在从单向拉伸到双向等应力拉伸的应力状态范围内进行了球化高碳钢薄板氢脆的研究．测定断口处局部断裂应变表明，在双向等应力拉伸中氢所引起的塑性损失最大．金相和断口检测结果表明，充氢和未充氢材料的断裂都是空洞形核，空洞长大，和空洞连通的结果。氢加速这三个塑性断裂过程，特别是在双向等应力拉伸应力状态下，氢的影响更为显著本文对此进行了较全面的讨论。
The hydrogen embrittlement of a spheroidized high carbon steel sheet has been investigated over a range of stress states from uniaxial to equibiaxial tension. For a given stress state, data based on locally determined fracture strains show a decrease in ductility for cathodically charged specimens compared with the corresponding uncharged condition. The loss of ductility caused by hydrogen increases with an increasing degree of biaxiality of the stress state. Metallographic and fractographic examinations show that the fracture of both charged and uncharged sheets is a consequence of void nucleation (due to the decohesion between carbide particles and ferrite matrix),void growth,and void link─up. These fracture processes are accelerated by hydrogen,especially in equibiaxial tension. The above results are discussed in terms of previously proposed modles and postulated mechanisms in steels.Correspondent: FAN Yunchang, senior engineer, Institute of Materials Science and Engineering, Shijiazhuang Railway institute, Shijiazhuang 050043
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