4.
Conclusions 结论  
The present work, aimed at studying the influence of carbon
on the simulated in-service properties of heat-treated high-chromium white cast irons, led to the following conclusions:  

l The 500 °C hot compression behaviour of heat-treated low-
and high-carbon white cast irons is excellent: their
strengths are very high and a significant  ductility was also
observed.                                                

l The wear resistance of high-chromium white cast irons is inversely proportional to the hardness of the product. The wear micromechanism
on both materials
takes   place by virtue of a strong plastic  deformation under compression, which ultimately leads to necking and final cracking  into small particles.                                                                     

l High-carbon white cast iron, with a higher volume fraction
of chromium  carbides has a higher strength and a lower ductility and is also more  wear-resistant than low-carbon
white cast iron.                                                                     

l Low-carbon white cast iron and specially high-carbon white
iron (higher  chromium content) hardly oxidize at 500 and 600 °C in still air. The good oxidation resistance of these alloys
is justified on account of their high-chromium content.