Microstructure and mechanical properties of TLP-bonded 9CrMoCoB heat-resistant steel with Ni–Cr–B interlayer
9CrMoCoB heat-resistant steel was transient liquid phase (TLP) bonded by using a Ni–Cr–B amorphous filler metal. Results indicated that the TLP-bonded joint was composed of three feature regions, and the precipitates in the diffusion affected zone (DAZ) were M _23 (C,B) _6 -type carboborides and M _...
| Main Authors: | , , , , |
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| Format: | Article |
| Language: | English |
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IOP Publishing
2022-01-01
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| Series: | Materials Research Express |
| Subjects: | |
| Online Access: | https://doi.org/10.1088/2053-1591/ac6ec1 |
| _version_ | 1797746324160905216 |
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| author | Yingjun Jiao Guangmin Sheng Xue Li Yuntao Zhang Xinjian Yuan |
| author_facet | Yingjun Jiao Guangmin Sheng Xue Li Yuntao Zhang Xinjian Yuan |
| author_sort | Yingjun Jiao |
| collection | DOAJ |
| description | 9CrMoCoB heat-resistant steel was transient liquid phase (TLP) bonded by using a Ni–Cr–B amorphous filler metal. Results indicated that the TLP-bonded joint was composed of three feature regions, and the precipitates in the diffusion affected zone (DAZ) were M _23 (C,B) _6 -type carboborides and M _3 B _2 -type borides with different morphologies and locations. Fine granular Fe _2 Mo-type Laves phases and MX-type carbides that existed in the original base metal were found in the grain. The carboborides and borides in the DAZ that grew with the increase in bonding time and temperature were reduced or completely dissolved after post weld heat treatment (PWHT). The joints without PWHT showed high strength and low elongation due to the high hardness and high hardenability of the matrix. The initiation of cracks occurred on borides in the athermal solidification zone and carboborides in the Ni-DAZ and passed through in the bonded seam, resulting in the reduction in the tensile strength of the bonded joints. The hardness of the joints was obviously reduced, and their toughness was obviously improved after PWHT. The highest tensile strength reached to 744 MPa when the TLP joints were bonded at 1150 °C for 30 min, which was comparable with the original base metal. |
| first_indexed | 2024-03-12T15:36:09Z |
| format | Article |
| id | doaj.art-3ef61f236f6e4fccbd720af86ecd4bc5 |
| institution | Directory Open Access Journal |
| issn | 2053-1591 |
| language | English |
| last_indexed | 2024-03-12T15:36:09Z |
| publishDate | 2022-01-01 |
| publisher | IOP Publishing |
| record_format | Article |
| series | Materials Research Express |
| spelling | doaj.art-3ef61f236f6e4fccbd720af86ecd4bc52023-08-09T16:12:57ZengIOP PublishingMaterials Research Express2053-15912022-01-019606650210.1088/2053-1591/ac6ec1Microstructure and mechanical properties of TLP-bonded 9CrMoCoB heat-resistant steel with Ni–Cr–B interlayerYingjun Jiao0Guangmin Sheng1https://orcid.org/0000-0002-9552-8531Xue Li2Yuntao Zhang3Xinjian Yuan4College of Materials Science and Engineering, Chongqing University , No. 174, Shazheng Street, Shapingba District, Chongqing 400044, People’s Republic of ChinaCollege of Materials Science and Engineering, Chongqing University , No. 174, Shazheng Street, Shapingba District, Chongqing 400044, People’s Republic of ChinaCollege of Materials Science and Engineering, Chongqing University , No. 174, Shazheng Street, Shapingba District, Chongqing 400044, People’s Republic of ChinaCollege of Materials Science and Engineering, Chongqing University , No. 174, Shazheng Street, Shapingba District, Chongqing 400044, People’s Republic of ChinaCollege of Materials Science and Engineering, Chongqing University , No. 174, Shazheng Street, Shapingba District, Chongqing 400044, People’s Republic of China9CrMoCoB heat-resistant steel was transient liquid phase (TLP) bonded by using a Ni–Cr–B amorphous filler metal. Results indicated that the TLP-bonded joint was composed of three feature regions, and the precipitates in the diffusion affected zone (DAZ) were M _23 (C,B) _6 -type carboborides and M _3 B _2 -type borides with different morphologies and locations. Fine granular Fe _2 Mo-type Laves phases and MX-type carbides that existed in the original base metal were found in the grain. The carboborides and borides in the DAZ that grew with the increase in bonding time and temperature were reduced or completely dissolved after post weld heat treatment (PWHT). The joints without PWHT showed high strength and low elongation due to the high hardness and high hardenability of the matrix. The initiation of cracks occurred on borides in the athermal solidification zone and carboborides in the Ni-DAZ and passed through in the bonded seam, resulting in the reduction in the tensile strength of the bonded joints. The hardness of the joints was obviously reduced, and their toughness was obviously improved after PWHT. The highest tensile strength reached to 744 MPa when the TLP joints were bonded at 1150 °C for 30 min, which was comparable with the original base metal.https://doi.org/10.1088/2053-1591/ac6ec1microstructuremechanical propertiesheat-resistant steeltransient liquid phase bondingpost weld heat treatment |
| spellingShingle | Yingjun Jiao Guangmin Sheng Xue Li Yuntao Zhang Xinjian Yuan Microstructure and mechanical properties of TLP-bonded 9CrMoCoB heat-resistant steel with Ni–Cr–B interlayer Materials Research Express microstructure mechanical properties heat-resistant steel transient liquid phase bonding post weld heat treatment |
| title | Microstructure and mechanical properties of TLP-bonded 9CrMoCoB heat-resistant steel with Ni–Cr–B interlayer |
| title_full | Microstructure and mechanical properties of TLP-bonded 9CrMoCoB heat-resistant steel with Ni–Cr–B interlayer |
| title_fullStr | Microstructure and mechanical properties of TLP-bonded 9CrMoCoB heat-resistant steel with Ni–Cr–B interlayer |
| title_full_unstemmed | Microstructure and mechanical properties of TLP-bonded 9CrMoCoB heat-resistant steel with Ni–Cr–B interlayer |
| title_short | Microstructure and mechanical properties of TLP-bonded 9CrMoCoB heat-resistant steel with Ni–Cr–B interlayer |
| title_sort | microstructure and mechanical properties of tlp bonded 9crmocob heat resistant steel with ni cr b interlayer |
| topic | microstructure mechanical properties heat-resistant steel transient liquid phase bonding post weld heat treatment |
| url | https://doi.org/10.1088/2053-1591/ac6ec1 |
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