Abstract

This study investigates and compares the effects of different shot peening treatments including conventional and severe shot peening on microstructure, mechanical properties, fatigue behavior, and residual stress relaxation of AISI 1060 steel. Shot peening treatments were applied with two Almen intensities of 17 and 21 A and a wide ranges of coverage (100%–1500%). Various microstructural observations were carried out to analyze the evolution of microstructure. Microhardness, residual stress and surface roughness measurements and also axial fatigue test were performed. Moreover, the extent of the residual stress relaxation during cyclic loading was investigated by means of XRD measurements. Furthermore, numerical simulation of residual stress relaxation due to fatigue loading was carried out and validated against experimental investigations. The comparison indicated a good agreement for the surface residual stress relaxation up to 100 cycles. The experimental results indicated the efficiency of severe shot peening processes in obtaining nanostructured surface layer and achieving superior mechanical properties and fatigue behavior. Also, residual stress measurements revealed that stress relaxation started with a high rate at the initial stages of loading and gradually increased at higher number of cycles which was lower in the case of severely shot peened samples compared to the conventionally treated ones.

Graphic Abstract

中文翻译：

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常规和严重喷丸处理对AISI 1060钢残余应力和疲劳强度以及疲劳载荷引起的残余应力松弛的影响：实验和数值模拟

摘要

本研究调查并比较了不同的喷丸处理方法，包括常规喷丸处理和严重的喷丸处理，对AISI 1060钢的组织，力学性能，疲劳行为和残余应力松弛的影响。喷丸处理采用两种Almen强度17和21 A，覆盖范围广（100％–1500％）。进行了各种微观结构观察，以分析微观结构的演变。进行了显微硬度，残余应力和表面粗糙度的测量以及轴向疲劳试验。此外，通过XRD测量研究了循环加载过程中残余应力松弛的程度。此外，进行了疲劳载荷导致的残余应力松弛的数值模拟，并通过实验研究进行了验证。比较表明，表面残余应力松弛达到100次循环时，一致性良好。实验结果表明，严格的喷丸硬化工艺可有效获得纳米结构表面层，并具有出色的机械性能和疲劳性能。另外，残余应力测量结果表明，应力松弛在加载的初始阶段以较高的速率开始，并在较高的循环次数下逐渐增加，与常规处理的试样相比，在经严重喷丸处理的样品中应力松弛更低。实验结果表明，严格的喷丸硬化工艺可有效获得纳米结构表面层，并具有出色的机械性能和疲劳性能。另外，残余应力测量结果表明，应力松弛在加载的初始阶段以较高的速率开始，并在较高的循环次数下逐渐增加，与常规处理的试样相比，在严重喷丸处理的试样中，应力松弛程度较低。实验结果表明，严格的喷丸硬化工艺可有效获得纳米结构表面层，并具有出色的机械性能和疲劳性能。另外，残余应力测量结果表明，应力松弛在加载的初始阶段以较高的速率开始，并在较高的循环次数下逐渐增加，与常规处理的试样相比，在严重喷丸处理的试样中，应力松弛程度较低。

图形摘要