Ultrasonic fatigue tests on maraging 300 steel: Under solution annealed, after aging heat treatment and under pre-corrosion attack

IF 3.2 Q2 MATERIALS SCIENCE, MULTIDISCIPLINARY Forces in mechanics Pub Date : 2024-01-01 DOI:10.1016/j.finmec.2023.100253

Julio A. Ruiz Vilchez , Gonzalo M. Domínguez Almaraz , Aymeric E. Domínguez

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Abstract

Ultrasonic fatigue tests were carried out under continuous cycling on the maraging 300 steel for the following conditions: (A) solution annealed (as received from supplier), (B) after aging heat treatment of 490 °C for 6 h, (C) after pre-corrosion attack, and (D) specimens loaded at 293 MPa at room temperature without failure until 1.0E+10 cycles. The ultrasonic fatigue strength of the four modalities were compared and discussed in regard the crack initiation inclusion, the heat treatment and the testing conditions. Crack initiation and propagation under this fatigue testing modality was analyzed; revealing that ultrasonic fatigue strength is related to internal TiN-inclusions and its parameters of shape and orientation, in regard the uniaxial applied load. Numerical simulations were carried out to investigate the stress concentration of an ellipsoidal void of 150 mm (longer radius), and a TiN ellipsoidal inclusion of same dimensions. In addition, SEM (Scanning Electron Microscope) analysis was carried out on the fracture surfaces to determine the crack initiation and propagation zones.

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马氏体时效 300 钢的超声波疲劳试验：固溶退火、时效热处理和预腐蚀条件下的超声波疲劳试验

在连续循环条件下对马氏体时效 300 钢进行了超声波疲劳试验，试验条件如下：(A) 固溶退火（供应商提供）；(B) 经过 490 °C 老化热处理 6 小时；(C) 经过预腐蚀处理；(D) 试样在室温下以 293 MPa 加载，直到 1.0E+10 循环才失效。对四种模式的超声波疲劳强度进行了比较，并就裂纹萌生的包含物、热处理和测试条件进行了讨论。分析了这种疲劳测试模式下的裂纹起始和扩展情况；结果表明，超声波疲劳强度与单轴施加载荷下的内部 TiN 杂质及其形状和取向参数有关。对 150 毫米（较长半径）的椭圆形空隙和相同尺寸的 TiN 椭圆形夹杂物的应力集中进行了数值模拟研究。此外，还对断裂表面进行了 SEM（扫描电子显微镜）分析，以确定裂纹的起始和扩展区域。

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