WANG Kai
,
XU Tingdong
,
SHAO Chong
,
YANG Chun
钢铁研究学报(英文版)
The data obtained by bending tests for intergranular embrittlement after 45 h and 450 h exposure to Strauss solution have been reported for 304 stainless steel. The results show that an embrittlement peak appears at 650 ℃ for all samples quenched from 1260 ℃ and then sensitized for 150 h at 480, 565, 650, 730, 815 and 900 ℃ respectively. The temperature corresponding to the embrittlement peak is decreased to 565 ℃ when the sensitizing time is prolonged to 1500 h. In this paper, these data are analyzed with an isothermal kinetic model of nonequilibrium grain boundary segregation, indicating that the embrittlement peak is related to the critical time for nonequilibrium grain boundary segregation of sulfur.
关键词:
stainless steel
,
intergranular corrosion
,
nonequilibrium segregation
,
grain boundary
,
sulfur
丁银贵，王静松，马赛，王广，薛庆国
钢铁
采用以铁精粉、煤粉和石灰石为主要原料制成含碳球团，在1573、1623、1673K下进行了不同加热时间的还原试验研究，并分析计算了炉料带入硫的去向。试验结果表明：在温度为1673K、12min时，渣铁已经能够很好的分离。所得珠铁中碳、硫的质量分数分别为3.53%和0.17%，珠铁的内部组织结构主要由珠光体和渗碳体组成。渣中以硅酸钙(CaSiO3)和硅酸二钙(Ca2SiO4)为主，含有少量的钙镁橄榄石(CaMgSiO4)和玻璃体。计算得知：炉料带入的硫中24.61%进入渣、61.91%进入铁、13.48%进入空气。
关键词:
含碳球团
,
iron nugget
,
slag
,
sulfur
