Curing damage in metallic materials by means of regenerative heat treatment

Translated from Metallovedenie i Termicheskaya Obrabotka Metallov, No. 4, pp. 7–12, April, 1995.     

一个金属材料高周疲劳损伤力学模型(英文)

基于不可逆热力学提出一个新的高周疲劳损伤力学模型,该模型考虑载荷频率对疲劳寿命的影响。模型中的参数H和c对于无频率效应的材料是常数,而对于有频率效应的材料则是与频率有关的函数。同时,讨论了不同应力比时模型的表达形式。利用AlZnMgCu1.5和AMg6N两种材料在不同频率下的疲劳实验数据验证提出的模型。结果表明,该模型能够准确预测材料在不同加载频率和应力比条件下的疲劳寿命。     

Laser-induced thermal damage detection in metallic materials via acoustic emission and ensemble empirical mode decomposition

A detection method of laser-induced thermal damage–surface burn, rehardening and residual stress, was studied in this work. Artificial thermal damage was produced to various steels, e.g., AISI 1045, ASTM A36 and AISI 304, by virtue of laser irradiation. The aim of the present work is to identify thermal damage through sensor and feature extraction techniques. Acoustic emission(AE) sensor and ensemble empirical mode decomposition(EEMD) method were employed for this purpose. A de-noising method was proposed to eliminate noises from original AE signals, based on EEMD. Quantified thermal damage features were obtained. Results evidenced a strong correlation between AE features, i.e., RMS value of the reconstructed acoustic emission signal, and surface burn, residual stress value, as well as hardness of steels. The present work could be used as a potential and indirect approach for thermal damage detection.     

金属材料中常见误读误用字词初谈

金属材料领域在化学元素(铬和RE)、钢铁牌号(Q和T)和学术名词(碳与炭、成型与成形以及淬火)中存在误读误用字词。中文已有的字、词,考究来源;英文翻译来的字、词,讲究达意。语言文字也要承载时代发展和科技进步,充分发挥其社会功能。