450 MPa级汽车用高强无间隙原子钢的低温脆性  

Low temperature brittleness of 450 MPa high-strength gapless atomic steel for automobiles

作　　者：冯帆 FENG Fan(Shandong Iron and Steel Group Rizhao Co.,Ltd.,Rizhao 276800,China)

机构地区：[1]山东钢铁集团日照有限公司,日照276800

出　　处：《理化检验（物理分册）》2024年第11期6-10,共5页Physical Testing and Chemical Analysis(Part A:Physical Testing)

摘　　要：为探究高强无间隙原子钢的低温脆性,对不同批次的450 MPa级高强无间隙原子钢进行二次加工脆化试验。结果表明:样杯边部粗糙度越大,材料的二次加工脆化温度越高;适当提高B元素含量,可有效提高材料的抗低温冲击性能,当B元素质量分数为0.001 2%,样杯边部粗糙度为0.3μm时,二次加工脆化温度小于-60℃。To investigate the low temperature brittleness of high-strength gapless atomic steel,secondary processing embrittlement tests were conducted on different batches of 450 MPa high-strength gapless atomic steel.The results show that the larger the roughness of the sample cup edge,the higher the secondary processing embrittlement temperature of the material.Appropriately increasing the content of B element could effectively improve the low temperature impact resistance of materials.When the mass fraction of B element was 0.001 2% and the roughness of the sample cup edge was 0.3 μm,the secondary processing embrittlement temperature was less than-60 ℃.

关 键 词：高强无间隙原子钢 低温脆性 二次加工脆化温度 粗糙度 B元素 

分 类 号：TB31[一般工业技术—材料科学与工程] TG115.2[金属学及工艺—物理冶金]