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600MPa级汽车大梁钢疲劳极限确定和疲劳断裂原因分析
引用本文:卢军辉,刘家琪,仇圣桃,干勇.600MPa级汽车大梁钢疲劳极限确定和疲劳断裂原因分析[J].科学技术与工程,2020,20(1):135-140.
作者姓名:卢军辉  刘家琪  仇圣桃  干勇
作者单位:钢铁研究总院连铸技术国家工程研究中心,钢铁研究总院连铸技术国家工程研究中心,钢铁研究总院连铸技术国家工程研究中心,钢铁研究总院连铸技术国家工程研究中心
摘    要:为确定FTSR(Flexible Thin Slab Rolling,薄板坯连铸连轧)短流程生产线生产600MPa级汽车大梁钢是否满足装车要求,利用升降法研究了汽车大梁钢的疲劳性能,发现采用对数试验应力-对数疲劳寿命拟合优于直接采用实验应力-疲劳寿命,计算得到不同存活率下的P-S-N曲线,由图得到疲劳极限强度为294MPa,经过数值计算得到的疲劳极限强度为287.1MPa。采用SEM对疲劳试样进行断口分析,发现疲劳断裂为韧性断裂,夹杂物为裂纹的起源,结合性能指标和装车试用确认,FTSR生产线开发的600MPa级汽车大梁钢满足装车使用要求。

关 键 词:汽车大梁钢  升降法  疲劳极限强度  疲劳辉纹
收稿时间:2019/5/14 0:00:00
修稿时间:2019/9/6 0:00:00

Determination of Fatigue Limit and Analysis of Fatigue Fracture of 600MPa Automobile Frame Steel
Institution:National Engineering Research Center of Continuous Casting Technology, CISRI, Beijing 100081, China,,,
Abstract:The 600MPa class steel for automotive frame have developed on Flexible Thin Slab Rolling line, and then fatigue performance of this steel was studied by using up-and-down method. It was found that lgS-lgN fitting was better than S-N fitting, and P-S-N curves under different survival rates were calculated. The fatigue limit obtained through accurate calculation is 287.1MPa .The fatigue fracture was analyzed and observed, and it was found that the fatigue fracture was ductile fracture and the inclusion was the original of the crack source. So the developed steel can meet with the operating requirement by combined with performance indicators and loading trial.
Keywords:automobile frame steel  up-and-down method    fatigue ultimate strength  fatigue striations
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