同时，晶界沉淀物的端部由尖锐变得圆钝，晶界临近区域中的合金元素贫化，使材料的应力腐蚀抗力提高。
Meanwhile, the tip of precipitates along grain boundary becomes obtuse, the alloying elements are depleted in the region near the grain boundary and the stress corrosion resistance is bettered.
理论分析表明：硼对沉淀强化、固溶强化和晶界强化均有贡献。
Theoretical analyses have shown that boron benefits precipitation strengthening, solution strengthening and grain boundary strengthening.
热机影响区晶粒沿流线方向拉长且有细小沉淀相在晶界上析出；
The grains are elongated along deformation lines and small precipitations occur in grain boundary of the TMAZ.
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