Retardation of crack initiation and growth in austenitic stainless steels by laser peening without protective coating
Retardation of crack initiation and growth in austenitic stainless steels by laser peening without protective coating
复制标题
DOI：
10.1016/j.msea.2005.11.017
复制
发表时间：
2006-02-15
期刊：
影响因子：
6.4
通讯作者：
Ochi, Y
中科院分区：
文献类型：
--
作者：
Sano, Y;Obata, M;Ochi, Y
无保护涂层激光强化（LPPC）已应用于SUS304（304型）和SUS316L （316L型）奥氏体不锈钢的水浸强化。利用调q倍频Nd:YAG激光器，LPPC将两种材料的表面残余应力由拉伸转化为数百兆帕斯卡的压缩。LPPC后的残余压应力深度超过1 mm。高温和腐蚀水环境下的加速应力腐蚀开裂（SCC）试验表明，LPPC完全阻止了敏化SUS304的SCC萌生。对SUS304进行了预裂试样的SCC试验，结果表明LPPC抑制了小预裂的扩展。旋转弯曲试验表明，在10(8)次循环下，与参考材料相比，添加LPPC的SUS316L的疲劳强度提高了1.4-1.7倍。(c) 2005 Elsevier B.V.版权所有
Laser peening without protective coating (LPPC) has been applied to water-immersed SUS304 (Type 304) and SUS316L (Type 316L) austenitic stainless steels. The surface residual stress of both materials was converted from tensile to compressive of several hundreds of megapascals by LPPC with a Q-switched and frequency-doubled Nd:YAG laser. The depth of the compressive residual stresses after LPPC exceeded I mm from the surface. Accelerating stress corrosion cracking (SCC) tests in a high-temperature and corrosive-water environment showed that LPPC completely prevented the SCC initiation of sensitized SUS304. SCC tests of pre-cracked samples were also performed for SUS304, which indicated that LPPC inhibits the propagation of the small pre-cracks. Rotating bending tests demonstrated that the fatigue strength of SUS316L with LPPC is enhanced by 1.4-1.7 times compared to that of the reference material at 10(8) cycles. (c) 2005 Elsevier B.V. All rights reserved.