sensitization range是什么意思？ intergranular attack ("iga") may occur when carbon in the alloy has combined with chromium to form chromium carbides. these carbides tend to form when the material is exposed to temperatures within the range of 900° to 1500°f, such as may occur in welding. this is known as the "sensitization range." prolonged exposure to temperatures within the sensitization range produces substantial formation of chromium oxides. the oxide molecules precipitate or gather at the grain boundaries, forming a "network" of carbides. these carbide chains are hard, and may embrittle the metal. in addition, the supply of chromium atoms at the metal surface becomes depleted, so that there is not enough chromium to form an effective passive layer. material in this condition is considered "sensitized" and is susceptible to intergranular corrosion. in the extreme case, the sensitized material may simply crumble or disintegrate when exposed to mildly corrosive environments. http:///o-metallurgy.asp 中文资料建议搜索 晶间腐蚀 敏化温度查看更多
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