• 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>Materials Science and Engineering >Effect of mean stresses on mode of failures and fatigue life of selective laser melted stainless steel
【24h】

Effect of mean stresses on mode of failures and fatigue life of selective laser melted stainless steel

机译：平均应力对选择性激光熔炼不锈钢失效模式和疲劳寿命的影响

获取原文
获取原文并翻译 | 示例
           
页面导航
  • 摘要
  • 著录项
  • 相似文献
  • 相关主题

摘要

In today's era of modem manufacturing, selective laser melting is getting increasingly popular due to its capability of producing geometrically complex parts directly from CAD model in a single step. Few papers have reported the fatigue behaviour of selective laser sintered stainless steel specimens. In the present study, effect of tensile, zero and compressive mean stresses on mode of failures and fatigue strength of laser sintered 15-5 precipitation hardened stainless steel specimens have been investigated. Presence of compressive mean stress is found to improve the fatigue life while tensile mean stress is found to be detrimental. For tensile and compressive mean stresses, fracture surfaces show four distinct regions: crack initiation site, stable crack growth region, unstable crack growth region and fracture region. However, under zero mean stress fracture surfaces do not show any unstable crack growth region. Unstable crack growth region could be attributed to presence of mean stresses. Predominant mode of failure for compressive mean stress is brittle. Presence of tensile mean stress leads to fracture surface having brittle and mixed-rupture characteristics of quasi-cleavage and dimples respectively; whereas under zero mean stress fracture surface shows ductile-brittle mixed mode of failure.
机译：在当今的调制解调器制造时代，选择性激光熔化由于能够直接从CAD模型直接生产几何形状复杂的零件而变得越来越流行。很少有论文报道选择性激光烧结不锈钢试样的疲劳行为。在本研究中，已经研究了拉伸，零和压缩平均应力对激光烧结15-5沉淀硬化不锈钢试样的破坏模式和疲劳强度的影响。发现压缩平均应力的存在改善了疲劳寿命，而拉伸平均应力被发现是有害的。对于拉伸和压缩平均应力，断裂表面表现出四个不同的区域：裂纹萌生部位，稳定的裂纹扩展区域，不稳定的裂纹扩展区域和断裂区域。但是，在平均应力为零的情况下，断裂表面不会出现任何不稳定的裂纹扩展区域。裂纹扩展区域不稳定可能归因于平均应力的存在。压缩平均应力的主要失效模式是脆性的。拉伸平均应力的存在导致断裂面具有脆性和准断裂和凹痕的混合断裂特性。而在平均应力为零的情况下，断裂面表现出韧性-脆性混合破坏模式。

著录项

相似文献

  • 外文文献
  • 中文文献
  • 专利
获取原文

客服邮箱：kefu@zhangqiaokeyan.com

京公网安备：11010802029741号 ICP备案号：京ICP备15016152号-6 六维联合信息科技 (北京) 有限公司©版权所有

  • 客服微信

  • 服务号