超高氮奥氏体钢的韧脆转变

钢铁, 2008, 43(2): 89-0.

超高氮奥氏体钢的韧脆转变

1.1. 昆明理工大学机电工程学院，云南昆明 650093；2. 钢铁研究总院结构材料研究所，北京 100081

1.1. Faculty of Mechanical and Electrical Engineering， Kunming University of Science and Technology， Kunming 650093， Yunnan, China

2.2. Institute for Structural Materials, Central Iron and Steel Research Institute, Beijing 100081, China

关键词：夏比冲击试验;高氮奥氏体钢;韧脆转变;似解理断裂

Ductile to Brittle Transition of SuperHigh Nitrogen Austenitic Stainless Steel

MA Yuxi , RONG Fan , ZHOU Rong , LANG Yuping , JIANG Yehua

Keywords： Charpyimpact test;superhigh nitrogen austenitic stainless steel;ductile to brittle transition;cleavagelike fracture

在-60 ℃至室温范围内，采用夏比冲击试验测定材料的韧脆转变温度（DBTT），并通过对冲击断口的扫描电镜（SEM）观察和透射电镜（TEM）观察等方法，对几种不同氮含量奥氏体不锈钢在低温下发生韧脆转变的现象进行了研究。结果表明：在Charpy冲击试验中,除大量高密度位错和层错外未发现奥氏体基体结构的变化，随温度的降低，其断口形貌由韧窝→韧窝和似准解理→似解理脆断变化，断裂形式为以穿晶为主的混合断裂。

The DBTT of superhigh nitrogen containing austenitic stainless steel was measured by Charpy impact test from roomtemperature to -60 ℃ , and the ductility and brittleness transition at low temperature was investigated by SEM, TEM and XRD methods. The results show that except a lot of fault ribbons and high density dislocations the structure of austenitic matrix is not changed during Charpytype test.The fracture is changed from dimple to dimple and cleavagelike to cleavagelike, and fracture mode is a mixed one with transgranular as primary.

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