论文部分内容阅读
通过对不同硼含量、不同冶炼工艺的40MnB 钢石状断口的观察,分析了Fe_(23)(C,B)_6 相形成石状断口的机构,钢中微量 Ti 降低钢的过热敏感性的机理。证实含微量 Ti 的40MnB 钢的石状断口是由 Fe_(23)(C,B)_6 析出相所致。它是一种不稳定的石状断口,通过930℃普通正火就可以消除。钢中的微量 Ti 并不是通过阻止高温下奥氏体晶粒长大,而是通过抑制 MnS 的溶解和析出,消除了40MnB 钢断口小平面上二次 MnS 粒子的沉淀。
Through the observation of 40MnB steel fracture with different content of boron and different smelting process, the mechanism of the formation of stone fracture with Fe_ (23) (C, B) __6 phase was analyzed. The mechanism that Ti in steel reduced the overheat sensitivity of steel . It is confirmed that the fracture of 40MnB steel containing trace Ti is caused by the precipitation of Fe_ (23) (C, B) _6. It is an unstable stone-like fracture that can be eliminated by normalizing at 930 ° C. The trace Ti in steel does not prevent the precipitation of secondary MnS particles in the fracture facets of the 40MnB steel by preventing austenite grain growth at high temperatures by inhibiting the dissolution and precipitation of MnS.