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首页> 外文期刊>Journal of Materials Engineering and Performance >Cyclic Strain Resistance, Stress Response, Fatigue Life, and Fracture Behavior of High Strength Low Alloy Steel 300 M
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Cyclic Strain Resistance, Stress Response, Fatigue Life, and Fracture Behavior of High Strength Low Alloy Steel 300 M

机译：高强度低合金钢300 M的循环应变阻力，应力响应，疲劳寿命和断裂行为

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摘要

The focus of this technical manuscript is a record of the specific role of microstructure and test specimen orientation on cyclic stress response, cyclic strain resistance, and cyclic stress versus strain response, deformation and fracture behavior of alloy steel 300 M. The cyclic strain amplitude-controlled fatigue properties of this ultra-high strength alloy steel revealed a linear trend for the variation of log elastic strain amplitude with log reversals-to-failure, and log plastic strain amplitude with log reversals-to-failure for both longitudinal and transverse orientations. Test specimens of the longitudinal orientation showed only a marginal improvement over the transverse orientation at equivalent values of plastic strain amplitude. Cyclic stress response revealed a combination of initial hardening for the first few cycles followed by gradual softening for a large portion of fatigue life before culminating in rapid softening prior to catastrophic failure by fracture. Fracture characteristics of test specimens of this alloy steel were different at both the macroscopic and fine microscopic levels over the entire range of cyclic strain amplitudes examined. Both macroscopic and fine microscopic observations revealed fracture to be a combination of both brittle and ductile mechanisms. The underlying mechanisms governing stress response, deformation characteristics, fatigue life, and final fracture behavior are presented and discussed in light of the competing and mutually interactive influences of test specimen orientation, intrinsic microstructural effects, deformation characteristics of the microstructural constituents, cyclic strain amplitude, and response stress.
机译：该技术手稿的重点是记录微观结构和试样方向对300 M合金钢的循环应力响应，循环应变阻力以及循环应力与应变响应，变形和断裂行为的特定作用。循环应变幅度-这种超高强度合金钢的受控疲劳性能揭示了其对数弹性应变幅度随失效对数反转的线性趋势，以及对数塑性应变振幅随纵向和横向取向对数失效而变化的线性趋势。纵向取向的试样在塑性应变幅度的等效值下仅比横向取向略有改善。循环应力响应显示出在最初的几个循环中先开始硬化，然后在大部分疲劳寿命中逐渐软化，然后在断裂导致灾难性破坏之前迅速软化，最终达到快速软化的组合。在所考察的整个循环应变幅度范围内，该合金钢试样的断裂特性在宏观和精细微观水平上均不同。宏观和精细的显微镜观察都表明，断裂是脆性和延性机制的组合。结合试样方向，内在的微观结构效应，微观结构成分的变形特性，循环应变幅度，和反应压力。

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