30Si2MnCrMoVE钢氮基气氛热处理氢脆问题

Hydrogen Embrittlement in Nitrogen-Based Atmosphere Heat Treatment for 30Si2MnCrMoVE

研究了超高强度钢30Si2MnCrMoVE在密封箱式多用炉热处理生产线中采用普氮+甲醇(N2+CH3OH)氮基气氛热处理的氢脆问题。结果表明:30Si2MnCrMoVE在H2≤3%氮基气氛中热处理,其力学性能、断裂韧性、金相组织及断口形貌与普通热处理一样,无氢脆倾向。此外还发现热处理时采用氮基气氛保护,尽管表面不产生氧化皮,改善了表观质量,但仍有脱碳现象。

This paper studies the hydrogen embrittlement of ultra-high-strength steel 30Si2MnCrMoVE in nitrogen and methanol nitrogen-based atmosphere heat treated with the sealing box multi-purpose furnace in heat treatment production line.The results show that the mechanical properties,fracture toughness,microstructure and fracture morphology in nitrogen-based atmosphere heat treated with H2 ≤ 3 ％ nitrogen are the same as the ordinary heat treatment.No hydrogen embrittlement tendency has been found.Although the nitrogen-based atmosphere heat treatment improved the apparent quality,the 30Si2MnCrMoVE stil exist decarburization phenomenon.