Evaluation of straightening capacity of plate roll straightener

Straightening machine is widely used for improving the quality of the defective mild steel plates.In general,the capacity of straightening machine is affected by material properties,the initial shape of the incoming plate and the plastic ratio.The mechanics model describing the capacity of the machine was developed.The deviation of the straightening capacity curves was studied.Then,the presented model was evaluated by comparative study to filed production data.Finally,the influences of overstretch,straightening speed,strengthening coefficient,elastic modulus,width of the plate on the straightening capacity were studied.It is convenient to determine whether the plate can be straightened or not by a series of straightening capacity curves.The straightening speed,width of the plate and elastic modulus of the material are more sensitive to the straightening capacity than the strengthening coefficient.

Experience in the Treatment of Tumors by Replenishing Qi and Nourishing Blood,Detoxicating and Resolving Masses

The pathogenesis of malignant tumors is the deficiency of vital Qi and the excess of pathogenic Qi.Its basic treating principle is to strengthen vital Qi to eliminate pathogenic factor.The paper is to summarize the clinical experiences in tumor treatment of Dr.Chen Shizhou,a well-known traditional Chinese medicine expert in Weifang City,Shandong Province.He put forward the treatment method of"replenishing Qi and nourishing blood,detoxicating and resolving masses",paying attention to protecting stomach qi and advocating survival with tumor,with remarkable clinical effects.

Microstructural strengthening and toughening mechanisms in Fe-containing Ti-6Al-4V:A comparison between homogenization and aging treated states

Microalloying of Ti–6Al–4V alloy by Fe addition has attracted interest as a promising way to improve castability and comprehensive mechanical performance.The mission of this work is twofold by employing the experimental examination and the phenomenological analysis,(1)to investigate the effect of Fe addition on the microstructure features and mechanical properties of the Fe-containing Ti–6Al–4V(TC4-xF)alloys subjected to casting and homogenization treatment,and(2)to unveil the critical microstructure features in homogenization,hot-worked and aging treated alloys,respectively,that benefit the yield strength and the fracture toughness.Experimental observations evidence that the addition of 0.5 wt.%Fe is most effective in enhancing the tensile ductility and the modeⅠfracture toughness.Further Fe addition up to 0.7–0.9 wt.%results in plateau values of yield and ultimate strengths with some fluctuations.Phenomenological analyses screen out the microstructural strengthening and toughening determinants which exhibit distinct sensitivities on Fe content under different processing conditions.The solid solution strengthening is confirmed as the primary effect that governs the yield strength of the homogenization treated TC4-xF alloys,followed by the refined size of colony andαlamella,so does it for the hot-worked and the aging-treated alloys.The strengthening effect of Fe could be further promoted by hot-working but impaired by a prolonged annealing time or a lowered cooling rate.The type of crack propagation path and theαmorphology are discerned to play their own leading roles in different cases to influence the performance of fracture toughness.A long crack propagation distance that traverses broadα/βlamellae embraces a high crack propagation resistance and gives rise to enhanced fracture toughness.The experimental results enrich the dataset of microstructure features and mechanical properties of Ti–6Al–4V relevant alloys.While upon the phenomenological analysis,the discovered microstructural strengthening and toughening factors provide deeper mechanism insights into the mechanical behaviors of Fe-modified Ti-6Al-4V alloys and are of the technical importance to future machine-learning of microstructure-property relationship.