1500 MPa級高強度鋼42CrMoVNb的氫吸附行為HYDROGEN ABSORPTION BEHAVIOR OF 1500 MPa--GRADE HIGH STRENGTH STEEL 42CrMoVNb
采用陰極充H和H熱分析等實驗方法, 研究了新開發(fā)的1500 MPa級高強度鋼 42CrMoVNb在不同奧氏體化溫度淬火和不同溫度回火后的H吸附行為, 并與常用鋼42CrMo進行了對比. 結果表明, 在淬火態(tài)及不同溫度回火處理后, 42CrMoVNb鋼充H試樣的H逸出曲線峰值溫度$\theta_{\rm p}$在200---250 ℃之間. 回火溫度從200 ℃升高到500 ℃時, 充H試樣的H含量緩慢增加; 當回火溫度升高到 500 ℃以上時, 充H試樣的H含量急劇增加, 并且在600 ℃附近達到最高值 6.6×10-6左右, 該H含量約為淬火態(tài)時的5倍; 繼續(xù)提高回火溫度, 則H含量又急劇下降. 在不同奧氏體化溫度(850-1100 ℃)加熱淬火, 經(jīng)400 ℃回火時, 沒有細小彌散的(V,?X)C碳化物析出, 因而充H試樣的H含量隨奧氏體化溫度升高的變化不明顯; 而在有細小(V,?X)C析出的峰值溫度600 ℃回火時, H含量則隨奧氏體化溫度的升高而明顯增加. 這表明, 細小彌散的(V,?X)C碳化物可作為H陷阱而吸附大量的H. 通過改變升溫速率測定(V,?X)C析出相的H陷阱激活能Ea=28.7 kJ/mol.
| Hydrogen absorption behaviors of a newly developed 1500 MPa-grade high strength steel 42CrMoVNb at different austenitizing temperatures and tempering temperatures were studied using cathodic charging and hydrogen thermal desorption analysis, which were also compared with commercial structural steel 42CrMo. The results show that the hydrogen escape peak temperatures (θp) in hydrogen evolution curves of hydrogen charged 42CrMoVNb specimens are between 200 ℃ to 300 ℃ both at as-quenched condition and as-tempered condition. The absorbed hydrogen content of 42CrMoVNb specimen increases slowly with increasing tempering temperature up to 500 ℃. When the tempering temperature exceeded 500 ℃, the absorbed hydrogen content increases sharply and reaches its peak, 6.6×10-6, for the specimen tempered at 600 ℃, which is 5 times as much as that of the as-quenched specimen. Thereafter the absorbed hydrogen content declines sharply as the tempering temperature was gone up sequentially. When the specimen was tempered at 400 ℃, the absorbed hydrogen content decreases slightly with austenitizing temperature increasing, and in the microstructure no fine dispersed (V,?X)C carbide precipitated, while when the specimen was tempered at 600 ℃, the absorbed hydrogen content increases sharply with austenitizing temperature increasing, and more fine dispersed (V,?X)C precipitated. These results indicate that fine dispersed (V,?X)C precipitate could? be regarded as a strong hydrogen trap, and the trap activation energy,?Ea, is equal to about\linebreak 28.7 kJ/mol, which was obtained by change heating rate. |
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