The Effect of Lath Martensite Microstructures on the Strength of Medium-Carbon Low-Alloy Steel
Different austenitizing temperatures were used to obtain medium-carbon low-alloy (MCLA) martensitic steels with different lath martensite microstructures. The hierarchical microstructures of lath martensite were investigated by optical microscopy (OM), electron backscattering diffraction (EBSD), and...
| Main Authors: | , , , , , |
|---|---|
| Format: | Article |
| Language: | English |
| Published: |
MDPI AG
2020-03-01
|
| Series: | Crystals |
| Subjects: | |
| Online Access: | https://www.mdpi.com/2073-4352/10/3/232 |
| _version_ | 1811298513832640512 |
|---|---|
| author | Chen Sun Paixian Fu Hongwei Liu Hanghang Liu Ningyu Du Yanfei Cao |
| author_facet | Chen Sun Paixian Fu Hongwei Liu Hanghang Liu Ningyu Du Yanfei Cao |
| author_sort | Chen Sun |
| collection | DOAJ |
| description | Different austenitizing temperatures were used to obtain medium-carbon low-alloy (MCLA) martensitic steels with different lath martensite microstructures. The hierarchical microstructures of lath martensite were investigated by optical microscopy (OM), electron backscattering diffraction (EBSD), and transmission electron microscopy (TEM). The results show that with increasing the austenitizing temperature, the prior austenite grain size and block size increased, while the lath width decreased. Further, the yield strength and tensile strength increased due to the enhancement of the grain boundary strengthening. The fitting results reveal that only the relationship between lath width and strength followed the Hall−Petch formula of. Hence, we propose that lath width acts as the effective grain size (EGS) of strength in MCLA steel. In addition, the carbon content had a significant effect on the EGS of martensitic strength. In steels with lower carbon content, block size acted as the EGS, while, in steels with higher carbon content, the EGS changed to lath width. The effect of the Cottrell atmosphere around boundaries may be responsible for this change. |
| first_indexed | 2024-04-13T06:21:19Z |
| format | Article |
| id | doaj.art-e5d46dc07ab14e3ca674353dfa36ea56 |
| institution | Directory Open Access Journal |
| issn | 2073-4352 |
| language | English |
| last_indexed | 2024-04-13T06:21:19Z |
| publishDate | 2020-03-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Crystals |
| spelling | doaj.art-e5d46dc07ab14e3ca674353dfa36ea562022-12-22T02:58:39ZengMDPI AGCrystals2073-43522020-03-0110323210.3390/cryst10030232cryst10030232The Effect of Lath Martensite Microstructures on the Strength of Medium-Carbon Low-Alloy SteelChen Sun0Paixian Fu1Hongwei Liu2Hanghang Liu3Ningyu Du4Yanfei Cao5Shenyang National Laboratory for Materials Science, Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016, ChinaShenyang National Laboratory for Materials Science, Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016, ChinaShenyang National Laboratory for Materials Science, Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016, ChinaShenyang National Laboratory for Materials Science, Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016, ChinaShenyang National Laboratory for Materials Science, Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016, ChinaShenyang National Laboratory for Materials Science, Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016, ChinaDifferent austenitizing temperatures were used to obtain medium-carbon low-alloy (MCLA) martensitic steels with different lath martensite microstructures. The hierarchical microstructures of lath martensite were investigated by optical microscopy (OM), electron backscattering diffraction (EBSD), and transmission electron microscopy (TEM). The results show that with increasing the austenitizing temperature, the prior austenite grain size and block size increased, while the lath width decreased. Further, the yield strength and tensile strength increased due to the enhancement of the grain boundary strengthening. The fitting results reveal that only the relationship between lath width and strength followed the Hall−Petch formula of. Hence, we propose that lath width acts as the effective grain size (EGS) of strength in MCLA steel. In addition, the carbon content had a significant effect on the EGS of martensitic strength. In steels with lower carbon content, block size acted as the EGS, while, in steels with higher carbon content, the EGS changed to lath width. The effect of the Cottrell atmosphere around boundaries may be responsible for this change.https://www.mdpi.com/2073-4352/10/3/232medium-carbon low-alloy steellath martensiteeffective grain sizestrengthcarbon content |
| spellingShingle | Chen Sun Paixian Fu Hongwei Liu Hanghang Liu Ningyu Du Yanfei Cao The Effect of Lath Martensite Microstructures on the Strength of Medium-Carbon Low-Alloy Steel Crystals medium-carbon low-alloy steel lath martensite effective grain size strength carbon content |
| title | The Effect of Lath Martensite Microstructures on the Strength of Medium-Carbon Low-Alloy Steel |
| title_full | The Effect of Lath Martensite Microstructures on the Strength of Medium-Carbon Low-Alloy Steel |
| title_fullStr | The Effect of Lath Martensite Microstructures on the Strength of Medium-Carbon Low-Alloy Steel |
| title_full_unstemmed | The Effect of Lath Martensite Microstructures on the Strength of Medium-Carbon Low-Alloy Steel |
| title_short | The Effect of Lath Martensite Microstructures on the Strength of Medium-Carbon Low-Alloy Steel |
| title_sort | effect of lath martensite microstructures on the strength of medium carbon low alloy steel |
| topic | medium-carbon low-alloy steel lath martensite effective grain size strength carbon content |
| url | https://www.mdpi.com/2073-4352/10/3/232 |
| work_keys_str_mv | AT chensun theeffectoflathmartensitemicrostructuresonthestrengthofmediumcarbonlowalloysteel AT paixianfu theeffectoflathmartensitemicrostructuresonthestrengthofmediumcarbonlowalloysteel AT hongweiliu theeffectoflathmartensitemicrostructuresonthestrengthofmediumcarbonlowalloysteel AT hanghangliu theeffectoflathmartensitemicrostructuresonthestrengthofmediumcarbonlowalloysteel AT ningyudu theeffectoflathmartensitemicrostructuresonthestrengthofmediumcarbonlowalloysteel AT yanfeicao theeffectoflathmartensitemicrostructuresonthestrengthofmediumcarbonlowalloysteel AT chensun effectoflathmartensitemicrostructuresonthestrengthofmediumcarbonlowalloysteel AT paixianfu effectoflathmartensitemicrostructuresonthestrengthofmediumcarbonlowalloysteel AT hongweiliu effectoflathmartensitemicrostructuresonthestrengthofmediumcarbonlowalloysteel AT hanghangliu effectoflathmartensitemicrostructuresonthestrengthofmediumcarbonlowalloysteel AT ningyudu effectoflathmartensitemicrostructuresonthestrengthofmediumcarbonlowalloysteel AT yanfeicao effectoflathmartensitemicrostructuresonthestrengthofmediumcarbonlowalloysteel |