in recent years, two different kinds of rapid forming and manufacturing technologies have been developed, i. e. laser inducing thermal stress forming and rapid prototyping &manufacturing(rpm).
激光诱发热应力成形技术和激光快速成型技术是近年来发展起来的两种不同的激光快速成形与制造技术。
after repeated rapid quenching, the mechanical properties of the materials reduce greatly, that is due to crack resulted in by thermal stress forming and propagating.