The influence of the second thermal cycle on coarse grained zone (CGHAZ) toughness of X70 steel is studied by weld thermal simulation test, scanning electron microscope and electron microprobe. The results show that ...The influence of the second thermal cycle on coarse grained zone (CGHAZ) toughness of X70 steel is studied by weld thermal simulation test, scanning electron microscope and electron microprobe. The results show that the CGHAZ toughness is improved after the second thermal cycle but being heated during the intercritical HAZ (ICHAZ). The CGHAZ toughness decreases evidently after being heated during partially transformed zone, which chiefly results from the carbon segregation to the grain boundaries of primal austenite, thus forming high carbon martensite austenite (M A) constituent and bringing serious intercritically reheated coarse grain HAZ (IRCGHAZ) embrittlement.展开更多
The relationship between the t8/5 and micro-hardness, impact toughness in the heat affected zone （HAZ） of ASME SA213-792 at peak temperature of 1 350 ℃ was studied by thermal simulation. The result shows that the m...The relationship between the t8/5 and micro-hardness, impact toughness in the heat affected zone （HAZ） of ASME SA213-792 at peak temperature of 1 350 ℃ was studied by thermal simulation. The result shows that the micro-hardness of HAZ rises at the beginning and then decreases with increasing of t8/5 , whereas the impact toughness presents reverse trend. The distribution of precipitates in substrate has great influence on the impact toughness of HAZ. When the t8/5 is 40 s, chain-like precipitates lower the impact toughness of HAZ seriously.展开更多
甲板上浪属于一种强非线性的波体相互作用问题,现象十分复杂。近年来,甲板上浪导致的FPSO(浮式生产储运系统,Floating Production Storage Offloading)的船首甲板和上层建筑严重损坏事故时有发生,甲板上浪问题因此也越来越受到国内外研...甲板上浪属于一种强非线性的波体相互作用问题,现象十分复杂。近年来,甲板上浪导致的FPSO(浮式生产储运系统,Floating Production Storage Offloading)的船首甲板和上层建筑严重损坏事故时有发生,甲板上浪问题因此也越来越受到国内外研究人员的重视。文章回顾了关于甲板上浪问题研究的发展历程,介绍了国内外理论研究的最新进展,并对甲板上浪的研究趋势进行了展望。展开更多
文摘The influence of the second thermal cycle on coarse grained zone (CGHAZ) toughness of X70 steel is studied by weld thermal simulation test, scanning electron microscope and electron microprobe. The results show that the CGHAZ toughness is improved after the second thermal cycle but being heated during the intercritical HAZ (ICHAZ). The CGHAZ toughness decreases evidently after being heated during partially transformed zone, which chiefly results from the carbon segregation to the grain boundaries of primal austenite, thus forming high carbon martensite austenite (M A) constituent and bringing serious intercritically reheated coarse grain HAZ (IRCGHAZ) embrittlement.
文摘The relationship between the t8/5 and micro-hardness, impact toughness in the heat affected zone （HAZ） of ASME SA213-792 at peak temperature of 1 350 ℃ was studied by thermal simulation. The result shows that the micro-hardness of HAZ rises at the beginning and then decreases with increasing of t8/5 , whereas the impact toughness presents reverse trend. The distribution of precipitates in substrate has great influence on the impact toughness of HAZ. When the t8/5 is 40 s, chain-like precipitates lower the impact toughness of HAZ seriously.
文摘甲板上浪属于一种强非线性的波体相互作用问题,现象十分复杂。近年来,甲板上浪导致的FPSO(浮式生产储运系统,Floating Production Storage Offloading)的船首甲板和上层建筑严重损坏事故时有发生,甲板上浪问题因此也越来越受到国内外研究人员的重视。文章回顾了关于甲板上浪问题研究的发展历程,介绍了国内外理论研究的最新进展,并对甲板上浪的研究趋势进行了展望。
