新型弹簧钢35SiMnB松驰抗力的研究

A STUDY OF SAG RESISTANCE OF NAW STEEL 35SiMnB FOR SUSPENSION LEAF SPRINGS

采用拉、压Bauschinger效应实验法、载荷松驰法和循环应力松驰法对新型弹簧钢35SiMnB松驰抗力及其临界区处理的影响进行了研究,并和常用弹簧钢60Si_2Mn进行了对比。结果表明:以迴线面积所表征的35SiMnB的松驰抗力略低于60Si_2Mn;但临界区热处理可以大幅度提高35SiMnB的迴线面积,同Bauschinger应变一样,迴线面积表征了相间应力或长程内应力的高低,循环变形量和载荷松驰量两个钢相当。文中对用迴线面积作为松驰抗力的表征参量的适用条件及迴线面积的测试方法提出了建议。

This paper summarizes a sytematic study aimed at revealling the sag resistance of a new low carbon steel 35SiMnB and the effect of intercriticasl treatment on it by using of tension and compression hysteresis loop area (HLA) and bauschinger effect (BE), also in the end contrast with 60Si_2Mn. the results show that the sag resistance manifested by HLA of 35SiMnB is lower than that of 60Si_2Mn, but the static load loss and cycle stress relaxation of 35SiMnB are almost the same as 60Si_2Mn. so it can be thought that the sag resistance of 35SiManB as satisfactory for the application to leaf spring. The phtsical significace of HLA was approached in the paper. The method measured HLA and conditions being suitable for using HLA to manifeste sag resistance were suggested.