Theoretical analyses have shown that boron benefits precipitation strengthening, solution strengthening and grainboundary strengthening.
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。
2
The authors suggest that the primary factors of the reheat embrittlement are precipitation of coarse carbide along the grainboundary and secondary hardening in the grain.
出现再热脆性的主要原因是晶界粗大碳化物的析出和晶内二次硬化。
3
The analysis show that the main reason to easy erode austenite grainboundary after tempering is the precipitation situation of carbide.