Microstructure and defect of titanium alloy electron beam deep penetration welded joint

The microstructure, phase composition and cold shut defect of thick titanium alloy electron beam welded joint were studied. The results showed that the microstructure of weld zone was composed of α′ phase; the heat affected zone was divided into fine-grained zone and coarse-grained zone, the microstructure of fine-grained zone was primary α phase ＋ β phase ＋ equiaxed α phase, and the microstructure of coarse-grained zone was primary α phase ＋ acicular α′ phase; the microstructure of base metal zone basically consisted of primary α phase, and a small amount of residual β phase sprinkled. The forming. reason of cold shut was analyzed, and the precaution of cold shut was proposed.

中西历史文化语境中的“趣味”

“趣味”在中西不同的历史文化语境中显现某些相同的内涵特征以及不同的社会文化意义。在围绕趣味的文化阶层区隔过程中,中国体现了审美精神的道统化、强烈的审美共同体意识以及基于家族和文人群体的组织性,而这在西方则体现为不同的方式和样态。无论是在中国传统文化还是在西方文化发展过程中,趣味都逐渐形成生活与艺术融合的趋势,但在生活与艺术表现上呈现不同的面貌。中国近代以来,文化精英阶层经历由文人士大夫向现代知识分子的身份重塑过程,这一过程与中西趣味的观念融合是分不开的。当下我们重新审视中西趣味的内涵以及所产生的社会文化分层现象,既需要充分深入地理解西方趣味理论以及西方审美文化的演化历程,也需要面向中国传统趣味观念的审美自信,从美学的视角、美学的价值出发,思考中西趣味在社会文化上的融通路径。