摘要
以Q235和20g为研究对象,采用平板无缺陷拉伸试样。通过测量试样轴线上各点应变,将屈服问题深入到单点屈服的层面上,深入研究点屈服的力学行为及扩展规律。结果表明:低碳钢点屈服的力学行为基本相同,点应变曲线经历应变线性增加、剧增和基本稳定3个阶段,点屈服过程对应于应变剧增阶段;点屈服扩展则对应于应变稳定区;点屈服的力学行为具有3个典型特征:屈服应变大,一般在2×104μm以上;屈服过程持续时间短,一般从十几秒到几十秒不等;点屈服处的应变具有不均匀性。
Aiming at the micro-point＇s mechanical behaviour of low carbon steel, the static tension tests were applied to flee-defect plate base metal specimen. The strain measurement of different points were done on the specimen axial so as to obtain the yield and the expansion laws of micro-points. The results show that the mechanical behaviours under different low carbon steels are almost the same. The strain curve shape of micro-point experience three stages： the linearity, sharp increment and stable stages. Strain sharp increment reveals that the period of micro-point yield occurs at a micro point, the point yield ends when the strain increases to the stable strain value and the stable stage reveals the process of micro-point yielding expansion. The characteristics of point yield are that the large plastic strain value which is usually larger than 2×104μm. The time-continuing process of the point yield is very short, which ranges from a few seconds into tens of seconds. The strain value is uneven at the location of the yield point.
出处
《热加工工艺》
CSCD
北大核心
2014年第10期64-66,共3页
Hot Working Technology
基金
安徽高校省级自然科学研究项目(KJ2013B084)
安徽科技学院青年基金项目(ZRC2013336)
安徽科技学院自然科学研究项目(ZRC2013384)
关键词
低碳钢
静载拉伸
点屈服
剧增区
稳态区
low carbon steel
static tension
micro-point yield
strain sharp increment
stable strain values region
