108.高锰钢铸件为什么最易产生裂纹?其化学成分对铸件产生裂纹有什么影响? 答:由于钢种的含锰高,使其热膨胀冷收缩大,而导热性能又差。加上碳含量也高,形成硬脆的(Fe、Mn)_3C又多,还有含磷量也高,冷裂倾向大。这些因素都使铸件在铸态下内应力大、强度低、裂纹敏感性大而易裂。 含碳≥1.35％,含磷≥0.09％的铸态高锰钢极 108 high manganese steel castings are the most likely to cause cracks? The chemical composition of cracks on the cast have any effect? ​​A: Due to the high manganese content of steel, so that its thermal expansion cold shrinkage, and poor thermal conductivity. Coupled with high carbon content, the formation of hard and brittle (Fe, Mn) _3C and more, but also high phosphorus content, cold cracking tendency. These factors make the castings in the as-cast internal stress, low strength, crack sensitivity and easy to crack. Carbon steel ≥ 1.35%, phosphorus ≥ 0.09% of the cast high manganese steel pole