张贤忠,陈庆丰,周桂峰,熊玉彰,蔡启舟

• 1:武钢研究院
• 2:华中科技大学材料成型与模具技术国家重点实验室

摘要(Abstract)：

对比研究了V-N微合金钢、C70S6BY两种汽车发动机裂解连杆用钢的疲劳强度、疲劳断口形貌和疲劳裂纹形成机理。结果表明,V-N微合金钢的中值疲劳强度σ-1约为400 MPa,优于C70S6BY钢的疲劳极限。V-N微合金钢的疲劳裂纹萌生于试样表面的铁素体-珠光体边界,并沿着铁素体-珠光体边界及珠光体内部扩展,疲劳断口呈韧窝状,属韧性断裂。C70S6BY中先共析铁素体呈薄片状断续分布在珠光体周围,疲劳裂纹在晶界铁素体处萌生及扩展,疲劳断口呈解理状,属脆性疲劳断裂。

关键词(KeyWords)： 疲劳性能;V-N微合金钢;断裂

Abstract:

Keywords:

基金项目(Foundation):

作者(Author): 张贤忠,陈庆丰,周桂峰,熊玉彰,蔡启舟

DOI: 10.13289/j.issn.1009-6264.2014.s2.018

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