元亚莎,殷立涛,王文焱,石如星,元莎,王九花,张玉栋,谢敬佩

• 1:河南科技大学材料科学与工程学院
• 2:洛阳中重铸锻有限责任公司
• 3:河南省大型铸锻件工程技术研究中心
• 4:中国机械总院集团北京机电研究所有限公司

摘要(Abstract)：

通过高温拉伸试验研究了新型Cr-Mo-V钢的高温断裂行为，探究不同拉伸温度(25～700℃)下试验钢的热力耦合区(断裂区)和热应力区(夹持区)的组织演变和碳化物分布特征，揭示钢中碳化物的种类、分布及尺寸与高温断裂行为之间的关系，阐明新型Cr-Mo-V热作模具钢在高温变形过程中裂纹附近显微组织的演化机制。结果表明：随着拉伸温度的升高，试验钢的抗拉强度和屈服强度降低，伸长率和断面收缩率升高，断裂方式由脆性断裂向韧性断裂转变，脆性断裂向韧性断裂的转变温度约为400℃;在高温变形过程中，试验钢的位错密度降低，回火马氏体发生分解、回复、再结晶及晶粒长大，M_7C_3和M_(23)C_6碳化物沿晶界析出长大，少量的细小颗粒状MC碳化物在晶内弥散分布；由于外力作用对变形区做功将导致变形区温度高于拉伸温度，这为断口附近细小碳化物回溶、大尺寸碳化物的长大提供热力学条件，导致热力耦合区小尺寸碳化物减少，大尺寸碳化物增多。

关键词(KeyWords)： Cr-Mo-V钢;热作模具钢;高温拉伸;组织演变;碳化物

Abstract:

Keywords:

基金项目(Foundation): 洛阳市重大科技创新专项(2301020A);; 河南省重大科技创新专项(221100230200)

作者(Author): 元亚莎,殷立涛,王文焱,石如星,元莎,王九花,张玉栋,谢敬佩

DOI: 10.13289/j.issn.1009-6264.2023-0442

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