Alloy Steel with Inconel 690 Cladding

doi:10.12442/j.issn.1002-185X.20240100

Home > Archive>Volume 54, Issue 4, 2025 >879-885. DOI:10.12442/j.issn.1002-185X.20240100

Effects of Thermal Aging on Microstructure and Mechani-cal Properties of Interface of Hot Isostatic Pressing Densified Low Alloy Steel with Inconel 690 Cladding
DOI:
                        10.12442/j.issn.1002-185X.20240100
                    
Author:
                        Yu Lei1,2Yu Lei
State Key Laboratory of Advanced Processing and Recycling of Nonferrous Metals, Lanzhou University of Technology, Lanzhou 730050, China;School of Materials Science and Engineering, Lanzhou University of Technology, Lanzhou 730050, China
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Cao Rui1,2Cao Rui
State Key Laboratory of Advanced Processing and Recycling of Nonferrous Metals, Lanzhou University of Technology, Lanzhou 730050, China;School of Materials Science and Engineering, Lanzhou University of Technology, Lanzhou 730050, China
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Ma Jinyuan1,2Ma Jinyuan
State Key Laboratory of Advanced Processing and Recycling of Nonferrous Metals, Lanzhou University of Technology, Lanzhou 730050, China;School of Materials Science and Engineering, Lanzhou University of Technology, Lanzhou 730050, China
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Yan Yingjie1,2Yan Yingjie
State Key Laboratory of Advanced Processing and Recycling of Nonferrous Metals, Lanzhou University of Technology, Lanzhou 730050, China;School of Materials Science and Engineering, Lanzhou University of Technology, Lanzhou 730050, China
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Dong Hao3,4Dong Hao
Advanced Technology & Materials Co., Ltd, Beijing 100081, China;Hebei Hot Isostatic Pressing Technology Innovation Center, Zhuozhou 072750, China
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Wang Caiqin3,4Wang Caiqin
Advanced Technology & Materials Co., Ltd, Beijing 100081, China;Hebei Hot Isostatic Pressing Technology Innovation Center, Zhuozhou 072750, China
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Affiliation:1.State Key Laboratory of Advanced Processing and Recycling of Nonferrous Metals, Lanzhou University of Technology, Lanzhou 730050, China;2.School of Materials Science and Engineering, Lanzhou University of Technology, Lanzhou 730050, China;3.Advanced Technology & Materials Co., Ltd, Beijing 100081, China;4.Hebei Hot Isostatic Pressing Technology Innovation Center, Zhuozhou 072750, China
Clc Number:
Fund Project:Major Scientific and Technological Project of Gansu (22ZD6GA008); Excellent Doctorate Project of Gansu (23JRRA806); National Natural Science Foundation of China (52175325, 51961024, 52071170)

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Abstract:

The microstructure, micro-hardness, and tensile properties of interface between hot isostatic pressing densified low alloy steel and Inconel 690 cladding were investigated during the aging process at 600 ℃. The results show that the interface region can be divided into four zones from base metal to deposited metal: carbon-depleted zone (CDZ), partial melting zone (PMZ), planar growth zone (PGZ), and brownish feature zone (BFZ). Dimensions of these zones do not significantly change during aging. However, type I carbides noticeably increase in size in the PMZ, and precipitates clearly occur in the PGZ. The main reason for their growth and occurrence is continuous carbon migration. The highest micro-hardness appears in the PGZ and BFZ regions, which is related to carbon accumulation and precipitates in these regions. Tensile failure occurs on the base metal side due to the high strength mismatch between these two materials. The CDZ, composed of only ferrite, has lower strength and fractures at the boundary between CDZ and base metal. The ultimate tensile strength decreases by only 50 MPa after aging for 1500 h, and the interface region maintains high strength without significant deformation.

Key words:interface;thermal aging;microstructure;mechanical properties;hot isostatic pressing densification

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[Yu Lei, Cao Rui, Ma Jinyuan, Yan Yingjie, Dong Hao, Wang Caiqin. Effects of Thermal Aging on Microstructure and Mechani-cal Properties of Interface of Hot Isostatic Pressing Densified Low Alloy Steel with Inconel 690 Cladding[J]. Rare Metal Materials and Engineering,2025,54(4):879~885.]
DOI：10.12442/j. issn.1002-185X.20240100

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Received:February 28,2024
Revised:March 17,2025
Adopted:April 18,2024
Online: April 23,2025
Published: April 21,2025

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