采用α粒子径迹法和电子显微镜对含18 ppm B,19 ppm N,0.1％C-Si-Mn钢中硼化物的析出行为进行了详细研究。试样在固溶处理后水冷甚至冰盐水冷却时都观察到奥氏体晶界有碳硼化物Fe_(23)(C,B)_6析出,快速冷却时沿晶界析出的化合物呈薄板状,易溶于酸。当冷速为20℃/s时,除晶界有Fe_(23)(C,B)_6析出外,晶内也有Fe_(23)(C,B)_6析出。冷却过程中在750℃恒温处理时晶界和晶内的Fe_(23)(C,B)_6都急剧长大;在850℃恒温处理时BN以MrS为结晶核心在其周围析出,呈MnS+BN复合体形态。
The boride precipitation behaviour of steel containing B 18 ppm, N 19ppm and C 0.1% during cooling has been investigated by using the fission track etching and electron microscopy. It was found that the carbon-boride Fe_(23)(C, B)_6 precipitates out along the austenitic grain boundary of solid solution treatment specimen after water cooled even in iced salt water. The Fe_(23)(C, B)_6 appears an acid soluble thin plate on rapid cooling. At the cooling rate up to 20℃/s, the precipitate is further presented in the interior of the grain. Both intergranular and intragranular ones may quickly grow up by isothermal treatment at 750℃. While the isothermal treating temperature raised to 850℃, the boride, to form BN instead, precipitates out around the spherical MnS grain as nucleus of crystallization to obtain a compound of MnS+BN.
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