摘要
通过断口分析研究了含氮高锰奥氏体钢在超低温下的冲击断裂特性，探讨了其断裂机理。分析表明：穿晶脆断刻面是含氮高锰奥氏体钢的一种特有的断口形貌。由于合金元素和试验温度的影响，使钢的正断抗力Ｓ_（ＯＴ）小于切断抗力τ_ｋ，因此产生了穿晶断裂。断裂面是｛１１１｝_γ或孪晶界；当τ_ｋ和Ｓ_（ＯＴ）相近时，形成了各种复杂形貌的断口。氮量过高会导致钢产生穿晶脆断。
The impact fracture characters of high Mn austenitic steel with N are analyzed and the fracture mechanism is discussed by means of cryogenic temperature impact test and fractography.The transgranular facet is a kind of charactic fracture topography of high Mn austenitic steel with N. Due to the influence of alloy elements and the test temperature, the cleavage strength S_(oT) is less than the shearing strength τ_k, and therefore the transgranular brittle fracture is Produced. The fracture plane is the {111}_γor twin boundary.While τ_K and S(OT) are closely the same, various mixed fracture topographes are formed. More N content in austenitic steel results in the transgranular brittle fracture.
出处
《机械工程学报》
EI
CAS
CSCD
北大核心
1994年第3期14-18,共5页
Journal of Mechanical Engineering
关键词
穿晶脆断
奥氏体钢
断口形貌
Transgranular brittle fracture, Anstenitic steel, Fracture topography
