于壮壮,滕全全,张俊美,秦超,徐智宝,有移亮

• 1:中国兵器工业第五二研究所烟台分所有限责任公司
• 2:北京航空航天大学材料科学与工程学院

摘要(Abstract)：

采用化学成分检测、显微组织和裂纹形貌观察、扫描电镜(SEM)及能谱仪(EDS)等对20CrMo活塞缸体经渗碳淬火处理后裂纹产生的原因进行分析。结果表明:20CrMo活塞缸体的裂纹性质为淬火裂纹,该缸体同时出现两种淬火裂纹,即穿晶大裂纹和沿晶微裂纹;穿晶大裂纹主要分布在镗孔直径突变的台阶处,裂纹断口呈解理形貌;微裂纹主要分布在缸体镗孔内壁表面,其特征为沿奥氏体晶界扩展、尾端尖细并伴随沿晶二次裂纹,裂纹两侧显微组织无氧化脱碳现象。综合分析认为碳元素含量超标及表面渗碳工艺增大了缸体淬裂倾向;缸体孔内径突变处易形成应力集中,穿晶大淬火裂纹与淬火冷速过快有关;奥氏体化温度过高易导致晶界弱化,并在微观组织应力作用下在缸体内壁诱发淬火沿晶微裂纹。

关键词(KeyWords)： 缸体;裂纹模式;穿晶解理;淬火裂纹;沿晶开裂

Abstract:

Keywords:

基金项目(Foundation):

作者(Author): 于壮壮,滕全全,张俊美,秦超,徐智宝,有移亮

DOI: 10.13289/j.issn.1009-6264.2024-0398

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