α—Fe 中氢致软化同氢致硬化与氢的状态间的关系

RELATIONSHIP BETWEEN HYDROGEN SOFTEN—ING OR HYDROGEN HARDENING AND THE STATE OF HYDROGEN IN α-Fe

1 引言α-Fe 充氢后既不产生氢化物,也不能在表面形成有效的保护膜,此外很多作者还指出α-Fe 单晶没有不可逆氢脆现象,所有这些都应是讨论α-Fe 中氢时的基本出发点。由于氢能在室温下自由地跑出试样表面,故将氢的状态总地分成室温稳定(RTS)同室温非稳定(RTU)的两部分不无道理。在文献〔5〕中我们又成功地将退火α-Fe同脱C,N α-Fe 的氢致软化(HS)同氢致硬化(HH)现象分成晶内(CL)同晶界(GB)

The states of hydrogen in α-Fe can be divided into twokinds as a whole,one is room temperature stable state,the other is roomtemperature unstable state.The hydrogen softening or hydrogen hardening ofcrystal lattice is mainly determined by the room temperature unstable compo-nent,while that of grain boundary is mainly determined by the room tempe-rature stable component.Such a rule is independent of the C+N content inα-Fe.