摘要
首次获得了具有粒状碳化物的莱氏体型铸造模具钢，解决了Ｃｒ１２类钢精密成型模具强韧性低的问题。试验结果表明：该新型铸造模具钢基体组织是以位错马氏体为主，含少量李晶马氏体和残留奥氏体；其碳化物形态不同于传统莱氏体型铸造模具钢的网状碳化物，在不同截面尺寸下均呈粒状均匀分布；在硬度为ＨＲＣ６０～６２时，其冲击韧性明显高于传统莱氏体型铸造模具钢，已达到锻造Ｃｒ１２类钢的下限值；其断裂韧性和疲劳裂纹扩展抗力明显高于传统莱氏体型铸钢和锻造Ｃｒ１２类钢；具有高的耐磨性。并进行了现场应用试验。
A new type of ledeburite cast die steel with granular carbide is achieved for the first time, which solves the problem of low strength and toughness of precision cast Cr 12 type steel. The results show that the matrix of the new type cast steel is dislocation martensite with a few of twin martensite and retained austenite, whose carbide morphology, different from that of the conventional ledeburite cast die steel, is in an evenly-distributed granular form in different section dimensions. At HRC 60 - 62, its impact toughness, higher than that of the conventional ledeburite cast steel, reachs the lower limit of impact toughness. The new type of cast steel also has obviously higher fracture toughness and resistance to fatigue crack propagation than the conventional ledeburite cast steel and forged Cr 12 type steel, and retains high wear resistance. Furthermore, the on-the-spot utilization test is carried out for the new type of ledeburite cast die steel.
出处
《吉林工业大学自然科学学报》
CSCD
2000年第2期33-37,共5页
Natural Science Journal of Jilin University of Technology
基金
国家自然科学基金资助项目!(59771003)
关键词
莱氏体钢
粒状碳化物
组织
性能
铸造模具钢
ledeburite steel
cast die
granular carbide
microstructure
properties
