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Effect of Shot Peening Time on Δ/γ Residual Stress Profiles of AISI 304 Weld

Hsuan-Han Lai, Hao-Chun Cheng, Chen-Yu Lee,Chi-Ming Lin,Weite Wu

Journal of Materials Processing Technology(2020)SCI 1区SCI 2区

Natl Chung Hsing Univ

Cited 16|Views27
Abstract
delta ferrite and residual stress are known to affect the corrosion behavior of AISI 304 stainless steel welds. To improve the corrosion resistance of a weld, shot peening is often carried out. This study aimed to investigate the effect of shot peening time on the residual stress evolution in both delta ferrite and gamma austenite in a 304 stainless steel weld. The residual stresses of both delta and gamma phases were significantly transformed from tensile to compressive after shot peening, and in addition, their surface residual stress deviations were lowered as the peening time increased. The stress versus depth profiles revealed a distinct plastic zone and an effective peening depth. The full width at half maximum (FWHM) of both phases increased as the peening time increased, but that of delta reached to a near stable value at peening 4 min. The FWHM change might be an index of surface coverage of peening, depending on the alloy phases. The electrochemical testing showed that shot peening effectively reduced the corrosion current intensity (I-co(rr)) of the weld to a lower value than that in welds peened by other processes. Both the grain refinement and compressive stress enhanced the corrosion resistance of the weld.
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Key words
Shot peening,delta Ferrite,Residual stress,FWHM,Corrosion current intensity
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要点】:该论文研究了喷丸时间对AISI 304不锈钢焊接接头中δ铁素体和γ奥氏体残余应力演变的影响,发现喷丸处理能显著转变残余应力,并降低表面残余应力偏差,延长了腐蚀阻力。

方法】:通过实验测量了不同喷丸时间下焊接接头的残余应力,并进行了电化学测试。

实验】:实验结果表明,喷丸时间延长使两种相的 full width at half maximum (FWHM) 增大,δ相在喷丸4分钟后达到稳定值;喷丸处理有效降低了焊接接头的腐蚀电流强度,细化晶粒和压缩应力提高了焊接接头的耐腐蚀性。使用的数据集未在摘要中提及。